AKTS · Aktis Oncology, Inc. · Shareholders & Ownership

$15.73 -1.03 (-6.15%) At close · Oct 23

Russell 2000 member Rebalance outlook locked

Market Cap

$874.89M

55.62M

Volume · Oct 23 241.76K Avg daily vol (3M) 364.06K

Every disclosed holder of AKTS in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns AKTS

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	115	34,279,824	61.63%	Yes
Insiders (Forms 3, 4, 5)	0	0	0.00%	No
13D/G-only blocks	1	5,829,212	10.48%	Yes
Remaining	—	15,510,463	27.89%	Rest
Registered funds (N-PORT, not summed)	110	7,111,779	12.79%	No

Shares outstanding: 55,619,499, the issuer's latest cover-page count restated onto today's split basis.

Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of AKTS

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	GADICKE ANSBERT Insider CIK 1134655 · Jan 12, 2026 Director, issuer-wide, not summed	10,260,064	18.45%	+9,918,355	Jan 12, 2026	Director, issuer-wide, not summed
2	MPM BIOVENTURES 2018, L.P. Insider CIK 1729505 · Jan 12, 2026 10% Owner, issuer-wide, not summed	10,260,064	18.45%	+9,918,355	Jan 12, 2026	10% Owner, issuer-wide, not summed
3	ELI LILLY & Co Insider CIK 59478 · Jan 12, 2026 10% Owner, issuer-wide, not summed	6,344,114	11.41%	—	Jan 12, 2026	10% Owner, issuer-wide, not summed
4	Kim Helen Susan Insider CIK 1422772 · Jan 12, 2026 Director, 10% Owner, issuer-wide, not summed	5,829,212	10.48%	—	Jan 12, 2026	Director, 10% Owner, issuer-wide, not summed
5	Vida Ventures II, LLC Insider CIK 1776851 · Jan 12, 2026 10% Owner, issuer-wide, not summed	5,829,212	10.48%	—	Jan 12, 2026	10% Owner, issuer-wide, not summed
6	VV Manager II LLC 13D CIK 1824569 · Unknown · Jan 12, 2026	5,829,212	10.48%	—	Jan 12, 2026
7	MPM BIOIMPACT LLC 13F CIK 1687078 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,835,872	8.69%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
8	EcoR1 Capital, LLC 13F CIK 1587114 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,824,469	8.67%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
8.1	EcoR1 Capital, LLC Insider CIK 1587114 · Jan 12, 2026 Director, 10% Owner, issuer-wide, not summed	4,824,469	8.67%	—	Jan 12, 2026	Director, 10% Owner, issuer-wide, not summed
9	Foley Todd Insider CIK 1473930 · Jan 12, 2026 Director, 10% Owner, issuer-wide, not summed	4,235,403	7.62%	—	Jan 12, 2026	Director, 10% Owner, issuer-wide, not summed
10	Blue Owl Capital Holdings LP 13F CIK 1858703 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,070,219	5.52%	-91,129	Jun 30, 2026	carried, not yet filed for the newest quarter
11	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	2,278,358	4.10%	+166,231	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	545,302	0.98%	+82,994	Jun 30, 2026	iShares Trust, not summed
11.2	BlackRock Health Sciences Opportunities Portfolio Fund S000001877 · Registered fund · May 29, 2026 BlackRock Funds, not summed	266,503	0.48%	0	May 29, 2026	BlackRock Funds, not summed
11.3	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	133,328	0.24%	+47,871	Jun 30, 2026	iShares Trust, not summed
11.4	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	59,825	0.11%	-20,397	Jun 30, 2026	iShares Trust, not summed
11.5	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	39,040	0.07%	+6,206	Jun 30, 2026	Quantitative Master Series LLC, not summed
12	T. Rowe Price Investment Management, Inc. 13F CIK 1897612 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,051,447	3.69%	-72,365	Jun 30, 2026	carried, not yet filed for the newest quarter
13	WELLINGTON MANAGEMENT GROUP LLP 13F CIK 902219 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,966,244	3.54%	-350,800	Jun 30, 2026	carried, not yet filed for the newest quarter
13.1	VANGUARD HEALTH CARE FUND Fund S000002922 · Registered fund · Jul 31, 2026 VANGUARD SPECIALIZED FUNDS, not summed	1,462,244	2.63%	-561,400	Jul 31, 2026	VANGUARD SPECIALIZED FUNDS, not summed
14	RTW INVESTMENTS, LP 13F CIK 1493215 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,592,043	2.86%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
15	RA CAPITAL MANAGEMENT, L.P. 13F CIK 1346824 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,314,405	2.36%	-188,679	Jun 30, 2026	carried, not yet filed for the newest quarter
16	Jupiter Topco LLC 13F CIK 2146052 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,314,267	2.36%	-140,000	Jun 30, 2026	carried, not yet filed for the newest quarter
