Insider · CIK 0001709574

Mark Zagorski

Files at: DV, TLRA. On EDGAR ↗

Period1M 3M 6M 1Y 2Y All datashares as filed — not split-adjusted

Open-market buys & salesbuys $142k · 2sales $0 · 0net $142k

Reported trades — common stock

Trade	Reported (ET)	Company	Shares	Avg price	Total	Owned after	Δ stake	Flags
Sep 15, 2026 FMForm 4 →	Sep 17, 4:08 pm EDT	DoubleVerify Holdings, Inc.DV	91,870	$13.50	$419,189	610,132	—
Jun 30, 2026 FMForm 4 →	Jul 1, 4:04 pm EDT	DoubleVerify Holdings, Inc.DV	20,929	$10.84	$80,791	580,364	—
Jun 15, 2026 FMForm 4 →	Jun 17, 4:07 pm EDT	DoubleVerify Holdings, Inc.DV	94,455	$10.25	$344,769	574,341	—
May 31, 2026 JForm 4 →	Jun 3, 4:12 pm EDT	DoubleVerify Holdings, Inc.DV	416	$8.25	$3,432	547,158	—	late
Feb 14, 2019 FMForm 4 →	Feb 26, 5:03 pm EST	Telaria, Inc.TLRA	26,581	$3.19	$23,447	91,144	—	plan? late
Jul 10, 2018 FMForm 4 →	Jul 12, 4:09 pm EDT	Telaria, Inc.TLRA	65,822	$4.06	$78,001	79,263	—	plan?
Nov 17, 2017 PForm 4 →	Nov 20, 5:04 pm EST	Telaria, Inc.TLRA	10,000	$4.02	$40,200	51,865	+23.9%	plan?
Aug 11, 2017 PForm 4 →	Aug 15, 4:56 pm EDT	TREMOR VIDEO INC.TRMR	41,865	$2.42	$101,313	41,865	—	plan?

Reported trades — derivatives (options, RSUs, warrants)

Trade	Reported (ET)	Company	Shares	Avg price	Total	Owned after	Δ stake	Flags
Sep 15, 2026 MForm 4 →	Sep 17, 4:08 pm EDT	DoubleVerify Holdings, Inc.DV	70,194	—	—	9,375	—
Jun 30, 2026 MForm 4 →	Jul 1, 4:04 pm EDT	DoubleVerify Holdings, Inc.DV	13,476	—	—	121,280	—
Jun 15, 2026 MForm 4 →	Jun 17, 4:07 pm EDT	DoubleVerify Holdings, Inc.DV	70,194	—	—	18,750	—
Feb 28, 2019 AForm 4 →	Mar 4, 4:51 pm EST	Telaria, Inc.TLRA	139,330	—	—	67,646	—
Feb 14, 2019 MForm 4 →	Feb 26, 5:03 pm EST	Telaria, Inc.TLRA	19,231	—	—	57,692	—	late
Jul 10, 2018 MForm 4 →	Jul 12, 4:09 pm EDT	Telaria, Inc.TLRA	46,610	—	—	139,830	—
Feb 27, 2018 AForm 4 →	Mar 1, 4:31 pm EST	Telaria, Inc.TLRA	232,573	—	—	155,650	—
Jul 10, 2017 AForm 4 →	Jul 12, 4:12 pm EDT	TREMOR VIDEO INC.TRMR	1,086,440	—	—	450,000	—