0000015615-26-000074 | 11-K | XBRL Viewer

RELATED-PARTY TRANSACTIONS AND PARTY-IN-INTEREST TRANSACTIONS	12 Months Ended
Dec. 31, 2025
EBP 002
EBP, Related Party and Party-in-Interest Transactions [Line Items]
RELATED-PARTY TRANSACTIONS AND PARTY-IN-INTEREST TRANSACTIONS	RELATED-PARTY TRANSACTIONS AND PARTY-IN-INTEREST TRANSACTIONS Certain Plan investments are managed by the Plan's recordkeeper. Effective October 1, 2025, the Plan's trustee and recordkeeper changed from Merrill Lynch to Schwab. Both Merrill Lynch and Schwab served as trustee and recordkeeper for portions of the plan year and, therefore, transactions with each qualify as party-in-interest transactions. Fees paid by the Plan for investment management services amounted to $1,057,576 for the year ended December 31, 2025. The Plan holds shares of MasTec, Inc. common stock, 1,112,226 and 1,134,486 shares as of December 31, 2025 and 2024, respectively, and recorded net realized gains on sales, $87,938,512 and $5,334,259 during 2025 and 2024, respectively, and net unrealized appreciation in value of these securities, $5,778,538 and $65,162,850 during 2025 and 2024, respectively. During the year ended December 31, 2025 purchases and sales of MasTec, Inc. commons stock were $29,791,477 and $182,870,389, respectively. The Plan invests in the common stock of MasTec, Inc., the plan sponsor. The fair market value of the MasTec, Inc. common stock at December 31, 2025 and 2024 was $241,764,546 and $154,448,893, respectively. Notes receivable from participants also qualify as exempt party-in-interest transactions.

RISKS AND UNCERTAINTIES	12 Months Ended
Dec. 31, 2025
EBP 002
EBP, Risk and Uncertainty [Line Items]
RISKS AND UNCERTAINTIES	RISKS AND UNCERTAINTIES The Plan invests in various investment securities. Investment securities are exposed to various risks, such as interest rate, market and credit risk. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that these risks in the near term would materially affect participants’ account balances and the amounts reported in the statements of net assets available for benefits.

SCHEDULE H, LINE 4i- SCHEDULE OF ASSETS (HELD AT END OF YEAR)

12 Months Ended

Dec. 31, 2025

EBP 002

EBP, Schedule of Asset Held for Investment [Line Items]

SCHEDULE H, LINE 4i- SCHEDULE OF ASSETS (HELD AT END OF YEAR)

The MasTec, Inc.

401(k) Retirement Plan

Employer Identification Number 65-0829355

Plan # 002

SCHEDULE H, LINE 4i-

SCHEDULE OF ASSETS (HELD AT END OF YEAR)

December 31, 2025

(a)

(b)

(c)

(d)

(e)

Identity of Issuer, Borrower, Lessor or Similar Party

Description of Investment Including
Maturity Date, Rate of Interest, Par
or Maturity Value

Cost **

Current Value

Investment Contract #115790 with Charles Schwab Trust Bank :

