SEC ownership of ACV Auctions Inc.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001637873.

Comparable stake leader

Atreides Management, LP

Disclosed value leader

MASSACHUSETTS FINANCIAL SERVICES CO /MA/

Comparable rows

50/50

Latest evidence

27 May 2026

Top shareholders Insider holders Latest transactions

Public ticker: ACVA on NYSE
Parsed ownership sources: 13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder: Atreides Management, LP
Ranking: Comparable ownership first, then disclosed value
Comparable ownership rows: 50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder: Atreides Management, LP
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date: 27 May 2026
Freshness: Most recent filing date in this holder set
Issuer CIK: 0001637873
Issuer location: Buffalo, NY

Ownership snapshot

Top shareholders of ACV Auctions Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Atreides Management, LP

Disclosed value leader

MASSACHUSETTS FINANCIAL S...

Comparable rows

50/50

Latest evidence

27 May 2026

13D/G 13F 3/4/5 Lead comparable stake: 5.6% 13D/G row: Atreides Management, LP Showing 1-8 of 50 holder rows.

Quick read

Atreides Management, LP leads the comparable SEC ownership view at 5.6%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Atreides Management, LP's linked filing trail.

Comparable ownership Top 5

Atreides Management, LP 5.6%

WILLIAM BLAIR INVESTMENT MANAGEME... 4.1%

MASSACHUSETTS FINANCIAL SERVICES ... 3.9%

FMR LLC 2.7%

Brian Hirsch 1.1%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Atreides Management, LP	13D/G 13F Gavin Baker · Company 13D/G 13F	5.6%	$44,040,602 9,743,496 shares	-$12,101,545	31 Mar 2026
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	13D/G 13F Company 13D/G 13F	4.1%	$32,601,056 7,212,623 shares	-$17,466,573	31 Mar 2026
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	13D/G Massachusetts Financial Services Company 13D/G	3.9%	$65,841,416 6,643,937 shares	$0	30 Sep 2025
FMR LLC	13D/G 13F Company 13D/G 13F	2.7%	$45,306,471 4,571,793 shares	-$39,446,269	30 Sep 2025
Brian Hirsch	3/4/5 Director 3/4/5	1.1%	$8,437,450 1,989,965 shares	+$500,346	27 May 2026
Robert P. Goodman	3/4/5 Director 3/4/5	0.26%	$2,231,920 457,820 shares	+$5,118,609	27 May 2026
Brian J. Radecki	3/4/5 Director 3/4/5	0.11%	$1,813,800 187,916 shares	—	27 May 2026
BlackRock, Inc.	13F Company 13F	7.5%	$55,689,903 13,134,411 shares	—	31 Mar 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to buying over the last 12 months. Net value: +$7,062,124.

Buys

$7,364,426

Insiders: 5

Sells

$302,302

Insiders: 2

Net

+$7,062,124

Shares: +1,290,451

Window

Last 12 months

4 rolling buckets

Buy value Sell value

Shares: 1,314,201 Shares: 23,750

Window (months)	Buy shares	Sell shares	Buy value	Sell value	Net value
0-3	0	0	$0	$0	$0
3-6	255,764	1,750	$1,245,921	$15,488	+$1,230,434
6-9	1,058,437	5,250	$6,118,505	$43,522	+$6,074,983
9-12	0	16,750	$0	$243,292	-$243,292

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-14 of 14 reporting-owner rows connected to ACV Auctions Inc.. Open a relationship link for the CIK-to-CIK filing trail.

Rows

Largest Forms 3/4/5 holder

Bessemer Venture Partners IX L.P.

