Key facts
- This page summarizes EcoR1 Capital, LLC's Form 4 filing for Aktis Oncology, Inc. (AKTS).
- 12 reported transactions and 7 derivative rows are listed below.
- Accepted by SEC: 12 Jan 2026, 20:28.
EcoR1 Capital, LLC - 12 Jan 2026 Form 4 Insider Report for Aktis Oncology, Inc. (AKTS)
- Reporting relationship
- Director
- Issuer ticker
- AKTS
- Reported as of
- 12 Jan 2026
- Net transaction value
- +$39,999,996
- SEC form
- 4
- Accepted by SEC
- 12 Jan 2026, 20:28:36 UTC
- Prior SEC filing
- 08 Jan 2026
- Next SEC filing
- 22 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Oleg Nodelman, Individually, and as Manager of EcoR1 Capital, LLC
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
EcoR1 Capital, LLC filed Form 4 for Aktis Oncology, Inc. (AKTS) on 12 Jan 2026.
Change
- Previous filing in this sequence was filed on 08 Jan 2026.
- Current net transaction value: +$39,999,996.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (2)
CIK 0001587114
Primary reporting owner
EcoR1 Capital, LLC
- Relationship
- Director
- Address
- 357 TEHAMA STREET #3, SAN FRANCISCO
- Signature
- /s/ Oleg Nodelman, Individually, and as Manager of EcoR1 Capital, LLC
- Signature date
- 12 Jan 2026
CIK 0001454385
NODELMAN OLEG
- Relationship
- Director
- Address
- 357 TEHAMA STREET #3, SAN FRANCISCO
- Signature
- /s/ Oleg Nodelman, Individually, and as Manager of EcoR1 Capital, LLC
- Signature date
- 12 Jan 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
AKTS
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +2,270,879
- Change %
- Price
- Shares after
- 2,270,879
- Date
- 12 Jan 2026
- Ownership
- See Note
- Footnotes
- F1, F2
AKTS
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +202,862
- Change %
- Price
- Shares after
- 202,862
- Date
- 12 Jan 2026
- Ownership
- See Note
- Footnotes
- F1, F3
AKTS
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +128,506
- Change %
- Price
- Shares after
- 128,506
- Date
- 12 Jan 2026
- Ownership
- See Note
- Footnotes
- F1, F4
AKTS
transaction
Common Stock
Purchase
- Transaction value
- $37,400,022
- Shares
- +2,077,779
- Change %
- +91%
- Price
- $18.00
- Shares after
- 4,348,658
- Date
- 12 Jan 2026
- Ownership
- See Note
- Footnotes
- F2
AKTS
transaction
Common Stock
Purchase
- Transaction value
- $2,599,974
- Shares
- +144,443
- Change %
- +71%
- Price
- $18.00
- Shares after
- 347,305
- Date
- 12 Jan 2026
- Ownership
- See Note
- Footnotes
- F3
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
AKTS
transaction
Derivative
Series A Redeemable Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -9,913,810
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 12 Jan 2026
- Ownership
- See note
- Underlying class
- Common Stock
- Underlying amount
- 2,605,878
- Exercise price
- Footnotes
- F1, F2
AKTS
transaction
Derivative
Series A Redeemable Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -997,299
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 12 Jan 2026
- Ownership
- See note
- Underlying class
- Common Stock
- Underlying amount
- 262,142
- Exercise price
- Footnotes
- F1, F3
AKTS
transaction
Derivative
Series A Redeemable Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -488,891
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 12 Jan 2026
- Ownership
- See note
- Underlying class
- Common Stock
- Underlying amount
- 128,506
- Exercise price
- Footnotes
- F1, F4
AKTS
transaction
Derivative
Series B Redeemable Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -2,397,500
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 12 Jan 2026
- Ownership
- See note
- Underlying class
- Common Stock
- Underlying amount
- 630,191
- Exercise price
- Footnotes
- F1, F2
AKTS
transaction
Derivative
Series B Redeemable Convertible Preferred Stock
Conversion of derivative security
- Transaction value
- Shares
- -102,500
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 12 Jan 2026
- Ownership
- See note
- Underlying class
- Common Stock
- Underlying amount
- 26,942
- Exercise price
- Footnotes
- F1, F3
AKTS
transaction
Derivative
Class A Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +965,190
- Change %
- Price
- Shares after
- 965,190
- Date
- 12 Jan 2026
- Ownership
- See note
- Underlying class
- Common Stock
- Underlying amount
- 965,190
- Exercise price
- Footnotes
- F1, F2, F5
AKTS
transaction
Derivative
Class A Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +86,222
- Change %
- Price
- Shares after
- 86,222
- Date
- 12 Jan 2026
- Ownership
- See Note
- Underlying class
- Common Stock
- Underlying amount
- 86,222
- Exercise price
- Footnotes
- F1, F3, F5
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 5 footnotes
Footnote F1
The shares of Series A Redeemable Convertible Preferred Stock and Series B Redeemable Convertible Preferred Stock converted into shares of Common Stock and Class A Common Stock on a 3.8044-for-1 basis immediately prior to the closing of the initial public offering of the Issuer's Common Stock for no additional consideration. Each share was immediately exercisable and had no expiration date.
Footnote F2
These securities are held by EcoR1 Capital Fund Qualified, L.P. ("Qualified Fund"). EcoR1 Capital, LLC ("EcoR1") may be deemed to indirectly beneficially own them as the investment adviser to and general partner of the fund. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1.
Footnote F3
These securities are held by EcoR1 Capital Fund, L.P. ("Capital Fund"). EcoR1 may be deemed to indirectly beneficially own them as the investment adviser to and general partner of the fund. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1.
Footnote F4
These securities are held by EcoR1 Venture Opportunity Fund, L.P. ("Venture Fund"). EcoR1 may be deemed to indirectly beneficially own them as the investment adviser to and general partner of the fund. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1.
Footnote F5
Each share of Class A Common Stock is convertible into one share of Common Stock at the election of the holder for no additional consideration, subject to a 4.99% beneficial ownership limitation. Each share is immediately exercisable and has no expiration date.
SEC remarks
EcoR1 is the general partner and investment adviser of private funds, including Qualified Fund, Capital Fund and Venture Fund. Mr. Nodelman is a director of the Issuer and is the manager and controlling owner of EcoR1. The reporting persons are filing this Form 4 jointly, but not as a group, and each expressly disclaims membership in a group within the meaning of Rule 13d-5(b) under the Securities Exchange Act of 1934. The reporting persons disclaim beneficial ownership of the securities reported herein, except to the extent of their respective pecuniary interests therein.