BlackRock Total Return Fund K

Mutual Fund

107,513,900

MFS Growth Fund R6

Mutual Fund

66,942,522

iShares S&P 500 Index Fund Class K

Mutual Fund

60,126,191

Columbia Dividend Income Institutional 3 Class

Mutual Fund

51,930,532

Baird Short Term Bond

Mutual Fund

51,525,089

BlackRock T-Fund Premier Class

Money Market

42,026,459

Janus Henderson Enterprise Fund Class N

Mutual Fund

28,221,790

BlackRock Inflation Protected Fund Class K

Mutual Fund

28,109,311

Causeway International Value

Mutual Fund

26,278,599

MFS International Growth R6

Mutual Fund

25,464,636

Fidelity Low Priced Stock Fund K6

Mutual Fund

25,457,204

Seafarer Overseas Growth

Mutual Fund

17,940,693

Undiscovered Managers Behavioral Value Fund Class R6

Mutual Fund

17,616,250

PGIM High Yiel Fund R6

Mutual Fund

17,603,376

MFS International Diversification Fund R6

Mutual Fund

16,120,590

Invesco Discovery Fund Class R6

Mutual Fund

12,216,505

PIMCO Commodity Real Return Strategy Fund Class I

Mutual Fund

11,007,392

T Rowe Price Dividend Growth Fund

Mutual Fund

9,104,698

Principal Real Estate SEC R6

Mutual Fund

9,045,920

Vanguard Total International Stock Index Fund Admiral Class

Mutual Fund

8,935,777

Vanguard Total Bond Market Index Fund Admiral Class

Mutual Fund

6,503,762

Fidelity Freedom Index Target Date Series

Mutual Fund

4,674,035

PIMCO Foreign Bond Fund (US Dollar-Hedged) Institutional Class

Mutual Fund

1,695,094

Vanguard Treasury Money Market Fund

Mutual Fund

600

MasTec, Inc. Stock

Common stock

241,764,546

Notes Receivable from participants

Interest rates range from 4.25% to 9.50%

20,260,287

Total

908,085,758

* Represents a party-in-interest as defined by ERISA

** The cost of participant-directed investments is not required to be disclosed.

SCHEDULE H, LINE 4a- SCHEDULE OF DELINQUENT DEPOSITS OF PARTICIPANT CONTRIBUTIONS (Details) - EBP 002 - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Schedule of Delinquent Participant Contribution [Line Items]
Entity tax identification number	65-0829355
Plan number	002
Transferred late to plan	$ 12,631	$ 2,994
Contributions Not Corrected	143	0
Contributions Corrected Outside VFCP*	12,631	2,994
Contributions Pending Correction in VFCP*	0	0
Total Fully Corrected Under VFCP* and PTE** 2002-51	$ 0	$ 0

- Definition

Plan number of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), in three-digit numeric format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule II))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (3)
-Publisher DOL-EBSA

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (4)
-Publisher DOL-EBSA

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (2)
-Publisher DOL-EBSA

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (2)
-Publisher DOL-EBSA

+ Details

PLAN TERMINATION	12 Months Ended
Dec. 31, 2025
EBP 002
EBP, Schedule of Allocation, Income and Change in Plan Equity [Line Items]
PLAN TERMINATION	PLAN TERMINATION Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of Plan termination, participants would become 100 percent vested in their employer contributions.

NON-EXEMPT TRANSACTIONS (Details) - EBP 002 - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP, Schedule of Reportable Transaction [Line Items]
Transferred late to plan	$ 12,631	$ 2,994
Employee withholdings, interest accrued	$ 142	$ 577

FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2025

EBP 002

EBP, Investment, Fair Value and NAV [Line Items]

EBP, Investment, Fair Value and NAV

he following tables set forth by level within the fair value hierarchy individual investments that represent the Plan’s net assets as of December 31, 2025 and 2024:


Investments in the fair value hierarchy: (a)	December 31,
	2025		2024
Mutual funds	$	604,034,466	$	516,591,992
MasTec, Inc. common stock	$	241,764,546	$	154,448,893
Money market funds	$	42,026,459	$	10,268,513
	$	887,825,471	$	681,309,398


Investments measured at net asset value: (b)

Stable value funds	$	—	$	28,720,117
	$	—	$	28,720,117

(a)Mutual funds, MasTec, Inc. common stock and money market funds have been classified within Level 1 of the fair value hierarchy. MasTec, Inc. stock is valued at its quoted price on the last business day of the Plan year.

(b)In accordance with Subtopic 820-10, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the line items presented in the statements of the net assets available for benefits.

As of December 31, 2025, the Plan held no investments measured using net asset value per share as a practical expedient.

