Rule 144 notice: 6,500 MTZ shares reported sold

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Rule 144 notice reporting proposed and recent sales of 6,500 shares of Common stock.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Rule 144 notice reporting proposed and recent sales of 6,500 shares of Common stock. The filing lists multiple earlier grants tied to "Compensation for Past Services" and records $1,952,576.60 in proceeds tied to the recent sale activity.

Insights

Securities Counsel

TL;DR: Rule 144 notice for affiliate resale; transaction sizes and grant dates are listed.

The filing lists a proposed/actual resale of 6,500 shares and records $1,952,576.60 in proceeds for sales during the past three months. Multiple grant dates and share counts are included under "Compensation for Past Services."

All reported figures appear administrative: sales were reported under Rule 144. Cash‑flow treatment and any lockup/holding‑period detail are not stated in the excerpt; subsequent public disclosures would show settlement details if material.

Key Figures

Shares sold (past 3 months): 6,500 shares Proceeds recorded: $1,952,576.60 Header figure: 2,412,579.65 +4 more

7 metrics

Shares sold (past 3 months) 6,500 shares reported as sold during the past three months

Proceeds recorded $1,952,576.60 amount tied to the 6,500-share sale entry

Header figure 2,412,579.65 numeric value appearing in the filing header

Header figure 79,018,556 numeric value appearing in the filing header

Filing date 06/03/2026 date shown in the filing header

Example grant — 04/29/2015 2,964 shares listed as "Compensation for Past Services" grant date

Example grant — 02/13/2015 836 shares listed as "Compensation for Past Services" grant date

Key Terms

Rule 144, Compensation for Past Services, Securities To Be Sold

3 terms

Rule 144 regulatory

"filed as a Rule 144 notice reporting proposed sales"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Compensation for Past Services financial

"listed as the basis for multiple grants and share issuances"

Securities To Be Sold regulatory

"section heading listing grant dates and share counts"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for MTZ show?

The filing reports a proposed or completed sale of 6,500 shares of Common stock. It also lists multiple grant dates tied to "Compensation for Past Services" and shows $1,952,576.60 in proceeds associated with recent sales.

Who is the reporting party on this MTZ Form 144?

The excerpt lists Morgan Stanley Smith Barney LLC Executive Financial Services and an individual, Ernest N. Csiszar, as associated addresses. The filing identifies the broker and reporting names involved in the resale notice.

What grant dates and share counts are listed in the filing?

The filing itemizes multiple grants including 04/29/2015: 2,964 shares, 02/15/2012: 540 shares, 02/13/2015: 836 shares, among others. Each line is labeled "Compensation for Past Services."

Does the filing state how proceeds are treated or who receives them?

The excerpt does not specify the recipient treatment beyond listing proceeds. It records $1,952,576.60 tied to sales, but the filing text provided does not describe issuer versus seller proceeds allocation.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/03/2026 - 04:21 PM EDT Learn about SEC filing dates

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	0001341639
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MASTEC, INC.
SEC File Number	001-08106
Address of Issuer	800 S. Douglas Road, 12th Floor Coral Gables FLORIDA 33134
Phone	(305) 599-1800
Name of Person for Whose Account the Securities are To Be Sold	ERNEST N CSISZAR
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	Director

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	6500	2412579.65	79018556	06/03/2026	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	04/29/2015	Compensation for Past Services	Issuer			2964	04/29/2015	Services Rendered
Common	02/15/2012	Compensation for Past Services	Issuer			540	02/15/2012	Services Rendered
Common	02/13/2015	Compensation for Past Services	Issuer			836	02/13/2015	Services Rendered
Common	05/15/2025	Compensation for Past Services	Issuer			223	05/15/2025	Services Rendered
Common	08/15/2012	Compensation for Past Services	Issuer			627	08/15/2012	Services Rendered
Common	11/15/2011	Compensation for Past Services	Issuer			30	11/15/2011	Services Rendered
Common	08/14/2015	Compensation for Past Services	Issuer			996	08/14/2015	Services Rendered
Common	09/07/2011	Compensation for Past Services	Issuer			284	09/07/2011	Services Rendered

* 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
ERNEST N CSISZAR 800 S. Douglas Road, 12th Floor Coral Gables FL 33134	Common	03/03/2026	6500	1952576.60

144: Remarks and Signature

Remarks
Date of Notice	06/03/2026
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	/s/ Ernest N Csiszar
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)