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Cormorant takes 11.8% stake in BlossomHill

BlossomHill Therapeutics, Inc. (BLSM) is the subject of a Schedule 13D filed by a group of Cormorant-managed investment funds and Bihua Chen, disclosing a significant ownership stake.

(Moderate)
(Neutral)
Form Type
SCHEDULE 13D

Rhea-AI Filing Summary

BlossomHill Therapeutics, Inc. (BLSM) is the subject of a Schedule 13D filed by a group of Cormorant-managed investment funds and Bihua Chen, disclosing a significant ownership stake. The group reports beneficial ownership of 3,615,362 shares of common stock, representing 11.8% of BLSM’s outstanding shares based on 30,643,660 shares outstanding after the IPO.

The position consists largely of shares issued upon the automatic conversion of Series A and Series B Preferred Stock at BLSM’s August 10, 2026 initial public offering, plus 312,500 shares purchased in the IPO at $16.00 per share. The preferred investments totaled approximately $49.999 million, and the IPO purchase was $5 million, all funded from the reporting funds’ working capital. Bihua Chen, who is a director of BlossomHill and manager of the Cormorant entities, also holds stock options, including a grant for up to 23,904 shares at $16.00. The reporting persons describe the holdings as for investment purposes and indicate they may buy or sell shares and may engage with BLSM’s board and management on strategic and governance matters. They also hold registration rights, including demand, Form S-3, and piggyback rights, under a December 28, 2023 Investor Rights Agreement.

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Beneficial ownership shares 3,615,362 shares Total BlossomHill common shares beneficially owned by Cormorant group and Bihua Chen
Ownership percentage 11.8 % Percent of 30,643,660 BLSM shares outstanding after IPO
Shares outstanding 30,643,660 shares BlossomHill common stock outstanding following IPO, used for ownership calculations
Series A conversion shares 1,599,993 shares Common shares issued on automatic conversion of Series A Preferred Stock at IPO
Series B conversion shares 1,701,541 shares Common shares issued on automatic conversion of Series B Preferred Stock at IPO
Preferred stock investment $49,999,990.59 Approximate purchase price of Series A and B Preferred Stock by reporting persons
IPO purchase by fund $5,000,000 Purchase of 312,500 BLSM shares at $16.00 per share in IPO
Director option grant 23,904 shares at $16.00 Stock option grant to Bihua Chen vesting monthly over three years from August 6, 2026
beneficially owned financial
"The information required on the remainder... Number of Shares Beneficially Owned..."
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.
initial public offering financial
"upon the closing of the Issuer's initial public offering on August 10, 2026"
An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.
demand registration rights regulatory
"These rights include demand registration rights, Form S-3 registration rights"
Form S-3 registration rights regulatory
"These rights include demand registration rights, Form S-3 registration rights"
piggyback registration rights regulatory
"These rights include demand registration rights, Form S-3 registration rights and piggyback registration rights"
A contractual right that lets existing shareholders join a company’s planned public sale of stock so they can sell their own shares at the same time under the same paperwork. It matters to investors because it gives insiders and early holders an easier, often faster way to convert shares to cash, while also potentially increasing the number of shares offered and affecting the share price — like catching a scheduled bus instead of hiring a private ride to get where you need to go.

FAQ

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

How much of BlossomHill Therapeutics (BLSM) does the Cormorant group beneficially own?

The Cormorant-managed funds and Bihua Chen beneficially own 3,615,362 shares of BlossomHill Therapeutics common stock, representing 11.8% of the company’s 30,643,660 shares outstanding following the IPO, as disclosed in the Schedule 13D.

How did the Cormorant group acquire its BLSM stake disclosed in this Schedule 13D?

The group received 1,599,993 and 1,701,541 BLSM shares upon automatic conversion of Series A and B preferred at the IPO and purchased 312,500 shares in the IPO at $16.00 per share, funding all purchases from working capital.

What price did the Cormorant funds pay for their BlossomHill (BLSM) IPO shares?

Cormorant Global Healthcare Master Fund, LP acquired 312,500 BlossomHill shares in the IPO at $16.00 per share, for an aggregate consideration of $5,000,000, as reported in the Schedule 13D filing.

What options and board role does Bihua Chen have at BlossomHill Therapeutics (BLSM)?

Bihua Chen is disclosed as a director of BlossomHill Therapeutics. She was granted a stock option to purchase up to 23,904 shares of common stock at $16.00 per share, vesting in equal monthly installments over three years from August 6, 2026.

What registration rights do the Cormorant investors hold in BlossomHill (BLSM)?

Under a Third Amended and Restated Investor Rights Agreement dated December 28, 2023, the Cormorant investors have demand registration rights, Form S-3 registration rights, and piggyback registration rights for their BlossomHill common stock.

What are the Cormorant group’s stated intentions regarding its BLSM investment?

The reporting persons state they hold BLSM shares for investment purposes and may buy more or sell shares over time. They may also discuss strategic alternatives, capital structure, governance, and other matters with BlossomHill’s board and management.

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

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Learn about SEC filing dates





095130100

(CUSIP Number)
Neb Obradovic
Cormorant Asset Management, LP, 200 Clarendon Street, 50th Floor
Boston, MA, 02116
857-702-0386

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
08/06/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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SCHEDULE 13D


Cormorant Global Healthcare Master Fund, LP
Signature:/s/ CORMORANT GLOBAL HEALTHCARE MASTER FUND, LP By: Cormorant Global Healthcare GP, LLC, its General Partner
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Global Healthcare GP, LLC
Signature:/s/ Bihua Chen
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Private Healthcare Fund III, LP
Signature:/s/ CORMORANT PRIVATE HEALTHCARE FUND III, LP By: Cormorant Private Healthcare GP III, LLC, its General Partner
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Private Healthcare GP III, LLC
Signature:/s/ Bihua Chen
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Private Healthcare Fund V, LP
Signature:/s/ CORMORANT PRIVATE HEALTHCARE FUND V, LP By: Cormorant Private Healthcare GP V, LLC, its General Partner
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Private Healthcare GP V, LLC
Signature:/s/ Bihua Chen
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Private Healthcare Fund VI, LP
Signature:/s/ CORMORANT PRIVATE HEALTHCARE FUND VI, LP By: Cormorant Private Healthcare GP VI, LLC, its General Partner
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Private Healthcare GP VI, LLC
Signature:/s/ Bihua Chen
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Cormorant Asset Management, LP
Signature:/s/ CORMORANT ASSET MANAGEMENT, LP By: Cormorant Asset Management GP, LLC, its General Partner
Name/Title:By: Bihua Chen, Managing Member
Date:08/13/2026
Chen Bihua
Signature:/s/ Bihua Chen
Name/Title:Bihua Chen
Date:08/13/2026

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