December 31, 2024

Fair Value

Unfunded
Commitments

Redemption
Frequency
(If Currently
Eligible)

Redemption
Notice
Period

Stable value funds

28,720,117

N/A

Daily

Annually

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 14: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 16: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (k)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 17: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 18: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 19: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 20: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 21: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-02(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

- Definition

Tabular disclosure of fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

+ Details

Statements of Net Assets Available for Benefits - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Assets
Investments, at fair value	$ 887,825,471	$ 710,029,515
Receivables:
Employer contributions	9,478,858	8,837,536
Participant contributions	35,449	413,925
Notes receivable from participants	20,260,287	16,765,691
Due from Broker	10,913	0
Total Receivables	29,785,507	26,017,152
Total Assets	917,610,978	736,046,667
Liabilities
Due to Broker	0	301,664
Total Liabilities	0	301,664
Net assets available for benefits	$ 917,610,978	$ 735,745,003

DESCRIPTION OF PLAN	12 Months Ended
DESCRIPTION OF PLAN	Dec. 31, 2025
EBP 002
EBP, Description of Plan [Line Items]
DESCRIPTION OF PLAN	DESCRIPTION OF PLAN Description of the Plan The following description of The MasTec, Inc. 401(k) Retirement Plan (the “Plan”), as amended, provides only general information. Participants should refer to the Plan Document for a more complete description of the Plan’s provisions. General The Plan is a defined contribution plan covering all eligible employees of MasTec, Inc. and its subsidiaries that elect to participate in the Plan (collectively, the “Company”) who have completed at least one (1) full calendar month of employment. Employees enter the Plan on the first day of the month coinciding with or the next month following the date on which they meet the eligibility requirements. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended. Effective October 1, 2025, the Plan’s trustee, custodian and recordkeeper was changed from Bank of America Merrill Lynch (“Merrill Lynch”) to Schwab Retirement Plan Services, Inc. and Charles Schwab Trust Bank, respectively (collectively, “Schwab”). In connection with this change, plan assets totaling approximately $884,820,204, including $19,331,614 of notes receivables from participants, were transferred from Merrill Lynch to Schwab. A blackout period was in effect from September 22, 2025 to October 23, 2025 during which participants were temporarily unable to direct investments, request loans or take distributions from the Plan. The Investment Committee is responsible for oversight of the Plan and determines the appropriateness of the Plan’s investment offerings and monitors investment performance. Contributions The Plan has a Safe Harbor match, which provides for a match of 100 percent of a participant’s salary deferrals that do not exceed 3 percent of the participant’s compensation plus 50 percent of a participant’s salary deferral between 3 percent and 5 percent of the participant’s compensation. The match is credited on a quarterly basis, in the months of April, July, October of the current year, and January of the following year. The Company’s matching contribution is funded 50 percent in the form of the Company’s common stock, and 50 percent in cash, which is invested in accordance with each participant’s investment directive. The Company’s Safe Harbor matching contributions are vested immediately. Participants can change their investment options with respect to the matching contributions made in the form of the Company’s common stock as soon as the matching contribution is funded, subject to the terms of the Plan. The Plan also allows for a discretionary profit sharing contribution. Contributions from participants are recorded when payroll deductions are made. The Plan is required to return contributions received during the Plan year in excess of the Internal Revenue Service (“IRS”) limits. Subject to the terms of the Plan, participants may also contribute amounts representing distributions from other qualified defined benefit or defined contribution plans. Participants who have attained age 50 during the calendar year are eligible to make catch-up contributions to the Plan. Upon enrollment, a participant may direct employee contributions, in 1 percent increments, into various investment options offered by the Plan. Participants may change their investment options daily. Effective January 1, 2025, the Plan adopted the optional provisions of Section 109 of the SECURE 2.0 Act of 2022, which increases the catch-up contribution limit for participants who attain ages 60 through 63 during the calendar year to the greater of $10,000 or 150% of the regular catch-up contribution limit. For the year ended December 31, 2025, this enhanced catch-up contribution limit was $11,250. Participants’ Accounts Each participant’s account is credited with the participant’s contributions and Company’s matching contributions, as well as allocations of Plan’s earnings. Participant accounts are charged with an allocation of administrative expenses that are paid by the Plan. Allocations are based on participant earnings, account balances, or specific participant transactions, as defined in the Plan. Loan and distribution expenses are charged directly to the respective participant. