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Parabilis Medicines (PBLS) RA Capital affiliates list sizable preferred stakes

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Parabilis Medicines, Inc. directors and affiliated RA Capital entities filed an initial statement of beneficial ownership showing indirect holdings of preferred stock that can convert into Voting Common Stock. The filing lists 1,083,130 underlying shares from Series F Preferred Stock and another 6,137,734 underlying shares from a separate Series F position. It also reports 104,751 and 419,006 underlying Voting Common Stock shares from two Series E Preferred Stock positions. Footnotes state each Series E share converts on a 1 to 0.6524 basis and each Series F share on a 1 to 0.6498 basis, at the option of the holder, and that all such preferred stock will automatically convert into the listed numbers of common shares immediately before the IPO without payment of consideration. The RA Capital adviser, its funds and managing members disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests.

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Insider RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund III, L.P., Kolchinsky Peter, Shah Rajeev M.
Role null | null | null | null | null
Type Security Shares Price Value
holding Series E Preferred Stock -- -- --
holding Series E Preferred Stock -- -- --
holding Series F Preferred Stock -- -- --
holding Series F Preferred Stock -- -- --
Holdings After Transaction: Series E Preferred Stock — 419,006 shares (Indirect, See footnotes); Series F Preferred Stock — 6,137,734 shares (Indirect, See footnotes)
Footnotes (1)
  1. Each share of Series E Preferred Stock is convertible into Common Stock on a 1 to 0.6524 basis at any time at the option of the holder, and will automatically convert into the number of shares shown in Column 3 immediately prior to the closing of the IPO and without payment of consideration. The Series E Preferred Stock has no expiration date. RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund") and RA Capital Nexus Fund III, L.P. (the "Nexus Fund III"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein. Held directly by the Fund. Held directly by Nexus Fund III. Each share of Series F Preferred Stock is convertible into Common Stock on a 1 to 0.6498 basis at any time at the option of the holder, and will automatically convert into the number of shares shown in Column 3 immediately prior to the closing of the IPO and without payment of consideration. The Series F Preferred Stock has no expiration date.
Series F underlying common 1,083,130 shares Underlying Voting Common Stock from one Series F Preferred position
Series F underlying common (second) 6,137,734 shares Underlying Voting Common Stock from second Series F Preferred position
Series E underlying common 104,751 shares Underlying Voting Common Stock from one Series E Preferred position
Series E underlying common (second) 419,006 shares Underlying Voting Common Stock from second Series E Preferred position
Series E conversion ratio 1 to 0.6524 Each Series E share converts into 0.6524 Common Stock shares
Series F conversion ratio 1 to 0.6498 Each Series F share converts into 0.6498 Common Stock shares
Exercise price $0.0000 Conversion/exercise price for the preferred stock into Voting Common Stock
Series E Preferred Stock financial
"Each share of Series E Preferred Stock is convertible into Common Stock on a 1 to 0.6524 basis"
Series E preferred stock is a specific class of company shares created in a later funding round that gives holders priority over common shareholders for payments and assets, often including a fixed dividend and special conversion or voting rights. Think of it as a VIP ticket that gets paid first and may convert into regular shares later; investors watch these terms because they affect potential returns, risk in a sale or bankruptcy, and control of the company.
Series F Preferred Stock financial
"Each share of Series F Preferred Stock is convertible into Common Stock on a 1 to 0.6498 basis"
Series F preferred stock is a class of company shares that gives holders priority over common shareholders for dividend payments and for getting money back if the company is sold or liquidated, much like a ticket that moves you to the front of the line. These shares often carry a fixed dividend and special rights—sometimes including conversion into common stock—so investors consider them when weighing income, downside protection and potential ownership dilution.
Voting Common Stock financial
"underlying_security_title: "Voting Common Stock""
pecuniary interest financial
"disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein"
beneficial ownership financial
"disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein"
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.
IPO financial
"will automatically convert into the number of shares shown in Column 3 immediately prior to the closing of the IPO"
An initial public offering (IPO) is the process by which a private company sells its shares to the public for the first time, making its ownership available on the stock market. This allows the company to raise money from a wide range of investors to fund growth or other goals. For investors, an IPO offers a chance to buy into a company early in its public journey, potentially benefiting if the company grows in value.
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SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
RA CAPITAL MANAGEMENT, L.P.