17	BAKER BROS. ADVISORS LP 13F CIK 1263508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	996,351	1.79%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
18	Octagon Capital Advisors LP 13F CIK 1839435 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	960,847	1.73%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
19	Merck & Co., Inc. 13F CIK 310158 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	952,844	1.71%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
20	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	817,075	1.47%	-16,838	Jun 30, 2026	carried, not yet filed for the newest quarter
21	PRICE T ROWE ASSOCIATES INC /MD/ 13F CIK 80255 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	763,499	1.37%	-800,697	Jun 30, 2026	carried, not yet filed for the newest quarter
21.1	T. Rowe Price Small-Cap Stock Fund, Inc. Fund S000002120 · Registered fund · Jun 30, 2026 T. ROWE PRICE SMALL-CAP STOCK FUND, INC., not summed	676,577	1.22%	+64,030	Jun 30, 2026	T. ROWE PRICE SMALL-CAP STOCK FUND, INC., not summed
21.2	T. Rowe Price Institutional Small-Cap Stock Fund Fund S000002094 · Registered fund · Jun 30, 2026 T. Rowe Price Equity Funds, Inc., not summed	358,947	0.65%	+38,197	Jun 30, 2026	T. Rowe Price Equity Funds, Inc., not summed
21.3	T. Rowe Price Health Sciences Fund, Inc. Fund S000002088 · Registered fund · Jun 30, 2026 T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed	333,745	0.60%	0	Jun 30, 2026	T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
21.4	T. Rowe Price New Horizons Fund, Inc. Fund S000002106 · Registered fund · Jun 30, 2026 T. ROWE PRICE NEW HORIZONS FUND, INC., not summed	196,735	0.35%	-88	Jun 30, 2026	T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
21.5	T. Rowe Price Small-Cap Value Fund, Inc. Fund S000002121 · Registered fund · Jun 30, 2026 T. ROWE PRICE SMALL-CAP VALUE FUND, INC., not summed	163,403	0.29%	-40,944	Jun 30, 2026	T. ROWE PRICE SMALL-CAP VALUE FUND, INC., not summed
22	TCG Crossover Management, LLC 13F CIK 1839948 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	696,560	1.25%	+696,560	Jun 30, 2026	carried, not yet filed for the newest quarter
23	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	585,135	1.05%	-20,700	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
24	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	520,737	0.94%	+28,801	Jun 30, 2026	carried, not yet filed for the newest quarter
25	EVENTIDE ASSET MANAGEMENT, LLC 13F CIK 1442891 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	507,000	0.91%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
25.1	Eventide Healthcare & Life Sciences Fund Fund S000039514 · Registered fund · Jun 30, 2026 MUTUAL FUND SERIES TRUST, not summed	507,000	0.91%	0	Jun 30, 2026	MUTUAL FUND SERIES TRUST, not summed
26	Avidity Partners Management LP 13F CIK 1791827 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	484,200	0.87%	+15,634	Jun 30, 2026	carried, not yet filed for the newest quarter
27	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	484,010	0.87%	+55,757	Jun 30, 2026	carried, not yet filed for the newest quarter
27.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	7,100	0.01%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
27.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	488	0.00%	0	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
28	a16z Capital Management, L.L.C. 13F CIK 1540358 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	415,000	0.75%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Alyeska Investment Group, L.P. 13F CIK 1453072 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	290,000	0.52%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
30	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	285,631	0.51%	-100,748	Jun 30, 2026	carried, not yet filed for the newest quarter
30.1	Select Biotechnology Portfolio Fund S000007486 · Registered fund · May 31, 2026 Fidelity Select Portfolios, not summed	283,355	0.51%	-100,600	May 31, 2026	Fidelity Select Portfolios, not summed
30.2	Fidelity Small Cap Index Fund Fund S000033638 · Registered fund · Jul 31, 2026 Fidelity Salem Street Trust, not summed	232,435	0.42%	+29,648	Jul 31, 2026	Fidelity Salem Street Trust, not summed
30.3	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	97,084	0.17%	—	May 31, 2026	Fidelity Concord Street Trust, not summed
30.4	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	41,318	0.07%	—	May 31, 2026	Fidelity Concord Street Trust, not summed