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account. Vesting Participants vest immediately in their contributions plus actual earnings thereon and amounts rolled over into the Plan. In addition, all Safe Harbor matching contributions vest immediately. Vested interested on a profit sharing contribution account is determined by the following schedule, based on the years of service. 1 year of Vesting Service .............. 33.00% Vested 2 years of Vesting Service ............. 66.00% Vested 3 years of Vesting Service ........... 100.00% Vested Forfeitures Forfeitures of participant account balances are allocated to the general funds of the Plan and can be used to pay administrative expenses of the Plan and to reduce contributions otherwise required of the Company. Any remaining forfeitures shall be allocated to participants. At December 31, 2025 there were no unallocated forfeited accounts. At December 31, 2024, unallocated forfeited accounts totaled $46,075. The Company has elected to use the forfeitures to reduce employer contributions. During the year ended December 31, 2025, no forfeitures were used to pay administrative fees. During the year ended December 31, 2024, $14,525 of forfeitures were used to reduce employer contributions. Notes Receivable from Participants Notes receivable from participants consist of participant loans that are secured by the balance in the participant’s account. Each participant may have only one loan outstanding at any given time. The Plan’s loan feature allows participants to borrow up to a maximum equal to the lesser of $50,000 or 50 percent of their vested account balance. The loans bear interest at the published prime rate in the Wall Street Journal plus 1 percent, at the date of the loan. The annual interest rate charged on participant loans outstanding during the year ended December 31, 2025 ranged from 4.25 percent to 9.50 percent. Loan terms range from 1 to 5 years or may exceed 5 years for the purchase of a primary residence. Loans provide level amortization for repayments to be made not less frequently than on a quarterly basis. For participants receiving pay from the Company, principal and interest is paid ratably through payroll deductions. For Participants who have separated from service or are on unpaid leave, principal and interest may be paid via direct debit origination or by remitting a check directly to the Company. Participants pay certain administrative expenses associated with the loan. If any scheduled loan repayments remain outstanding beyond the last day of the calendar quarter following the calendar quarter in which the last payment was due, the participant loan will be placed in default and reported as deemed distribution. Payment of Benefits Participants may receive a distribution of the vested portion of their accounts under the Plan for the following reasons: (i) termination of employment for reasons other than death, disability or retirement, (ii) normal retirement, (iii) disability, or (iv) death. In addition, participants may be eligible to receive distributions while still employed with the Company under certain limited circumstances. Distributions are generally paid in a single lump-sum payment or in substantially equal installments.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) - EBP 002	12 Months Ended
	Dec. 31, 2025
EBP, Accounting Policy [Line Items]
Basis of Presentation	Basis of Presentation The financial statements of the Plan are prepared on the accrual basis of accounting, in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”).
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.
Investment Valuation and Income Recognition	Investment Valuation and Income Recognition Investments are reported at fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note C for discussion of fair value measurements. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation includes the Plan’s gains and losses on investment bought and sold as well as held during the year.
Contributions Receivable	Contributions Receivable Participant contributions and any related employer matching contributions are recognized in the period during which the Company makes the respective payroll deduction from the participant’s compensation. Profit sharing contributions are recorded in the relevant period in accordance with the terms of the Plan document.
Note Receivable from Participants	Notes Receivable from Participants Notes receivable from participants are measured at their unpaid principal balance plus any accrued unpaid interest. Related fees are recorded as administrative expenses and are expensed when they are incurred.
Administrative Expenses	Administrative Expenses All administrative expenses of the Plan are chargeable to the Plan as allowed under ERISA. The Company may, at its sole discretion, pay any such expenses, in whole or in part. Expenses that are paid by the Company are excluded from these financial statements.
Benefit Payments	Benefit Payments Benefits are recorded when paid.

