Jane Street (AAOI) files 13G showing 5.3% ownership split across subsidiaries

Rhea-AI Filing Summary

Applied Optoelectronics, Inc. Schedule 13G: Jane Street group reports beneficial ownership of 4,097,237 shares of Common Stock, representing 5.3% of the class as of 03/17/2026. The filing attributes shared voting and dispositive power across subsidiaries Jane Street Capital, Jane Street Options and Jane Street Global Trading.

The filing lists shared voting power and shared dispositive power of 4,097,237 shares and breaks holdings into subsidiary allocations: Jane Street Capital 1,864,091, Jane Street Global Trading 2,083,846, and Jane Street Options 149,300.

Insights

Governance Analyst

Large passive stake disclosed with shared control across trading subsidiaries.

The Schedule 13G shows a 5.3% beneficial stake in Applied Optoelectronics as of 03/17/2026, held with shared voting and dispositive power. Holdings are split among named subsidiaries, indicating allocation of authority within the Jane Street structure.

Proxy and governance effects depend on how the group exercises shared voting power; subsequent filings or amendments would clarify any active intent. Future disclosures may specify changes in voting posture or ownership percentages.

Equity Capital Markets Analyst

Stake size is notable but below common 10% activist thresholds.

The group holds 4,097,237 shares, shown as shared voting/dispositive power across subsidiaries. The breakdown lists 1,864,091, 2,083,846, and 149,300 shares by subsidiary, useful for understanding trading vs. strategic holdings.

Market impact depends on trading behavior; the filing is informational under passive-investor rules. Watch for any Form 13D or Form 4 filings that would indicate an active change in intent or transactions.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

APPLIED OPTOELECTRONICS, INC.

(Name of Issuer)

Common Stock, Par value $0.001

(Title of Class of Securities)

03823U102

(CUSIP Number)

03/17/2026

(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): 03823U102

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 4,097,237.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,097,237.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,097,237.00

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)

5.3 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 03823U102

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 1,864,091.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,864,091.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,864,091.00

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)

BD

SCHEDULE 13G

CUSIP Number(s): 03823U102

1

Names of Reporting Persons

Jane Street Options, 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 149,300.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 149,300.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

149,300.00

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)

0.2 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP Number(s): 03823U102

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 2,083,846.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,083,846.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,083,846.00

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)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: APPLIED OPTOELECTRONICS, INC.
(b)	Address of issuer's principal executive offices: 13139 JESS PIRTLE BLVD, SUGAR LAND, TEXAS, 77478.
Item 2.
(a)	Name of person filing: Jane Street Group, LLC; Jane Street Capital, LLC; Jane Street Options, 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 Options, 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, Par value $0.001
(e)	CUSIP Number(s): 03823U102
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: 4,097,237.00
(b)	Percent of class: 5.3 %
(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: 4,097,237.00
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 4,097,237.00
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 Options, 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:	03/23/2026

Jane Street Capital, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	03/23/2026

Jane Street Options, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	03/23/2026

Jane Street Global Trading, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	03/23/2026

FAQ

What stake does Jane Street report in APPLIED OPTOELECTRONICS (AAOI)?

Jane Street reports beneficial ownership of 4,097,237 shares, representing 5.3% of the common stock as of 03/17/2026. The stake is allocated across Jane Street subsidiaries with shared voting and dispositive power.

Which Jane Street entities hold shares in AAOI according to the filing?

The filing lists three subsidiaries: Jane Street Capital, LLC (1,864,091 shares), Jane Street Global Trading, LLC (2,083,846), and Jane Street Options, LLC (149,300 shares).

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

No. The filing shows 0 sole voting or dispositive power and reports 4,097,237 shares of shared voting and shared dispositive power across the group entities.

What does a 13G filing by Jane Street mean for AAOI shareholders?

A Schedule 13G indicates passive beneficial ownership under permitted rules; Jane Street reports a 5.3% stake as of 03/17/2026. It does not by itself signal an active plan to influence management or solicit proxies.

When was the Schedule 13G signed and who signed it for Jane Street?

The filing was signed by Jeremy Kahn (Authorized Signatory), with signature dates shown as 03/23/2026 for the submitted Schedule 13G records.