Vida Ventures II, LLC - 12 Jan 2026 Form 4 Insider Report for Aktis Oncology, Inc. (AKTS)

Role: 10%+ Owner
Signature: VIDA VENTURES II, LLC, By: VV Manager II, LLC, its Manager, By: /s/ Jean-Philippe Kouakou-Zebouah, Authorized Signatory
Issuer symbol: AKTS
Transactions as of: 12 Jan 2026
Net transactions value: +$15,030,000
Form type: 4
Filing time: 12 Jan 2026, 17:10:07 UTC
Previous filing: 08 Jan 2026
SEC: View on sec.gov

Reporting Owners (2)

Name	Relationship	Address	Signature	Signature date	CIK
Vida Ventures II, LLC	10%+ Owner	C/O VIDA VENTURES ADVISORS, LLC, 10100 SANTA MONICA BOULEVARD, SUITE 1500, LOS ANGELES	VIDA VENTURES II, LLC, By: VV Manager II, LLC, its Manager, By: /s/ Jean-Philippe Kouakou-Zebouah, Authorized Signatory	12 Jan 2026	0001776851
VIDA VENTURES II-A, LLC	10%+ Owner	10100 SANTA MONICA BOULEVARD.,, SUITE 1500, LOS ANGELES	VIDA VENTURES II-A, LLC, By: VV Manager II, LLC, its Manager, By: /s/ Jean-Philippe Kouakou-Zebouah, Authorized Signatory	12 Jan 2026	0001781930

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AKTS	Common Stock	Conversion of derivative security		+4,859,370			4,859,370	12 Jan 2026	See Footnote	F1, F2
transaction	AKTS	Common Stock	Purchase	$14,624,190	+812,455	+17%	$18.00	5,671,825	12 Jan 2026	See Footnote	F2
transaction	AKTS	Common Stock	Conversion of derivative security		+134,842			134,842	12 Jan 2026	See Footnote	F1, F3
transaction	AKTS	Common Stock	Purchase	$405,810	+22,545	+17%	$18.00	157,387	12 Jan 2026	See Footnote	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	$0	-14,838,250	-100%	$0.000000	0	12 Jan 2026	Common Stock	3,900,284		See Footnote	F2, F4
transaction	AKTS	Series A Redeemable Convertible Preferred Stock	Conversion of derivative security	$0	-411,750	-100%	$0.000000	0	12 Jan 2026	Common Stock	108,229		See Footnote	F3, F4
transaction	AKTS	Series B Redeemable Convertible Preferred Stock	Conversion of derivative security	$0	-3,648,750	-100%	$0.000000	0	12 Jan 2026	Common Stock	959,086		See Footnote	F2, F5
transaction	AKTS	Series B Redeemable Convertible Preferred Stock	Conversion of derivative security	$0	-101,250	-100%	$0.000000	0	12 Jan 2026	Common Stock	26,613		See Footnote	F3, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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.
F3	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.
F4	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.
F5	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.