Insider Notice: MasTec (MTZ) Plans Sale of 10,000 Common Shares

Rhea-AI Filing Summary

Form 144 notice for MasTec, Inc. (MTZ) indicating a proposed sale of 10,000 common shares through Merrill Lynch on 09/18/2025 with an aggregate market value of $2,000,000. The filing shows the issuer has 79,234,966 shares outstanding.

The securities to be sold were acquired as vested restricted shares: 1,073 shares on 03/19/2023 and 8,927 shares on 03/18/2024. A prior sale by the same person of 10,000 MasTec shares occurred on 07/16/2025 for gross proceeds of $1,749,500. The filer certifies no undisclosed material adverse information is known.

Positive

• Clear disclosure of broker, share counts, acquisition dates, and proposed sale date
• Prior sale in the filing shows recent transaction history (10,000 shares sold on 07/16/2025 for $1,749,500), improving transparency
• Shares originated from vested restricted stock, with acquisition dates provided (03/19/2023 and 03/18/2024)

Negative

• Limited issuer/filer identification in the provided content: filer CIK/CCC and contact details are not populated
• No context on rationale for the sale or relationship of the seller to issuer beyond listing the seller name in the past-sales table

Insights

Securities Analyst

TL;DR Insider proposes to sell 10,000 shares via Merrill Lynch; transaction appears routine and fully disclosed on Form 144.

The filing documents a proposed sale of 10,000 common shares valued at $2,000,000 scheduled for 09/18/2025 and identifies prior sales of 10,000 shares on 07/16/2025 for $1,749,500. Acquisition details show the shares originated as vested restricted stock (1,073 on 03/19/2023 and 8,927 on 03/18/2024). The disclosure meets Rule 144 reporting by showing broker, share counts, acquisition dates, and recent transactions. This is a compliance-focused filing rather than a change to company operations or financials.

Corporate Governance Expert

TL;DR The document is a routine insider sale notice that provides required transparency but does not signal a governance event.

The notice includes the broker name and address (Merrill Lynch), acquisition provenance (vested restricted shares from MasTec, Inc.), and a seller representation regarding material information. The presence of a recent prior sale (07/16/2025) is disclosed. From a governance perspective, the form documents adherence to disclosure obligations; it does not contain executive departures, policy changes, or other governance actions.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Merrill Lynch 333 S Hope Street 39th Floor Los Angeles CA 90071	10000	2000000	79234966	09/18/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/19/2023	Vested Restricted Shares	MasTec, Inc			1073	09/19/2025	Cash
Common	03/18/2024	Vested Restricted Shares	MasTec, Inc			8927	09/19/2025	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Robert E Apple CO MasTec, Inc 800 S Douglas Road 10th Floor Coral Gables FL 33134	MasTec, Inc	07/16/2025	10000	1749500

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for MasTec, Inc. (MTZ) report?

The form reports a proposed sale of 10,000 common shares via Merrill Lynch on 09/18/2025 with aggregate market value $2,000,000.

How many shares does MasTec have outstanding according to this filing?

The filing lists 79,234,966 shares outstanding for the issuer.

When were the shares being sold originally acquired?

They were acquired as vested restricted shares: 1,073 on 03/19/2023 and 8,927 on 03/18/2024.

Was there a recent sale by the same person prior to this proposed sale?

Yes. The filer sold 10,000 MasTec shares on 07/16/2025 for gross proceeds of $1,749,500.

Which broker is handling the proposed sale?

The broker named is Merrill Lynch at 333 S Hope Street, 39th Floor, Los Angeles, CA 90071.