- Definition

Disclosure of accounting policy for use of estimate in preparation of financial statement of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References + Details

RELATED-PARTY TRANSACTIONS AND PARTY-IN-INTEREST TRANSACTIONS (Details) - EBP 002 - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Administrative expenses	$ 1,057,576
Investments, at fair value	$ 887,825,471	$ 710,029,515
MasTec, Inc. common stock
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Number of shares (in shares)	1,112,226	1,134,486
Net realized gains on sales	$ 87,938,512	$ 5,334,259
Net unrealized appreciation in value on securities	5,778,538	65,162,850
Investment acquired, excluding plan interest in master trust, cost	29,791,477
Investment sold, excluding plan interest in master trust, cost	182,870,389
Investments, at fair value	241,764,546	$ 154,448,893
EBP, Trustee
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Administrative expenses	$ 1,057,576

FAIR VALUE MEASUREMENT

12 Months Ended

Dec. 31, 2025

EBP 002

EBP, Investment, Fair Value and NAV [Line Items]

FAIR VALUE MEASUREMENT

The framework for measuring fair value provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy under FASB ASC 820 are described as follows:

Level 1:Inputs to the valuation methodology are unadjusted quoted prices in active markets for identical assets or liabilities that the Plan has the ability to access at measurement date.

Level 2:Inputs to the valuation methodology include:

a.Quoted prices for similar assets or liabilities in active markets

b.Quoted prices for identical or similar assets or liabilities in inactive markets

c.Inputs other than quoted prices that are observable for the asset or liability

d.Inputs that are derived principally from or corroborated by observable market data by correlation or other means

If the asset or liability has a specified (contractual) term, the Level 2 input must be observable for substantially the full term of the assets or liability.

Level 3:Inputs to the valuation methodology are unobservable and significant to the fair value measurement.

The asset or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

Asset Valuation Techniques:

Valuation techniques maximize the use of relevant observable inputs and minimize the use of unobservable inputs. The following is a description of the valuation methodologies used for assets measured at fair value.

Common stock — Valued at the closing price reported on the active market on which the individual securities are traded.

Money market funds — Valued at the daily closing price as reported by the fund.

Mutual funds — Valued at the daily closing price as reported by the fund. Mutual funds held by the Plan are open-ended mutual funds that are registered with the Securities and Exchange Commission (“SEC”). These funds are required to publish their daily net asset value (“NAV”) and to transact at that price. The mutual funds held by the Plan are deemed to be actively traded.

Prior to October 1, 2025, the Plan offered a stable value fund composed primarily of fully benefit-responsive investment contracts that was reported at fair value using NAV as a practical expedient. The stable value fund calculated NAV per share in a manner consistent with the measurement principles in FASB Accounting Standards Codification Topic 946 Financial Services — Investment Companies. Those measurement principles indicate that, in the determination of a stable value fund's NAV, the relevant measurement is net assets which include the fully benefit-responsive investment contracts held by the fund at contract value. This NAV represented the Plan's fair value since this was the NAV at which the Plan transacted with the fund. This practical expedient was not used when it was determined to be probable that the fund would sell the investment for an amount different than the reported net asset value. Participant transactions (purchases and sales) could occur daily. If the Plan initiated a full redemption of the collective trust, the issuer reserved the right to require 12 months' notification in order to ensure that securities liquidations would be carried out in an orderly business manner.

In connection with the Plan's change in recordkeeper from Merrill Lynch to Schwab, the stable value fund was liquidated during September 2025. Participant balances were transferred at contract value to BlackRock Liquidity T-Fund. No market value adjustment was applied to participant balances. As of December 31, 2025, the Plan held no fully benefit-responsive investment contracts.

