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ADARx Pharmaceuticals: OrbiMed reports 14% stake

Certain holders have Form S-1 and Form S-3 registration rights, and IPO-related lock-ups extend 180 days after the final prospectus.

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Form Type
SCHEDULE 13D

Rhea-AI Filing Summary

ADARx Pharmaceuticals, Inc. (ADRX) has five OrbiMed entities reporting beneficial ownership of its common stock. OrbiMed Advisors LLC reported 14,913,764 shares with shared voting and dispositive power, representing 14% of the class. The disclosed fund holdings include 14,325,529 shares held by OrbiMed Private Investments VII, LP, 9,292,025 held by OrbiMed Israel Partners II, L.P., and 588,235 held by OrbiMed Genesis Master Fund, L.P. Some shares are attributed to related managers or general partners as well as the funds.

The funds also purchased shares in the IPO at $17.00 per share: OrbiMed Private Investments VII, LP bought 300,249, OrbiMed Israel Partners II, L.P. bought 61,516, and OrbiMed Genesis Master Fund, L.P. bought 588,235. Certain holders have Form S-1 and Form S-3 registration rights subject to stated thresholds. Lock-up agreements restrict transfers and related transactions until 180 days after the final IPO prospectus, subject to limited circumstances.

Filing Explained

Two ADARx directors are affiliated with the reporting group; the filing says OrbiMed may be able to influence control, describes the stake as an investment rather than an effort to acquire control, and reports no formulated plans for the listed corporate changes.

Beneficial ownership 14,913,764 shares OrbiMed Advisors LLC; 14% of the class, with shared voting and dispositive power
Fund shares held 14,325,529 shares OrbiMed Private Investments VII, LP; 13.4% of the class
Fund shares held 9,292,025 shares OrbiMed Israel Partners II, L.P.; 8.7% of the class
Fund shares held 588,235 shares OrbiMed Genesis Master Fund, L.P.; 0.6% of the class
IPO purchase price $17.00 per share Price paid by the funds for IPO purchases
Shares outstanding 106,801,325 shares Outstanding-share count cited from the issuer's final prospectus filed September 28, 2026
beneficial ownership regulatory
"aggregate amount beneficially owned"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
demand registration rights regulatory
"certain demand registration rights"
piggyback registration rights regulatory
"certain 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.
Lock-Up Agreement regulatory
"entered into a lock-up agreement"
A lock-up agreement is a contract that prevents company insiders and early investors from selling their shares for a fixed period after a stock sale, often after an initial public offering. It matters to investors because it temporarily limits the number of shares that can hit the market, which can keep the share price steadier; when the lock-up ends, a sudden increase in available shares can create extra volatility, revealing insiders’ confidence or lack thereof.

FAQ

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

How many ADRX shares did OrbiMed report beneficially owning?

OrbiMed Advisors LLC reported beneficial ownership of 14,913,764 shares, with shared voting and dispositive power. The disclosure also reports 14,325,529 shares held by OrbiMed Private Investments VII, LP, 9,292,025 by OrbiMed Israel Partners II, L.P., and 588,235 by OrbiMed Genesis Master Fund, L.P.; related managers and general partners may also be attributed those fund shares.

How many ADRX shares did the OrbiMed funds buy in the IPO, and at what price?

The funds purchased IPO shares at $17.00 per share: OrbiMed Private Investments VII, LP purchased 300,249 shares, OrbiMed Israel Partners II, L.P. purchased 61,516 shares, and OrbiMed Genesis Master Fund, L.P. purchased 588,235 shares.

What Form S-1 registration rights do ADRX holders have?

Beginning 180 days after the IPO registration statement's effective date, holders of at least 30% of the registrable securities then outstanding may request a Form S-1 registration for 40% of the outstanding registrable securities, with an anticipated aggregate gross public offering price of at least $15 million. The issuer is not required to act on a request if it has already effected one such registration.

What conditions apply to ADRX holders' Form S-3 registration rights?

Holders may request Form S-3 registration if the issuer is qualified to use Form S-3 and the reasonably anticipated aggregate net proceeds from the shares offered would equal or exceed $5 million. The issuer is not required to act if it has effected two Form S-3 registrations within the preceding twelve-month period.

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

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00654F105

(CUSIP Number)
OrbiMed Advisors LLC
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400


OrbiMed Capital GP VII LLC
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400


OrbiMed Advisors Israel II Ltd
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400


OrbiMed Israel GP II, L.P.
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400


OrbiMed Genesis GP LLC
601 Lexington Avenue, 54th Floor,
New York, NY, 10022
(212) 739-6400

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
09/28/2026

(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).




schemaVersion:


SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D


ORBIMED ADVISORS LLC
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Member
Date:10/02/2026
ORBIMED CAPITAL GP VII LLC
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Member of OrbiMed Advisors LLC
Date:10/02/2026
ORBIMED ADVISORS ISRAEL II LTD
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Director
Date:10/02/2026
ORBIMED ISRAEL GP II, L.P.
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Director of OrbiMed Advisors Israel II Limited
Date:10/02/2026
OrbiMed Genesis GP LLC
Signature:/s/ Carl L. Gordon
Name/Title:Carl L. Gordon/Member of OrbiMed Advisors LLC
Date:10/02/2026

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