(Last)(First)(Middle)
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
06/09/2026
3. Issuer Name and Ticker or Trading Symbol
Parabilis Medicines, Inc. [ PBLS ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Series E Preferred Stock (1) (1)Voting Common Stock419,006(1)ISee footnotes(2)(3)
Series E Preferred Stock (1) (1)Voting Common Stock104,751(1)ISee footnotes(2)(4)
Series F Preferred Stock (5) (5)Voting Common Stock6,137,734(5)ISee footnotes(2)(3)
Series F Preferred Stock (5) (5)Voting Common Stock1,083,130(5)ISee footnotes(2)(4)
1. Name and Address of Reporting Person*
RA CAPITAL MANAGEMENT, L.P.

(Last)(First)(Middle)
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
XDirector10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
RA Capital Healthcare Fund LP

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
XDirector10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
RA Capital Nexus Fund III, L.P.

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
XDirector10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Kolchinsky Peter

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
XDirector10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Shah Rajeev M.

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
XDirector10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. Each share of Series E Preferred Stock is convertible into Common Stock on a 1 to 0.6524 basis at any time at the option of the holder, and will automatically convert into the number of shares shown in Column 3 immediately prior to the closing of the IPO and without payment of consideration. The Series E Preferred Stock has no expiration date.
2. RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund") and RA Capital Nexus Fund III, L.P. (the "Nexus Fund III"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein.
3. Held directly by the Fund.
4. Held directly by Nexus Fund III.
5. Each share of Series F Preferred Stock is convertible into Common Stock on a 1 to 0.6498 basis at any time at the option of the holder, and will automatically convert into the number of shares shown in Column 3 immediately prior to the closing of the IPO and without payment of consideration. The Series F Preferred Stock has no expiration date.
Remarks:
Dr. Jake Simson, a Partner of the Adviser, serves on the Issuer's board of directors.
/s/ Peter Kolchinsky, Manager of RA Capital Management, L.P.06/09/2026
/s/ Peter Kolchinsky, Manager of RA Capital Healthcare Fund GP, LLC, the General Partner of RA Capital Healthcare Fund, L.P.06/09/2026
/s/ Peter Kolchinsky, Manager of RA Capital Nexus Fund III GP, LLC, the General Partner of RA Capital Nexus Fund III, L.P.06/09/2026
/s/ Peter Kolchinsky, individually06/09/2026
/s/ Rajeev Shah, individually06/09/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does the PBLS Form 3 filing by RA Capital report?

The Form 3 reports RA Capital–affiliated entities’ indirect holdings of Parabilis Medicines preferred stock that is convertible into Voting Common Stock, establishing their initial ownership position and how many common shares the Series E and Series F preferred could become.

How many PBLS common shares underlie the Series F Preferred Stock holdings?

The filing lists two Series F Preferred Stock positions, corresponding to 1,083,130 and 6,137,734 underlying shares of Voting Common Stock. These amounts reflect how many common shares the preferred stock will become upon automatic conversion before the IPO.

What are the conversion terms for PBLS Series E and Series F Preferred Stock?

Each Series E Preferred Stock share converts into Common Stock on a 1 to 0.6524 basis, and each Series F converts on a 1 to 0.6498 basis. Both series are convertible at the holder’s option and automatically convert into the stated common share amounts before the IPO.

Do the RA Capital entities claim full beneficial ownership of PBLS shares?

No. The adviser, its general partner, the healthcare fund, the Nexus Fund III, and the two managing members each disclaim beneficial ownership of the reported securities, except to the extent of their respective pecuniary interest in the Parabilis Medicines holdings.

Who directly holds the PBLS preferred stock referenced in the Form 3?

Footnotes explain that certain reported securities are held directly by RA Capital Healthcare Fund, L.P. and others by RA Capital Nexus Fund III, L.P. The investment adviser and individuals are associated with these funds but report the positions as indirect holdings.