Jane Street discloses 3.3% beneficial stake in Amprius Technologies (AMPX) via 13G/A

Rhea-AI Filing Summary

Amprius Technologies, Inc. is reported to have 4,713,803 shares of its common stock beneficially owned by Jane Street Group, LLC and its subsidiaries on a Schedule 13G/A Amendment No. 1. This represents 3.3% of the outstanding common stock, placing the group below the 5% reporting threshold.

The filing states that Jane Street has no sole voting or dispositive power over these shares, but holds shared voting and dispositive power over all 4,713,803 shares through subsidiaries Jane Street Capital, LLC and Jane Street Global Trading, LLC, each organized in Delaware.

Key Figures

Shares beneficially owned: 4,713,803 shares Percent of class: 3.3% Shared voting power: 4,713,803 shares +5 more

8 metrics

Shares beneficially owned 4,713,803 shares Common stock beneficially owned by Jane Street Group, LLC and affiliates

Percent of class 3.3% Percentage of Amprius Technologies common stock class beneficially owned

Shared voting power 4,713,803 shares Shares over which Jane Street entities hold shared voting power

Sole voting power 0 shares Shares over which Jane Street entities hold sole voting power

Jane Street Capital holdings 3,751,460 shares Shares attributed to Jane Street Capital, LLC

Jane Street Global Trading holdings 962,343 shares Shares attributed to Jane Street Global Trading, LLC

Ownership threshold status 5 percent or less Ownership of 5 percent or less of the class indicated in Item 5

Signature date 08/10/2026 Date Jeremy Kahn signed on behalf of each Jane Street entity

Key Terms

Schedule 13G/A, beneficially owned, shared voting power, shared dispositive power, +1 more

5 terms

Schedule 13G/A regulatory

"Jane Street reports holdings on a Schedule 13G/A Amendment No. 1"

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.

beneficially owned financial

"Amount beneficially owned: 4,713,803.00 shares of common stock"

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 voting power financial

"Shared Voting Power 4,713,803.00 shares of common stock"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 4,713,803.00 shares of common stock"

percent of class financial

"Percent of class: 3.3% of Amprius Technologies common stock"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

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

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Available on EDGAR 08/10/2026 - 04:13 PM Accepted by SEC EDGAR 08/10/2026 - 04:13 PM Learn about SEC filing dates

FAQ

What percentage of Amprius Technologies (AMPX) shares does Jane Street report owning?

Jane Street reports beneficial ownership of 3.3% of Amprius Technologies common stock, representing 4,713,803 shares. This ownership is reported on a Schedule 13G/A Amendment No. 1 as of the filing’s referenced ownership information.

How many Amprius Technologies (AMPX) shares are beneficially owned by Jane Street entities?

Jane Street entities beneficially own 4,713,803 shares of Amprius Technologies common stock. All of these shares carry shared voting and shared dispositive power, with no sole voting or dispositive authority reported for any Jane Street entity.

Does Jane Street have sole or shared voting power over its AMPX holdings?

Jane Street reports 0 shares with sole voting power and 4,713,803 shares with shared voting power in Amprius Technologies. The same amounts apply to dispositive power, indicating all authority is held on a shared, not sole, basis.

Which Jane Street subsidiaries are identified in the Amprius Technologies (AMPX) Schedule 13G/A?

The filing identifies Jane Street Capital, LLC and Jane Street Global Trading, LLC as subsidiaries. Jane Street Capital is linked to 3,751,460 shares, and Jane Street Global Trading to 962,343 shares, all reported under Jane Street Group, LLC.

Is Jane Street reporting ownership of 5% or less of Amprius Technologies (AMPX) stock?

Yes. The Schedule 13G/A indicates ownership of 5 percent or less of the class, with a stated 3.3% beneficial ownership. This confirms Jane Street’s holdings are below the 5% threshold for this class of common stock.

When was the Amprius Technologies (AMPX) Schedule 13G/A signed by Jane Street?

The Schedule 13G/A was signed on 08/10/2026 by Jeremy Kahn as Authorized Signatory for each Jane Street entity. The cover also references the date 06/30/2026 in connection with the reported ownership information.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Amprius Technologies, Inc.

(Name of Issuer)

Common stock, $0.0001 par value

(Title of Class of Securities)

03214Q108

(CUSIP Number)

06/30/2026

(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 4,713,803.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,713,803.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,713,803.00

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)

3.3 %

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 3,751,460.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,751,460.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,751,460.00

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)

2.7 %

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 962,343.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 962,343.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

962,343.00

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)

0.7 %

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, 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 3rd Floor New York, NY 10281 Jane Street Capital, LLC 250 Vesey Street 3rd Floor New York, NY 10281 Jane Street Global Trading, LLC 250 Vesey Street 3rd 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 No.: 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: 4,713,803.00
(b)	Percent of class: 3.3%
(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: 4,713,803.00
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 4,713,803.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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:	08/10/2026

Jane Street Capital, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	08/10/2026

Jane Street Global Trading, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	08/10/2026