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Who

Mark Zagorski

Chief Executive Officer

Company insider

Files Form 4 as: Chief Executive Officer, DoubleVerify Holdings; Director, Teads Holding Co; Chief Executive Officer, Telaria; President & COO, Magnite.

In numbers

Trades disclosed
321
Buys
9
Sells
0
Bought
$747K
Sold
$0
Companies
4
Companies where not an officer
1
First trade
10 Jul 2017
Last trade
30 Sep 2026
Last filed
2 Oct 2026

Companies traded

Where they are an officer
DV DoubleVerify HoldingsDirector, Officer · IT Services & Consulting · last 30 Sep 20267 buys · 0 sells
TelariaDirector, Officer · last 1 Apr 20202 buys · 0 sells
MGNI MagniteOfficer · IT Services & Consulting · last 1 Apr 20200 buys · 0 sells
Everywhere else they filed: board seats, 10% stakes, other companies
TEAD Teads Holding CoDirector · IT Services & Consulting · last 13 May 20260 buys · 0 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
01Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
30 Sep 2026filed 2 Oct 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code M—13,476 at $0.00filing
30 Sep 2026filed 2 Oct 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code F$93K6,880 at $13.49filing
30 Sep 2026filed 2 Oct 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—13,476 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code M—22,919 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code F$54K3,983 at $13.50filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—22,919 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—12,122 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—15,219 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—2,757 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—7,802 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—9,375 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code F$158K11,701 at $13.50filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code M—12,122 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—22,919 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—12,122 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—15,219 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—2,757 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—7,802 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify Holdingsoption or derivative · IT Services & ConsultingSEC FORM 4 Code M—9,375 at $0.00filing
15 Sep 2026filed 17 Sep 2026DV DoubleVerify HoldingsIT Services & ConsultingSEC FORM 4 Code F$84K6,189 at $13.50filing

News

No headline names them, or the companies they trade most, lately.

Sectors

Technology7
Not placed2

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

Related people

Paul CaineDirector · Director at Magnite, filing Form 4 there in the last year
Haas SullivanChief Accounting Officer · Chief Accounting Officer at Magnite, filing Form 4 there in the last year
Brian GephartChief Financial Officer · Chief Financial Officer at Magnite, filing Form 4 there in the last year
Douglas S. KnopperDirector · Director at Magnite, filing Form 4 there in the last year
Nicola T. AllaisChief Financial Officer · Chief Financial Officer at DoubleVerify Holdings, filing Form 4 there in the last year