The following tables set forth by level within the fair value hierarchy individual investments that represent the Plan’s net assets as of December 31, 2025 and 2024:


Investments in the fair value hierarchy: (a)	December 31,
	2025		2024
Mutual funds	$	604,034,466	$	516,591,992
MasTec, Inc. common stock	$	241,764,546	$	154,448,893
Money market funds	$	42,026,459	$	10,268,513
	$	887,825,471	$	681,309,398


Investments measured at net asset value: (b)

Stable value funds	$	—	$	28,720,117
	$	—	$	28,720,117

Investments Measured Using the Net Asset Value per Share:

As of December 31, 2025, the Plan held no investments measured using net asset value per share as a practical expedient.

December 31, 2024

Fair Value

Unfunded
Commitments

Redemption
Frequency
(If Currently
Eligible)

Redemption
Notice
Period

Stable value funds

28,720,117

N/A

Daily

Annually

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

The entire disclosure for fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(3)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-02(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 16: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-23

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-6

+ Details

Statement of Changes in Net Assets Available for Benefits - EBP 002	12 Months Ended
	Dec. 31, 2025 USD ($)
Investment income:
Net appreciation in fair value of investments	$ 134,121,398
Dividends	33,669,153
Total investment income	167,790,551
Interest income on notes receivable from plan participants	1,424,483
Contributions:
Participants	74,705,929
Employer	38,208,433
Rollovers	7,721,294
Total contributions	120,635,656
Total additions	289,850,690
Deductions to net assets available for benefits attributed to:
Benefits paid to participants	106,927,139
Administrative expenses	1,057,576
Total deductions	107,984,715
Net increase in net assets available for benefits	181,865,975
Net assets available for benefits at beginning of year	735,745,003
Net assets available for benefits at end of year	$ 917,610,978

SCHEDULE H, LINE 4i- SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - EBP 002	12 Months Ended
	Dec. 31, 2025 USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	65-0829355
Plan number	002
Participant loan, cost	$ 0
Current Value	20,260,287
Total	$ 908,085,758
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Asset held for investment, participant loan, interest rate	4.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Asset held for investment, participant loan, interest rate	9.50%
Investment, Identifier [Axis]: Baird Short Term Bond \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	$ 51,525,089
Investment, Identifier [Axis]: BlackRock Inflation Protected Fund Class K \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	28,109,311
Investment, Identifier [Axis]: BlackRock T-Fund Premier Class \| Money Market
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	42,026,459
Investment, Identifier [Axis]: BlackRock Total Return Fund K \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	107,513,900
Investment, Identifier [Axis]: Causeway International Value \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	26,278,599
Investment, Identifier [Axis]: Columbia Dividend Income Institutional 3 Class \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	51,930,532
Investment, Identifier [Axis]: Fidelity Freedom Index Target Date Series \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	4,674,035
Investment, Identifier [Axis]: Fidelity Low Priced Stock Fund K6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	25,457,204
Investment, Identifier [Axis]: Invesco Discovery Fund Class R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	12,216,505
Investment, Identifier [Axis]: Janus Henderson Enterprise Fund Class N \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	28,221,790
Investment, Identifier [Axis]: MFS Growth Fund R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	66,942,522
Investment, Identifier [Axis]: MFS International Diversification Fund R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	16,120,590
Investment, Identifier [Axis]: MFS International Growth R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	25,464,636
Investment, Identifier [Axis]: MasTec, Inc. Stock \| Common stock
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	241,764,546
Investment, Identifier [Axis]: PGIM High Yiel Fund R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	17,603,376
Investment, Identifier [Axis]: PIMCO Commodity Real Return Strategy Fund Class I \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	11,007,392
Investment, Identifier [Axis]: PIMCO Foreign Bond Fund (US Dollar-Hedged) Institutional Class \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	1,695,094
Investment, Identifier [Axis]: Principal Real Estate SEC R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	9,045,920
Investment, Identifier [Axis]: Seafarer Overseas Growth \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	17,940,693
Investment, Identifier [Axis]: T Rowe Price Dividend Growth Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	9,104,698
Investment, Identifier [Axis]: Undiscovered Managers Behavioral Value Fund Class R6 \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	17,616,250
Investment, Identifier [Axis]: Vanguard Total Bond Market Index Fund Admiral Class \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	6,503,762
Investment, Identifier [Axis]: Vanguard Total International Stock Index Fund Admiral Class \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	8,935,777
Investment, Identifier [Axis]: Vanguard Treasury Money Market Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	600
Investment, Identifier [Axis]: iShares S&P 500 Index Fund Class K \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current Value	$ 60,126,191

