Jane Street reports 5.1% stake in Amprius Technologies

Jane Street Group, LLC reports shared beneficial ownership of 7,014,784 shares (5.1%) of Amprius Technologies, Inc. The filing shows shared voting and dispositive power over those shares.

Rhea-AI Filing Summary

Jane Street Group, LLC reports shared beneficial ownership of 7,014,784 shares (5.1%) of Amprius Technologies, Inc. The filing shows shared voting and dispositive power over those shares. Subsidiaries listed include Jane Street Capital, LLC (3,780,489 shares, 2.8%) and Jane Street Global Trading, LLC (3,234,295 shares, 2.4%).

The disclosure is a Schedule 13G ownership filing dated 04/28/2026, signed by Jeremy Kahn as authorized signatory.

Insights

Institutional Ownership Analyst

Large passive stake reported by Jane Street group, jointly held across subsidiaries.

Jane Street Group reports shared beneficial ownership of 7,014,784 shares, representing 5.1% of the class. The filing attributes shared voting and dispositive power rather than sole control, consistent with institutional aggregation.

Implications depend on whether this position is passive or active; subsequent filings could show changes in voting or disposition. Timing and trading intent are not stated in the excerpt.

Securities Compliance Counsel

Schedule 13G disclosure meets passive/investment-manager thresholds in form.

The Schedule 13G identifies the filer and subsidiaries and reports exact share counts and percentages, with signatures by an authorized signatory. It lists shared voting and dispositive power.

Filing mechanics appear standard; any change in intent or acquisition method would require amendment under reporting rules.

Key Figures

Beneficial ownership: 7,014,784 shares Percent of class: 5.1% Jane Street Capital holding: 3,780,489 shares +1 more

4 metrics

Beneficial ownership 7,014,784 shares Amount beneficially owned reported on Schedule 13G

Percent of class 5.1% Percent of common stock beneficially owned

Jane Street Capital holding 3,780,489 shares Subsidiary holding shown in filing (2.8%)

Jane Street Global Trading holding 3,234,295 shares Subsidiary holding shown in filing (2.4%)

Key Terms

Schedule 13G, Beneficially owned, Shared dispositive power

3 terms

Schedule 13G regulatory

"Schedule 13G ownership filing dated 04/28/2026"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Beneficially owned market

"Amount beneficially owned: 7,014,784.00"

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.

Shared dispositive power regulatory

"Shared Dispositive Power 7,014,784.00"

FAQ

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

What stake does Jane Street report in Amprius Technologies (AMPX)?

Jane Street Group reports shared beneficial ownership of 7,014,784 shares equal to 5.1% of common stock. The filing lists shared voting and dispositive power and attributes holdings across subsidiaries including Jane Street Capital and Jane Street Global Trading.

Which Jane Street subsidiaries hold AMPX shares and how many?

The filing lists two subsidiaries with specific holdings: Jane Street Capital, LLC holds 3,780,489 shares and Jane Street Global Trading, LLC holds 3,234,295 shares. These counts are shown as shared power in the Schedule 13G.

Does the Schedule 13G show sole voting or dispositive power for Jane Street?

No; the Schedule 13G reports 0 shares with sole voting or dispositive power and shows 7,014,784 shares with shared voting and dispositive power. The filing therefore attributes joint control rather than sole control.

When was the ownership disclosure signed and by whom?

The Schedule 13G is signed on 04/28/2026 by Jeremy Kahn as an authorized signatory for the reporting entities. The cover information lists the issuers' principal office address and the CUSIP 03214Q108.

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

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Accepted by SEC EDGAR 04/28/2026 - 04:07 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Amprius Technologies, Inc.

(Name of Issuer)

Common stock, $0.0001 par value

(Title of Class of Securities)

03214Q108

(CUSIP Number)

04/22/2026

(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): 03214Q108

1

Names of Reporting Persons

JANE STREET GROUP, 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 7,014,784.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,014,784.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,014,784.00

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)

5.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 03214Q108

1

Names of Reporting Persons

Jane Street Capital, 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 3,780,489.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,780,489.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,780,489.00

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)

2.8 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP Number(s): 03214Q108

1

Names of Reporting Persons

Jane Street Global Trading, 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 3,234,295.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,234,295.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,234,295.00

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)

2.4 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Amprius Technologies, Inc.
(b)	Address of issuer's principal executive offices: 1180 PAGE AVENUE, FREMONT, CALIFORNIA, 94538.
Item 2.
(a)	Name of person filing: Jane Street Group, LLC; Jane Street Capital, LLC; Jane Street Global Trading, LLC
(b)	Address or principal business office or, if none, residence: Jane Street Group, LLC 250 Vesey Street 6th Floor New York, NY 10281 Jane Street Capital, LLC 250 Vesey Street 6th Floor New York, NY 10281 Jane Street Global Trading, LLC 250 Vesey Street 6th Floor New York, NY 10281
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common stock, $0.0001 par value
(e)	CUSIP Number(s): 03214Q108
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: 7,014,784.00
(b)	Percent of class: 5.1%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 7,014,784.00
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 7,014,784.00
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.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Subsidiary Jane Street Capital, LLC Jane Street Global Trading, LLC
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 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.

JANE STREET GROUP, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	04/28/2026

Jane Street Capital, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	04/28/2026

Jane Street Global Trading, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	04/28/2026