30.5	Fidelity Nasdaq Composite Index Fund Fund S000055366 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	28,570	0.05%	+13,845	May 31, 2026	Fidelity Concord Street Trust, not summed
31	ArrowMark Colorado Holdings LLC 13F CIK 1483859 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	245,872	0.44%	-83,599	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Meridian Small Cap Growth Fund Fund S000042770 · Registered fund · Jun 30, 2026 Meridian Fund Inc, not summed	105,570	0.19%	0	Jun 30, 2026	Meridian Fund Inc, not summed
32	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	209,816	0.38%	+141	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
33	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	180,575	0.32%	+31,099	Jun 30, 2026	carried, not yet filed for the newest quarter
33.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	10,724	0.02%	+530	Jun 30, 2026	Northern Funds, not summed
33.2	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	5,193	0.01%	—	Jun 30, 2026	Northern Funds, not summed
34	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	166,842	0.30%	+4,825	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	88,457	0.16%	—	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
34.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	51,557	0.09%	+6,431	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
34.3	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	13,916	0.03%	—	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
34.4	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	13,000	0.02%	0	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
35	BARCLAYS PLC 13F CIK 312069 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	151,696	0.27%	+141,972	Jun 30, 2026	carried, not yet filed for the newest quarter
36	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	145,220	0.26%	+24,898	Jun 30, 2026	carried, not yet filed for the newest quarter
37	Feldman Paul L Insider CIK 2050705 · Jan 8, 2026 Chief Scientific Officer, issuer-wide, not summed	144,568	0.26%	—	Jan 8, 2026	Chief Scientific Officer, issuer-wide, not summed
38	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	133,834	0.24%	+6,439	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Mirador Capital Partners LP 13F CIK 1633446 · Registered investment adviser · Sep 30, 2026	133,558	0.24%	+93,434	Sep 30, 2026
40	TD Asset Management Inc 13F CIK 1056053 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	105,902	0.19%	+4,940	Jun 30, 2026	carried, not yet filed for the newest quarter
41	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	105,593	0.19%	+101,639	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
42	SOROS FUND MANAGEMENT LLC 13F CIK 1029160 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	100,000	0.18%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
43	Woodline Partners LP 13F CIK 1784547 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	100,000	0.18%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
44	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	99,960	0.18%	-253,303	Jun 30, 2026	carried, not yet filed for the newest quarter
45	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	95,400	0.17%	+95,400	Jun 30, 2026	carried, not yet filed for the newest quarter
46	RODEN MATTHEW Insider CIK 1828130 · Jan 8, 2026 Director, President and CEO, issuer-wide, not summed	91,998	0.17%	—	Jan 8, 2026	Director, President and CEO, issuer-wide, not summed
47	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	72,835	0.13%	+2,909	Jun 30, 2026	carried, not yet filed for the newest quarter
48	POLEN CAPITAL MANAGEMENT LLC 13F CIK 1034524 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	63,514	0.11%	+63,514	Jun 30, 2026	carried, not yet filed for the newest quarter
48.1	Polen 5Perspectives Small Growth Fund Fund S000059535 · Registered fund · Jul 31, 2026 FundVantage Trust, not summed	14,852	0.03%	—	Jul 31, 2026	FundVantage Trust, not summed
49	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	62,636	0.11%	+31,913	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Tidal Investments LLC 13F CIK 1600064 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	57,059	0.10%	+57,059	Jun 30, 2026	carried, not yet filed for the newest quarter

16 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 182 holders

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Key facts CIK 2035832 CUSIP 01021M104 13F (30d) 10 filings 10 filers Visit website Investor relations