DESCRIPTION OF PLAN - Narrative (Details)	3 Months Ended	12 Months Ended
DESCRIPTION OF PLAN - Narrative (Details)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) yr	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Participant catch-up contribution, minimum age \| yr		50
EBP 002
EBP, Description of Plan [Line Items]
Requisite service period		1 month
Notes receivable, amount transferred to (from) plan	$ 19,331,614
Matching percentage funding, common stock		50.00%
Matching percentage funding, cash		50.00%
Participant catch-up contribution, increase rate		1.00%
Forfeited nonvested account	0	$ 0	$ 46,075
Forfeited nonvested account, decrease from administrative expense		0
Forfeited nonvested account, decrease from employer contribution			$ 14,525
Receivable from participant, account, maximum borrowing, amount	$ 50,000	$ 50,000
Note receivable from participant, account, maximum borrowing, to total account, percentage	50.00%	50.00%
Participant loan, basis spread on variable rate		1.00%
Note receivable from participant, general loan, minimum borrowing term		1 year
Note receivable from participant, general loan, maximum borrowing term		5 years
Note receivable from participant, account, primary residence, maximum borrowing term		5 years
EBP 002 \| EBP, Nonparticipant-Directed
EBP, Description of Plan [Line Items]
Change in net asset available for benefit, transfer to (from) plan		$ 884,820,204
EBP 002 \| Minimum
EBP, Description of Plan [Line Items]
Asset held for investment, participant loan, interest rate		4.25%
EBP 002 \| Maximum
EBP, Description of Plan [Line Items]
Asset held for investment, participant loan, interest rate		9.50%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2025
EBP 002
EBP, Accounting Policy [Line Items]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The financial statements of the Plan are prepared on the accrual basis of accounting, in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Investment Valuation and Income Recognition Investments are reported at fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note C for discussion of fair value measurements. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation includes the Plan’s gains and losses on investment bought and sold as well as held during the year. Contributions Receivable Participant contributions and any related employer matching contributions are recognized in the period during which the Company makes the respective payroll deduction from the participant’s compensation. Profit sharing contributions are recorded in the relevant period in accordance with the terms of the Plan document. Notes Receivable from Participants Notes receivable from participants are measured at their unpaid principal balance plus any accrued unpaid interest. Related fees are recorded as administrative expenses and are expensed when they are incurred. Administrative Expenses All administrative expenses of the Plan are chargeable to the Plan as allowed under ERISA. The Company may, at its sole discretion, pay any such expenses, in whole or in part. Expenses that are paid by the Company are excluded from these financial statements. Benefit Payments Benefits are recorded when paid. At December 31, 2025 and 2024, there were $1,736,420 and $129,520, respectively, allocated to accounts of persons who had elected to withdraw from the Plan, but had not been paid.

FAIR VALUE MEASUREMENT - Fair Value Hierarchy Individual Investments (Details) - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 887,825,471	$ 710,029,515
Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	887,825,471	681,309,398
Fair Value Measured at Net Asset Value Per Share
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	28,720,117
Mutual funds \| Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	604,034,466	516,591,992
MasTec, Inc. common stock
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	241,764,546	154,448,893
MasTec, Inc. common stock \| Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	241,764,546	154,448,893
Money market funds \| Fair Value, Inputs, Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 42,026,459	$ 10,268,513

- Definition

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4K
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 12: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 16: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 17: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (k)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 18: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 19: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 20: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 21: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

Reference 22: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477509/962-325-45-5

