Aktis Oncology, Inc. (Form: 4, Received: 01/12/2026 17:10:31)

FORM 4 ☐ 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^* Vida Ventures II, LLC	2. Issuer Name and Ticker or Trading Symbol Aktis Oncology, Inc. [ AKTS ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below)
(Last) (First) (Middle) C/O VIDA VENTURES ADVISORS, LLC, 10100 SANTA MONICA BOULEVARD, SUITE 1500	3. Date of Earliest Transaction (MM/DD/YYYY) 1/12/2026
(Street) LOS ANGELES, CA 90067	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ Form filed by More than One Reporting Person
(City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	1/12/2026		C⁽¹⁾		4,859,370	A	⁽¹⁾	4,859,370	I	See Footnote ⁽²⁾
Common Stock	1/12/2026		P		812,455	A	$18	5,671,825	I	See Footnote ⁽²⁾
Common Stock	1/12/2026		C⁽¹⁾		134,842	A	⁽¹⁾	134,842	I	See Footnote ⁽³⁾
Common Stock	1/12/2026		P		22,545	A	$18	157,387	I	See Footnote ⁽³⁾

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)
Series A Redeemable Convertible Preferred Stock	⁽⁴⁾	1/12/2026		C			14,838,250	⁽⁴⁾	⁽⁴⁾	Common Stock	3,900,284	$0	0	I	See Footnote ⁽²⁾
Series A Redeemable Convertible Preferred Stock	⁽⁴⁾	1/12/2026		C			411,750	⁽⁴⁾	⁽⁴⁾	Common Stock	108,229	$0	0	I	See Footnote ⁽³⁾
Series B Redeemable Convertible Preferred Stock	⁽⁵⁾	1/12/2026		C			3,648,750	⁽⁵⁾	⁽⁵⁾	Common Stock	959,086	$0	0	I	See Footnote ⁽²⁾
Series B Redeemable Convertible Preferred Stock	⁽⁵⁾	1/12/2026		C			101,250	⁽⁵⁾	⁽⁵⁾	Common Stock	26,613	$0	0	I	See Footnote ⁽³⁾

Explanation of Responses:
(1)	Represents shares of the Issuer's Common Stock received upon conversion of shares of the Series A Redeemable Convertible Preferred Stock and Series B Redeemable Convertible Preferred Stock on a 3.8044-for-1 basis without payment of additional consideration.
(2)	These shares are held by Vida Ventures II, LLC ("VV II"). VV Manager II, LLC ("VVM II") is the manager of VV II and may be deemed to have voting, investment and dispositive power with respect to the shares held by VV II. Arie Belldegrun, Fred Cohen, and Leonard Potter, the members of the management committee of VVM II, along with the other members of the investment committee of VVM II, Rajul Jain, Joshua Kazam, and Helen Kim, a member of the Issuer's board of directors, may be deemed to share voting, investment and dispositive power over the shares held by VV II and each such person disclaims beneficial ownership of the securities except to the extent of such person's pecuniary interest therein.
(3)	These shares are held by Vida Ventures II-A, LLC ("VV II-A"). VVM II is the manager of VV II-A and may be deemed to have voting, investment and dispositive power with respect to the shares held by VV II-A. Arie Belldegrun, Fred Cohen, and Leonard Potter, the members of the management committee of VVM II, along with the other members of the investment committee of VVM II, Rajul Jain, Joshua Kazam, and Helen Kim, a member of the Issuer's board of directors, may be deemed to share voting, investment and dispositive power over the shares held by VV II-A and each such person disclaims beneficial ownership of the securities except to the extent of such person's pecuniary interest therein.
(4)	The Series A Redeemable Convertible Preferred Stock had no expiration date and automatically converted into the Issuer's Common Stock on a 3.8044-for-1 basis immediately prior to the closing of the Issuer's initial public offering of its Common Stock without payment of additional consideration.
(5)	The Series B Redeemable Convertible Preferred Stock had no expiration date and automatically converted into the Issuer's Common Stock on a 3.8044-for-1 basis immediately prior to the closing of the Issuer's initial public offering of its Common Stock without payment of additional consideration.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Vida Ventures II, LLC C/O VIDA VENTURES ADVISORS, LLC 10100 SANTA MONICA BOULEVARD, SUITE 1500 LOS ANGELES, CA 90067		X
VIDA VENTURES II-A, LLC 10100 SANTA MONICA BOULEVARD., SUITE 1500 LOS ANGELES, CA 90067		X

Signatures
VIDA VENTURES II, LLC, By: VV Manager II, LLC, its Manager, By: /s/ Jean-Philippe Kouakou-Zebouah, Authorized Signatory		1/12/2026
^**Signature of Reporting Person		Date
VIDA VENTURES II-A, LLC, By: VV Manager II, LLC, its Manager, By: /s/ Jean-Philippe Kouakou-Zebouah, Authorized Signatory		1/12/2026
^**Signature of Reporting Person		Date

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 control number.