Climb Bio, Inc. (CLYM): MPM BioImpact LLC reports 0% ownership in amendment

Rhea-AI Filing Summary

Climb Bio, Inc. received an amended institutional ownership report from MPM BioImpact LLC stating that it no longer holds any of the company’s common stock. MPM BioImpact reports 0 shares beneficially owned, representing 0.0% of the class, with no voting or dispositive power over any shares.

Key Figures

Shares beneficially owned: 0 shares Percent of class owned: 0.0% Sole voting power: 0 shares +3 more

6 metrics

Shares beneficially owned 0 shares Common Stock beneficial ownership reported by MPM BioImpact LLC

Percent of class owned 0.0% Percent of Climb Bio common stock class owned by MPM BioImpact LLC

Sole voting power 0 shares Shares over which MPM BioImpact LLC has sole power to vote

Shared voting power 0 shares Shares over which MPM BioImpact LLC has shared power to vote

Sole dispositive power 0 shares Shares over which MPM BioImpact LLC has sole power to dispose

Shared dispositive power 0 shares Shares over which MPM BioImpact LLC has shared power to dispose

Key Terms

beneficially owned, Sole Voting Power, dispositive power, Ownership of 5 Percent or Less of a Class, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 0"

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.

Sole Voting Power financial

"5 | Sole Voting Power 0.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole Dispositive Power 0.00 8 | Shared Dispositive Power 0.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Ownership of 5 Percent or Less of a Class financial

"Item 5. | Ownership of 5 Percent or Less of a Class."

principal executive offices financial

"Address of issuer's principal executive offices: 20 William Street"

FAQ

What does Climb Bio, Inc. (CLYM) disclose about MPM BioImpact LLC's ownership in this Schedule 13G/A?

MPM BioImpact LLC reports it beneficially owns 0 shares of Climb Bio, Inc. common stock, representing 0.0% of the class, and has no sole or shared voting or dispositive power over any shares.

Does MPM BioImpact LLC remain a 5% beneficial owner of Climb Bio, Inc. (CLYM)?

No. MPM BioImpact LLC indicates it owns 5 percent or less of Climb Bio’s common stock and reports 0 shares and 0.0% beneficial ownership, meaning it is no longer a reporting 5% holder.

How many Climb Bio, Inc. (CLYM) shares does MPM BioImpact LLC have voting power over?

MPM BioImpact LLC reports 0 shares with sole voting power and 0 shares with shared voting power, so it has no ability to vote or direct the vote of any Climb Bio common stock.

What dispositive power over Climb Bio, Inc. (CLYM) shares does MPM BioImpact LLC report?

MPM BioImpact LLC reports 0 shares with sole dispositive power and 0 shares with shared dispositive power, indicating it cannot dispose of or direct the disposition of any Climb Bio common stock.

Who signed the amended ownership report for Climb Bio, Inc. (CLYM)?

The amendment was signed by Christopher Wolf, identified as Chief Financial Officer, on 08/14/2026, certifying the reported ownership information for MPM BioImpact LLC regarding Climb Bio’s common stock.

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

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Available on EDGAR 08/14/2026 - 04:26 PM Accepted by SEC EDGAR 08/14/2026 - 04:02 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)

Climb Bio, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

28658R106

(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): 28658R106

1

Names of Reporting Persons

MPM BioImpact 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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

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)

0.0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Climb Bio, Inc.
(b)	Address of issuer's principal executive offices: 20 William Street, Suite 145, Wellesley Hills, MA, 02481.
Item 2.
(a)	Name of person filing: MPM BioImpact LLC
(b)	Address or principal business office or, if none, residence: 399 Boylston Street, Suite 1100 Boston, MA 02116
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP No.: 28658R106
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: 0
(b)	Percent of class: 0.0%
(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: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	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.

MPM BioImpact LLC

Signature:	Christopher Wolf
Name/Title:	Chief Financial Officer
Date:	08/14/2026