Net 12M change

+$7,062,124

Latest report

01 Jul 2026

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Bessemer Venture Partners IX L.P.	10%+ Owner	$148,170,524			Mixed	06 Dec 2023
George Chamoun	Chief Executive Officer, Director	$69,170,457	+$620,186	+0.9%	Mixed	01 Jul 2026
William Zerella	Chief Financial Officer	$21,286,040			Mixed	01 Jul 2026
Vikas Mehta	Chief Operating Officer	$17,180,347			Mixed	01 Jul 2026
Michael Waterman	Chief Sales Officer	$12,613,649	+$1,000,036	+8.6%	Mixed	01 Jul 2026
Leanne Fitzgerald	Chief Legal Officer	$10,885,361			Mixed	01 Jul 2026
Craig Eric Anderson	Ccdso	$9,985,270	-$225,600	-2.2%	Mixed	01 Jul 2026
Brian Hirsch	Director	$8,437,450	+$500,346	+6.3%	Mixed	27 May 2026
Robert P. Goodman	Director	$2,231,920	+$5,118,609	+229%	Mixed	27 May 2026
Brian J. Radecki	Director	$1,813,800			Mixed	27 May 2026
Andrew Peer	VP, Corporate Controller & CAO	$1,719,816	-$76,703	-4.3%	Mixed	01 Jul 2026
Eileen A. Kamerick	Director	$1,491,834			Mixed	27 May 2026
Kirsten Castillo	Director	$721,220	+$125,250	+21%	Mixed	27 May 2026
Rene F. Jones	Director	$534,903			Mixed	27 May 2026

Recent insider transactions for ACV Auctions Inc.

