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Who

Ernst N. Csiszar

Director

Company insider

Files Form 4 as: Director, MasTec.

Every Form 4 they filed

In numbers

Trades disclosed
168
Buys
0
Sells
10
Bought
$0
Sold
$11.1M
Companies
1
Companies where not an officer
1
First trade
18 May 2006
Last trade
14 Aug 2026
Last filed
18 Aug 2026

Companies traded

Everywhere else they filed: board seats, 10% stakes, other companies
MTZ MasTecDirector · Engineering & Construction · last 14 Aug 20260 buys · 10 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
10Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
14 Aug 2026filed 18 Aug 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—152 at $0.00filing
14 Aug 2026filed 18 Aug 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$10K34 at $297.59filing
14 Aug 2026filed 18 Aug 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—152 at $0.00filing
14 Aug 2026filed 18 Aug 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$10K34 at $297.59filing
3 Jun 2026filed 5 Jun 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Sold$2.4M6,500 at $371.17filing
3 Jun 2026filed 5 Jun 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Sold$2.4M6,500 at $371.17filing
15 May 2026filed 19 May 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—104 at $0.00filing
15 May 2026filed 19 May 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$10,00023 at $434.77filing
15 May 2026filed 19 May 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—104 at $0.00filing
15 May 2026filed 19 May 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$10,00023 at $434.77filing
3 Mar 2026filed 5 Mar 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Sold$2.0M6,500 at $300.40filing
3 Mar 2026filed 5 Mar 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Sold$2.0M6,500 at $300.40filing
13 Feb 2026filed 18 Feb 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—168 at $0.00filing
13 Feb 2026filed 18 Feb 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$9,97337 at $269.53filing
13 Feb 2026filed 18 Feb 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—168 at $0.00filing
13 Feb 2026filed 18 Feb 2026MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$9,97337 at $269.53filing
14 Nov 2025filed 18 Nov 2025MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—235 at $0.00filing
14 Nov 2025filed 18 Nov 2025MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$9,99552 at $192.22filing
15 Aug 2025filed 19 Aug 2025MTZ MasTecEngineering & ConstructionSEC FORM 4 Code A—254 at $0.00filing
15 Aug 2025filed 19 Aug 2025MTZ MasTecEngineering & ConstructionSEC FORM 4 Code F$9,96856 at $178.00filing

News

JPMorgan Chase & Co. Has Lowered Expectations for MasTec (NYSE:MTZ) Stock PriceMTZ · dailypolitical.com · 19 Oct 2026Jim Cramer Weighs MasTec's (MTZ) Business Against the Selling PressureMTZ · insidermonkey.com · 10 Oct 2026

0 headlines in the last 90 days name Ernst N. Csiszar; 2 articles from the last 14 days about the 1 company they traded most, at most three about any one of them.

Sectors

Industrials10

Buys in green, sells in red, by the company’s sector.

Related people

Alex SpiroDirector · Director at Mastec, filing Form 4 there in the last year
Ava L. ParkerDirector · Director at Mastec, filing Form 4 there in the last year
Julia L. JohnsonDirector · Director at Mastec, filing Form 4 there in the last year
Manuel Benito MirandaDirector · Director at Mastec, filing Form 4 there in the last year
Robert J. DwyerDirector · Director at Mastec, filing Form 4 there in the last year
Thomas H. Kean, Jr.Representative, NJ-07 · Also traded MTZ in the last 90 days