Sutro Biopharma investor Kynam holds 872,558 shares

Sutro Biopharma, Inc. Schedule 13G/A shows 872,558 shares of Common Stock were reported beneficially owned, representing 5.27% of the class as disclosed with a 03/31/2026 reference.

Rhea-AI Filing Summary

Sutro Biopharma, Inc. Schedule 13G/A shows 872,558 shares of Common Stock were reported beneficially owned, representing 5.27% of the class as disclosed with a 03/31/2026 reference. The ownership is reported by Kynam Capital Management entities and Yue Tang, each with shared voting and dispositive power over the same 872,558 shares.

Insights

Institutional Ownership Analyst

Institutional holder reports a 5.27% shared stake in Sutro Biopharma.

The filing lists 872,558 shares as beneficially owned with 5.27% of the class as of 03/31/2026. The position is reported across Kynam Capital Management, Kynam Capital Management GP, LLC, and Yue Tang, each shown with shared voting and dispositive power over the same shares.

Cash‑flow treatment is not stated in the excerpt; subsequent filings would show any trades or disposals. The ownership is a disclosure of position size rather than a transaction-oriented filing.

Compliance & Governance Specialist

Disclosure emphasizes shared authority rather than sole control over the reported shares.

The Schedule 13G/A attributes 872,558 shares to shared voting and shared dispositive power for the listed filers. Signatures bear a 05/15/2026 signing date in the excerpt.

Filing indicates beneficial ownership reporting obligations were met; any change in voting or disposition authority would require updated disclosure in future filings.

Key Figures

Beneficial ownership: 872,558 shares Percent of class: 5.27% Sole voting power: 0 shares +2 more

5 metrics

Beneficial ownership 872,558 shares reported on Schedule 13G/A with <date>03/31/2026</date> reference

Percent of class 5.27% percentage corresponding to 872,558 shares

Sole voting power 0 shares each filer reports 0 sole voting power

Shared voting power 872,558 shares shared voting power reported by Kynam entities and Yue Tang

Signature date 05/15/2026 dates shown next to signatures in the excerpt

Key Terms

beneficially owned, shared dispositive power, Schedule 13G/A

3 terms

beneficially owned regulatory

"Amount beneficially owned: 872,558"

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 872,558.00"

Schedule 13G/A regulatory

"Form type: 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.

FAQ

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

What stake does Kynam Capital hold in Sutro Biopharma (STRO)?

Kynam Capital reports beneficial ownership of 872,558 shares, equal to 5.27% of the class. The Schedule 13G/A shows these shares are subject to shared voting and dispositive power among Kynam entities and Yue Tang as reported with a 03/31/2026 reference.

Who is listed as the filer for the 13G/A reporting the STRO stake?

Kynam Capital Management, LP, Kynam Capital Management GP, LLC, and Yue Tang are listed as filers. The filing gives their addresses and citizenships and shows shared voting and dispositive power over the same 872,558 shares.

Does the filing show sole control of the reported STRO shares?

No. The Schedule 13G/A lists 0 shares as sole voting or sole dispositive power and 872,558 shares as shared voting and dispositive power. That indicates shared authority across the named reporting persons.

When was the Schedule 13G/A for STRO signed?

The signatures in the excerpt are dated 05/15/2026. The ownership figure is presented with a 03/31/2026 reference in the document, and the signatures confirm the filing on 05/15/2026.

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

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Accepted by SEC EDGAR 05/15/2026 - 04:01 PM EDT 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)

Sutro Biopharma, Inc.

(Name of Issuer)

Common stock, $0.001 par value

(Title of Class of Securities)

869367102

(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): 869367102

1

Names of Reporting Persons

Kynam Capital 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 872,558.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 872,558.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

5.27 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 869367102

1

Names of Reporting Persons

Kynam Capital Management GP, 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 872,558.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 872,558.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

5.27 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 869367102

1

Names of Reporting Persons

Yue Tang

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 0.00
6	Shared Voting Power 872,558.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 872,558.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

5.27 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Sutro Biopharma, Inc.
(b)	Address of issuer's principal executive offices: 111 Oyster Point Blvd., South San Francisco, CALIFORNIA 94080
Item 2.
(a)	Name of person filing: Kynam Capital Management, LP Kynam Capital Management GP, LLC Yue Tang
(b)	Address or principal business office or, if none, residence: 221 ELM ROAD PRINCETON, New Jersey 08540
(c)	Citizenship: Kynam Capital Management, LP - DELAWARE Kynam Capital Management GP, LLC - DELAWARE Yue Tang - UNITED STATES
(d)	Title of class of securities: Common stock, $0.001 par value
(e)	CUSIP No.: 869367102
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: 872,558
(b)	Percent of class: 5.27 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Kynam Capital Management, LP - 0 Kynam Capital Management GP, LLC - 0 Yue Tang - 0
	(ii) Shared power to vote or to direct the vote: Kynam Capital Management, LP - 872,558 Kynam Capital Management GP, LLC - 872,558 Yue Tang - 872,558
	(iii) Sole power to dispose or to direct the disposition of: Kynam Capital Management, LP - 0 Kynam Capital Management GP, LLC - 0 Yue Tang - 0
	(iv) Shared power to dispose or to direct the disposition of: Kynam Capital Management, LP - 872,558 Kynam Capital Management GP, LLC - 872,558 Yue Tang - 872,558
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.

Kynam Capital Management, LP

Signature:	Yue Tang
Name/Title:	Managing Member
Date:	05/15/2026

Kynam Capital Management GP, LLC

Signature:	Yue Tang
Name/Title:	Managing Member
Date:	05/15/2026

Yue Tang

Signature:	Yue Tang
Name/Title:	Self
Date:	05/15/2026