Showing up to 300 recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	SEC-reported value	SEC-reported price	Shares	Shares owned	Date	Ownership
Craig Eric Anderson	ACVA	Common Stock	Tax liability	-4.47%			-22,217	474,434	01 Jul 2026	Direct
George Chamoun	ACVA	Common Stock	Tax liability	-1.6%			-54,686	3,365,107	01 Jul 2026	Direct
Leanne Fitzgerald	ACVA	Common Stock	Tax liability	-3.14%			-17,818	550,464	01 Jul 2026	Direct
Vikas Mehta	ACVA	Common Stock	Tax liability	-3.56%			-29,964	812,623	01 Jul 2026	Direct
Andrew Peer	ACVA	Common Stock	Tax liability	-4.37%			-4,311	94,252	01 Jul 2026	Direct
Michael Waterman	ACVA	Common Stock	Tax liability	-2.61%			-21,567	805,683	01 Jul 2026	Direct
William Zerella	ACVA	Common Stock	Tax liability	-2%			-21,919	1,076,721	01 Jul 2026	Direct
Robert P. Goodman	ACVA	Common Stock	Award	6.97%			27,500	421,826	27 May 2026	Direct
Rene F. Jones	ACVA	Common Stock	Award	143.9%			27,500	46,607	27 May 2026	Direct
Eileen A. Kamerick	ACVA	Common Stock	Award	278.7%			27,500	37,368	27 May 2026	Direct
Kirsten Castillo	ACVA	Common Stock	Award	70.3%			27,500	66,607	27 May 2026	Direct
Brian Hirsch	ACVA	Class A Common Stock	Award	27.6%			27,500	127,178	27 May 2026	Direct
Brian J. Radecki	ACVA	Common Stock	Award	34.3%			27,500	107,708	27 May 2026	Direct
George Chamoun	ACVA	Common Stock	Award	17.1%			500,221	3,419,793	02 Apr 2026	Direct
Craig Eric Anderson	ACVA	Common Stock	Tax liability	-2.61%			-13,261	494,151	01 Apr 2026	Direct
Craig Eric Anderson	ACVA	Common Stock	Award	62.1%			194,348	507,412	01 Apr 2026	Direct
George Chamoun	ACVA	Common Stock	Tax liability	-1.13%			-33,405	2,919,572	01 Apr 2026	Direct
Leanne Fitzgerald	ACVA	Common Stock	Tax liability	-2.82%			-16,456	567,209	01 Apr 2026	Direct
Leanne Fitzgerald	ACVA	Common Stock	Award	49.9%			194,348	583,665	01 Apr 2026	Direct
Vikas Mehta	ACVA	Common Stock	Tax liability	-2.01%			-17,189	840,087	01 Apr 2026	Direct
Vikas Mehta	ACVA	Common Stock	Award	53.9%			300,300	857,276	01 Apr 2026	Direct
Michael Waterman	ACVA	Common Stock	Tax liability	-1.52%			-12,743	825,428	01 Apr 2026	Direct
Michael Waterman	ACVA	Common Stock	Award	47.3%			269,069	838,171	01 Apr 2026	Direct
William Zerella	ACVA	Common Stock	Tax liability	-1.16%			-12,860	1,098,640	01 Apr 2026	Direct
William Zerella	ACVA	Common Stock	Award	33.1%			276,276	1,111,500	01 Apr 2026	Direct
Andrew Peer	ACVA	Common Stock	Tax liability	-3.37%			-3,409	97,800	01 Apr 2026	Direct
Andrew Peer	ACVA	Common Stock	Award	39.6%			28,736	101,209	01 Apr 2026	Direct
George Chamoun	ACVA	Common Stock	Purchase	0.83%	$122,574	$5.05	24,272	2,952,977	09 Mar 2026	Direct
Michael Waterman	ACVA	Common Stock	Purchase	60.5%	$1,000,036	$4.66	214,600	569,102	26 Feb 2026	Direct
George Chamoun	ACVA	Common Stock	Purchase	0.58%	$123,312	$7.30	16,892	2,928,705	09 Feb 2026	Direct
George Chamoun	ACVA	Common Stock	Options Exercise	12.1%			313,430	2,911,813	30 Jan 2026	Direct
George Chamoun	ACVA	Employee Stock Option (Right to Buy)	Options Exercise	-77.8%			-313,430	89,300	30 Jan 2026	Direct
Andrew Peer	ACVA	Common Stock	Sale	-2.36%	$15,488	$8.85	-1,750	72,473	15 Jan 2026	Direct
Andrew Peer	ACVA	Common Stock	Options Exercise	2.41%			1,750	74,223	15 Jan 2026	Direct
Andrew Peer	ACVA	Employee Stock Option (Right to Buy)	Options Exercise	-5.69%			-1,750	29,000	15 Jan 2026	Direct
George Chamoun	ACVA	Common Stock	Purchase	0.55%	$125,860	$8.81	14,286	2,598,383	12 Jan 2026	Direct
Craig Eric Anderson	ACVA	Common Stock	Tax liability	-4.42%			-14,474	313,064	02 Jan 2026	Direct
George Chamoun	ACVA	Common Stock	Tax liability	-1.32%			-34,617	2,584,097	02 Jan 2026	Direct
Leanne Fitzgerald	ACVA	Common Stock	Tax liability	-4.33%			-17,619	389,317	02 Jan 2026	Direct
Vikas Mehta	ACVA	Common Stock	Tax liability	-3.2%			-18,401	556,976	02 Jan 2026	Direct
Michael Waterman	ACVA	Common Stock	Tax liability	-3.77%			-13,905	354,502	02 Jan 2026	Direct
William Zerella	ACVA	Common Stock	Tax liability	-1.65%			-14,022	835,224	02 Jan 2026	Direct
Andrew Peer	ACVA	Common Stock	Tax liability	-3.35%			-2,512	72,473	02 Jan 2026	Direct
Andrew Peer	ACVA	Common Stock	Award	35%			19,431	74,985	01 Jan 2026	Direct
George Chamoun	ACVA	Common Stock	Purchase	1.2%	$248,441	$7.97	31,172	2,618,714	15 Dec 2025	Direct
Andrew Peer	ACVA	Common Stock	Sale	-3.05%	$14,052	$8.03	-1,750	55,554	15 Dec 2025	Direct
Andrew Peer	ACVA	Common Stock	Options Exercise	3.21%			1,750	56,238	15 Dec 2025	Direct
Andrew Peer	ACVA	Employee Stock Option (Right to Buy)	Options Exercise	-5.38%			-1,750	30,750	15 Dec 2025	Direct
Andrew Peer	ACVA	Common Stock	Sale	-3.11%	$14,000	$8.00	-1,750	54,488	01 Dec 2025	Direct
Andrew Peer	ACVA	Common Stock	Options Exercise	3.21%			1,750	56,238	01 Dec 2025	Direct

^* marks a reported price that did not pass the local price check.