ACV Auctions: Atreides Reports 9.73M Shares (5.6%)

ACV Auctions Inc. Schedule 13G/A amendment: Atreides Management reports beneficial ownership of 9,734,467 shares of ACV Auctions common stock, representing 5.6% of the class based on 174,071,580 shares outstanding as of February 16, 2026.

Rhea-AI Filing Summary

ACV Auctions Inc. Schedule 13G/A amendment: Atreides Management reports beneficial ownership of 9,734,467 shares of ACV Auctions common stock, representing 5.6% of the class based on 174,071,580 shares outstanding as of February 16, 2026.

The filing states shared voting and dispositive power of 9,734,467 shares for Atreides entities and a total reported position of 9,743,496 shares for Gavin Baker. The statement is filed by Atreides Management, LP, Atreides Management, LLC, and Gavin Baker and incorporates a previously filed joint filing agreement dated February 17, 2026.

Insights

Institutional Ownership Analyst

Atreides reports a ~5.6% stake in ACV Auctions via shared voting/dispositive power.

The filing shows Atreides Management entities hold 9,734,467 shares with shared voting and dispositive power; Gavin Baker's combined position is reported as 9,743,496 shares. The percentages are calculated using 174,071,580 shares outstanding as of February 16, 2026.

Beneficial ownership is presented on an aggregated basis across funds and accounts managed by Atreides; the filing includes a joint filing agreement dated February 17, 2026. Timing and cash‑flow treatment for any subsequent transactions are not disclosed in the provided excerpt.

Key Figures

Atreides shared position: 9,734,467 shares Gavin Baker total position: 9,743,496 shares Percent of class: 5.6% +2 more

5 metrics

Atreides shared position 9,734,467 shares shared voting and dispositive power reported in the Schedule 13G/A

Gavin Baker total position 9,743,496 shares total reported position for Gavin Baker shown on cover page

Percent of class 5.6% percentage based on 174,071,580 shares outstanding as of <date>February 16, 2026</date>

Shares outstanding used 174,071,580 shares issuer's Form 10-K reporting outstanding shares as of <date>February 16, 2026</date>

Gavin Baker sole voting power 9,029 shares sole voting/dispositive power reported for Gavin Baker

Key Terms

Schedule 13G/A, Shared Dispositive Power, Beneficially owned

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 and cover page identifying the filing as a Schedule 13G/A"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Shared Dispositive Power financial

"Cover page rows listing 'Shared Dispositive Power 9,734,467.00'"

Beneficially owned regulatory

"Item 4(a) 'Amount beneficially owned: See Row 9 of cover page'"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

FAQ

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

What stake does Atreides report in ACVA?

The filing reports 9,734,467 shares held with shared voting/dispositive power, equal to 5.6% of the class based on 174,071,580 shares outstanding as of February 16, 2026. This position is reported by Atreides entities and Gavin Baker.

Who filed the Schedule 13G/A for ACV Auctions (ACVA)?

The statement is filed by Atreides Management, LP, Atreides Management, LLC, and Gavin Baker. A joint filing agreement dated February 17, 2026 is incorporated by reference in the filing.

How is voting and dispositive power reported for Atreides?

Atreides entities report 0 sole voting/dispositive power and 9,734,467 shared voting and dispositive power, per the cover page rows cited in the Schedule 13G/A amendment.

What basis was used to calculate the 5.6% ownership figure?

The percentage is calculated using 174,071,580 shares outstanding reported by the issuer as of February 16, 2026 in its Form 10-K for the fiscal year ended December 31, 2025, as cited in the Schedule 13G/A.

Does the filing show sole control of the reported shares?

No. The filing discloses shared voting and dispositive power of 9,734,467 shares for Atreides entities and records 9,029 shares as sole voting/dispositive for Gavin Baker; overall control is shown as shared.

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

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Accepted by SEC EDGAR 05/15/2026 - 04:16 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

ACV Auctions Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

00091G104

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 00091G104

1

Names of Reporting Persons

Atreides Management, LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,734,467.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,734,467.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,734,467.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.6 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): 00091G104

1

Names of Reporting Persons

Atreides Management, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,734,467.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,734,467.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,734,467.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.6 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 00091G104

1

Names of Reporting Persons

Gavin Baker

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 9,029.00
6	Shared Voting Power 9,734,467.00
7	Sole Dispositive Power 9,029.00
8	Shared Dispositive Power 9,734,467.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,743,496.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.6 %

12

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ACV Auctions Inc.
(b)	Address of issuer's principal executive offices: 640 ELLICOTT STREET, 640 ELLICOTT STREET, BUFFALO, NEW YORK, 14203.
Item 2.
(a)	Name of person filing: This statement is filed by: (i) Atreides Management, LP, a Delaware limited partnership registered with the U.S. Securities and Exchange Commission (the "SEC"), which serves as the investment manager (the "Investment Manager") to certain investment funds and/or accounts (the "Funds"), with respect to the shares of Common Stock (as defined in Item 2(d) below) held by the Funds; (ii) Atreides Management, LLC, a Delaware limited liability company (the "GP"), which serves as the general partner to the Investment Manager, with respect to the shares of Common Stock held by the Funds; and (iii) Gavin Baker, a United States citizen, who serves as the managing member to the GP with respect to the shares of Common Stock held by the Funds. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons". Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party.
(b)	Address or principal business office or, if none, residence: Atreides Management, LP One International Place, Suite 4410 Boston, MA 02110
(c)	Citizenship: See response to Item 2(a).
(d)	Title of class of securities: Common Stock, par value $0.001 per share
(e)	CUSIP No.: 00091G104
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: See Row 9 of cover page for each Reporting Person.
(b)	Percent of class: See Row 11 of cover page for each Reporting Person.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See Row 5 of cover page for each Reporting Person.
	(ii) Shared power to vote or to direct the vote: See Row 6 of cover page for each Reporting Person.
	(iii) Sole power to dispose or to direct the disposition of: See Row 7 of cover page for each Reporting Person.
	(iv) Shared power to dispose or to direct the disposition of: See Row 8 of cover page for each Reporting Person. The percentages used herein and in the rest of this Schedule 13G are calculated based upon the 174,071,580 shares of Common Stock reported to be outstanding by the Issuer as of February 16, 2026 in its Form 10-K for the fiscal year ended December 31, 2025 filed with the SEC on February 23, 2026. Each Reporting Person hereby expressly disclaims beneficial ownership in the securities reported in this Schedule 13G except to the extent of its or his pecuniary interest therein (if any) and membership in a "group" as that term is described in Rule 13d-5(b)(1) of the Securities Exchange Act of 1934, as amended. Shares reported herein are owned by Atreides Foundation Master Fund LP, certain separately managed accounts managed by Atreides Management, LP, and Gavin Baker.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Atreides Management, LP

Signature:	Laura Malone
Name/Title:	Laura Malone, General Counsel & CCO
Date:	05/15/2026

Atreides Management, LLC

Signature:	Laura Malone
Name/Title:	Laura Malone, General Counsel & CCO
Date:	05/15/2026

Gavin Baker

Signature:	Gavin Baker
Name/Title:	Gavin Baker, individually
Date:	05/15/2026

Exhibit Information

Joint Filing Agreement, dated February 17, 2026, by and among the Reporting Persons, was previously filed with the SEC on February 17, 2026 as Exhibit 99.1 to the Schedule 13G filed by the Reporting Persons with respect to ACV Auctions Inc. and is incorporated herein by reference.