EcoR1 Capital, LLC - 12 Jan 2026 Form 4 Insider Report for Aktis Oncology, Inc. (AKTS)

Role
Director
Signature
/s/ Oleg Nodelman, Individually, and as Manager of EcoR1 Capital, LLC
Issuer symbol
AKTS
Transactions as of
12 Jan 2026
Net transactions value
+$39,999,996
Form type
4
Filing time
12 Jan 2026, 20:28:36 UTC
Previous filing
08 Jan 2026
SEC
View on sec.gov

Reporting Owners (2)

Name Relationship Address Signature Signature date CIK
EcoR1 Capital, LLC Director 357 TEHAMA STREET #3, SAN FRANCISCO /s/ Oleg Nodelman, Individually, and as Manager of EcoR1 Capital, LLC 12 Jan 2026 0001587114
NODELMAN OLEG Director 357 TEHAMA STREET #3, SAN FRANCISCO /s/ Oleg Nodelman, Individually, and as Manager of EcoR1 Capital, LLC 12 Jan 2026 0001454385

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AKTS Common Stock Conversion of derivative security +2,270,879 2,270,879 12 Jan 2026 See Note F1, F2
transaction AKTS Common Stock Conversion of derivative security +202,862 202,862 12 Jan 2026 See Note F1, F3
transaction AKTS Common Stock Conversion of derivative security +128,506 128,506 12 Jan 2026 See Note F1, F4
transaction AKTS Common Stock Purchase $37,400,022 +2,077,779 +91% $18.00 4,348,658 12 Jan 2026 See Note F2
transaction AKTS Common Stock Purchase $2,599,974 +144,443 +71% $18.00 347,305 12 Jan 2026 See Note F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction AKTS Series A Redeemable Convertible Preferred Stock Conversion of derivative security -9,913,810 -100% 0 12 Jan 2026 Common Stock 2,605,878 See note F1, F2
transaction AKTS Series A Redeemable Convertible Preferred Stock Conversion of derivative security -997,299 -100% 0 12 Jan 2026 Common Stock 262,142 See note F1, F3
transaction AKTS Series A Redeemable Convertible Preferred Stock Conversion of derivative security -488,891 -100% 0 12 Jan 2026 Common Stock 128,506 See note F1, F4
transaction AKTS Series B Redeemable Convertible Preferred Stock Conversion of derivative security -2,397,500 -100% 0 12 Jan 2026 Common Stock 630,191 See note F1, F2
transaction AKTS Series B Redeemable Convertible Preferred Stock Conversion of derivative security -102,500 -100% 0 12 Jan 2026 Common Stock 26,942 See note F1, F3
transaction AKTS Class A Common Stock Conversion of derivative security +965,190 965,190 12 Jan 2026 Common Stock 965,190 See note F1, F2, F5
transaction AKTS Class A Common Stock Conversion of derivative security +86,222 86,222 12 Jan 2026 Common Stock 86,222 See Note F1, F3, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.
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.
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.
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.
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.

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.