+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	MasTec, Inc.
Amendment Flag	false
Entity Central Index Key	0000015615
EBP 002
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	MasTec, Inc.
Amendment Flag	false
Entity Central Index Key	0000015615

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2025
EBP 002
EBP, Subsequent Event [Line Items]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS Effective January 1, 2026, in accordance with Section 603 of the SECURE 2.0 Act of 2022, the Plan requires that catch-up contributions made by participants whose prior-year FICA wages exceeded $150,000 be designated as Roth (after-tax) contributions. Participants not meeting this wage threshold may continue to make catch-up contributions on either a pre-tax or Roth basis. The Plan evaluated subsequent events through June 26, 2026, the date the financial statements were available to be issued.

TAX STATUS	12 Months Ended
TAX STATUS	Dec. 31, 2025
EBP 002
EBP, Tax Status [Line Items]
TAX STATUS	TAX STATUS The Company adopted a Pre-Approved Defined Contribution Plan document from Schwab and the Plan is subject to a favorable IRS opinion letter dated September 21, 2020, indicating that the Plan and related trust are designed in accordance with applicable sections of the Internal Revenue Code (“IRC”). The Plan administrator believes that the Plan is designed, and is currently being operated, in compliance with the applicable requirements of the IRC and, therefore, believes that the Plan is qualified, and the related trust is tax-exempt. Accounting principles generally accepted in the United States of America require plan management to evaluate tax positions taken by the plan and recognize a tax liability if the plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

Employee Benefit Plan, Description of Plan (Tables)	12 Months Ended
Employee Benefit Plan, Description of Plan (Tables)	Dec. 31, 2025
EBP 002
EBP, Description of Plan [Line Items]
EBP, Vesting	Vested interested on a profit sharing contribution account is determined by the following schedule, based on the years of service. 1 year of Vesting Service .............. 33.00% Vested 2 years of Vesting Service ............. 66.00% Vested 3 years of Vesting Service ........... 100.00% Vested

DESCRIPTION OF PLAN - Vesting (Details) - EBP 002	12 Months Ended
DESCRIPTION OF PLAN - Vesting (Details) - EBP 002	Dec. 31, 2025
1 year of Vesting Service
EBP, Description of Plan [Line Items]
Vesting service period	1 year
Vesting percentage	33.00%
2 Years Of Vesting Service
EBP, Description of Plan [Line Items]
Vesting service period	2 years
Vesting percentage	66.00%
3 Years Of Vesting Service
EBP, Description of Plan [Line Items]
Vesting service period	3 years
Vesting percentage	100.00%

PLAN TERMINATION (Details)	12 Months Ended
PLAN TERMINATION (Details)	Dec. 31, 2025
EBP 002
EBP, Schedule of Allocation, Income and Change in Plan Equity [Line Items]
Plan termination, employer contribution, vesting percentage	100.00%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP 002
EBP, Accounting Policy [Line Items]
Liability to participant	$ 1,736,420	$ 129,520

NON-EXEMPT TRANSACTIONS	12 Months Ended
NON-EXEMPT TRANSACTIONS	Dec. 31, 2025
EBP 002
EBP, Schedule of Reportable Transaction [Line Items]
NON-EXEMPT TRANSACTIONS	NON-EXEMPT TRANSACTIONS During the Plan years ended December 31, 2025 and 2024, employee withholdings in the amounts of $12,631 and $2,994, respectively, were not remitted within the appropriate time period by the Company. These transactions constitute prohibited transactions as defined by ERISA. The Company is aware of the occurrence and has taken the appropriate steps to correct the situation. Estimated interest assessed on these amounts were $142 and $577, for the years ended December 31, 2025 and 2024, respectively. The lost earnings were remitted to the Plan during 2025 and 2026.The Company has chosen to correct this without use of the Voluntary Fiduciary Contribution Program. Furthermore, the Company does not believe that these prohibited transactions will have a material impact on the accompanying financial statements and supplemental schedules.