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RA Capital lifts Artiva Biotherapeutics (ARTV) stake with 21,654-share buy

Filing Impact
(Moderate)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

Entities affiliated with RA Capital Management reported open-market purchases of a total of 21,654 shares of Artiva Biotherapeutics common stock on 2026-07-10 and 2026-07-13 at weighted-average prices of $8.9700 and $8.9400 per share. After these trades they report 16,817,573.0000 shares of common stock held indirectly across several managed funds and a separately managed account, while disclaiming beneficial ownership beyond their pecuniary interests.

Positive

  • None.

Negative

  • None.
Insider RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund, L.P., RA Capital Nexus Fund III, L.P., Kolchinsky Peter, Shah Rajeev M.
Role Director, 10% Owner | Director, 10% Owner | Director | Director | Director, 10% Owner | Director, 10% Owner
Bought 21,654 shs ($194K)
Type Security Shares Price Value
Purchase Common Stock F4, F2, F3 6,552 $8.94 $59K
Purchase Common Stock F1, F2, F3 15,102 $8.97 $135K
holding Common Stock F2, F5 -- -- --
holding Common Stock F2, F6 -- -- --
holding Common Stock F2, F7 -- -- --
Holdings After Transaction: Common Stock — 17,977,296 shares (Indirect, See footnotes)
Footnotes (7)
  1. F1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.89 to $9.00 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
  2. F2. RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund, L.P. (the "Nexus Fund"), RA Capital Nexus III Fund, L.P. (the "Nexus Fund III"), and a separately managed account (the "Account"). 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. The Adviser, the Adviser GP, the Fund, the Nexus Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
  3. F3. Held directly by the Fund.
  4. F4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.89 to $8.95 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
  5. F5. Held directly by the Nexus Fund.
  6. F6. Held directly by Nexus Fund III.
  7. F7. Held directly by the Account.
Shares purchased on 2026-07-13 6552.0000 shares Open-market purchase of common stock at $8.9400 per share on 2026-07-13
Shares purchased on 2026-07-10 15102.0000 shares Open-market purchase of common stock at $8.9700 per share on 2026-07-10
Net additional shares acquired 21654 shares Total common shares bought across reported open-market transactions
Indirect holdings after latest trade 16817573.0000 shares Total common stock reported as indirectly owned following 2026-07-13 purchase
Indirect holding position 68320.0000 shares One of several indirectly held common stock positions as of 2026-07-10
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
investment manager financial
"RA Capital Management, L.P. (the "Adviser") is the investment manager"
separately managed account financial
"and a separately managed account (the "Account")."
A separately managed account (SMA) is a personalized investment portfolio owned by a single investor and run by a professional manager who buys and sells securities on that investor’s behalf. It matters to investors because an SMA offers tailored asset selection, tax handling, and transparency—like hiring a personal chef who prepares meals to your dietary needs rather than sharing a set menu—so you can align holdings with your goals and see exactly what you own.
pecuniary interest financial
"disclaim beneficial ownership ... except to the extent of their pecuniary interest therein."
indirect ownership financial
"ownership_type" : "indirect" for the reported common stock holdings"

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

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FAQ

What insider transaction did RA Capital report in Artiva Biotherapeutics (ARTV)?
RA Capital-affiliated entities reported open-market purchases totaling 21,654 shares of Artiva Biotherapeutics common stock. The trades occurred on 2026-07-10 and 2026-07-13, at weighted-average prices of $8.9700 and $8.9400 per share, respectively, and are reported as indirect ownership.

How many ARTV shares do RA Capital affiliates indirectly hold after these transactions?
Following the reported purchases, RA Capital-affiliated entities report indirect ownership of 16,817,573.0000 shares of Artiva Biotherapeutics common stock. Additional indirectly held positions of 68,320.0000, 826,832.0000, and 264,571.0000 shares are also disclosed through related investment vehicles and a separately managed account.

At what prices did RA Capital buy Artiva Biotherapeutics (ARTV) shares?
The entities reported weighted-average purchase prices of $8.9700 per share on 2026-07-10 and $8.9400 per share on 2026-07-13. Footnotes state the 2026-07-10 trades ranged from $8.89 to $8.95, and the 2026-07-13 trades ranged from $8.89 to $9.00.

Who are the reporting persons in the Artiva Biotherapeutics (ARTV) Form 4?
The reporting persons are RA Capital Management, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund, L.P., RA Capital Nexus Fund III, L.P., and individuals Peter Kolchinsky and Rajeev M. Shah, who are managing members of the adviser’s general partner.

How are the ARTV shares held by RA Capital entities structured?
RA Capital Management, L.P. acts as investment manager for the Fund, Nexus Fund, Nexus Fund III, and a separately managed account. Footnotes state certain shares are held directly by each vehicle, while the adviser and individuals disclaim beneficial ownership beyond their pecuniary interest.

Do RA Capital and its principals claim full beneficial ownership of their ARTV holdings?
No. The adviser, its general partner, the funds, and individuals disclaim beneficial ownership of the reported Artiva Biotherapeutics securities, except to the extent of their pecuniary interest in those holdings, as explicitly stated in the footnotes describing their investment management and ownership structure.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
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. Issuer Name and Ticker or Trading Symbol
Artiva Biotherapeutics, Inc. [ ARTV ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/10/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock07/10/2026P15,102A$8.97(1)16,811,021ISee footnotes(2)(3)
Common Stock07/13/2026P6,552A$8.94(4)16,817,573ISee footnotes(2)(3)
Common Stock264,571ISee footnotes(2)(5)
Common Stock826,832ISee footnotes(2)(6)
Common Stock68,320ISee footnotes(2)(7)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
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
XDirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
RA Capital Healthcare Fund LP
(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
XDirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
RA Capital Nexus Fund, 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 Nexus Fund III, 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*
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
XDirectorX10% 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
XDirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.89 to $9.00 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
2. RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund, L.P. (the "Nexus Fund"), RA Capital Nexus III Fund, L.P. (the "Nexus Fund III"), and a separately managed account (the "Account"). 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. The Adviser, the Adviser GP, the Fund, the Nexus Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
3. Held directly by the Fund.
4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.89 to $8.95 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
5. Held directly by the Nexus Fund.
6. Held directly by Nexus Fund III.
7. Held directly by the Account.
Remarks:
Laura Stoppel, a Principal of the Adviser, serves on the Issuer's board of directors
/s/ Peter Kolchinsky, Manager of RA Capital Management, L.P.07/14/2026
/s/ Peter Kolchinsky, Manager of RA Capital Healthcare Fund GP, LLC, the General Partner of RA Capital Healthcare Fund, L.P.07/14/2026
/s/ Peter Kolchinsky, Manager of RA Capital Nexus Fund GP, LLC, the General Partner of RA Capital Nexus Fund, L.P.07/14/2026
/s/ Peter Kolchinsky, Manager of RA Capital Nexus Fund III GP, LLC, the General Partner of RA Capital Nexus Fund III, L.P.07/14/2026
/s/ Peter Kolchinsky, individually07/14/2026
/s/ Rajeev Shah, individually07/14/2026
** 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 4 (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 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR