Aktis Oncology, Inc.: which funds bought and sold

Institutions that bought and sold Aktis Oncology shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 78 institutions that filed 13F reports for both quarters added to or opened positions in Aktis Oncology, and 24 cut or closed them. Together they sold a net 870K shares, −2.6% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 1.5M shares (−9.5%); index fund managers were net buyers of 307K shares (+6.9%). 51 opened a new position and 6 sold out entirely.

Bought, Q2 2026 78 institutions, 51 of them new holders Sold, Q2 2026 24 institutions, 6 of them sold out

Net change, all compared −870K shares (−2.6%)

Net change, active managers −1.5M shares (−9.5%), 8 bought, 10 sold

Buyers versus sellers

institutions compared, 118

78 bought 16 24 sold

Active managers and hedge funds 8 bought · 10 sold · −1.5M

Index fund managers 8 bought · 1 sold · +307K

Other institutions 62 bought · 13 sold · +355K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Tcg Crossover Management, LLC	+697K New position	697K	$22.5M
Blackrock, Inc. Index funds	+166K +7.9%	2.3M	$73.4M
Barclays PLC	+142K +1460.0%	152K	$4.9M
Renaissance Technologies LLC Hedge fund	+95K New position	95K	$3.1M
Polen Capital Management LLC Active manager	+64K New position	64K	$2M
Tidal Investments LLC	+57K New position	57K	$1.8M
State Street Corp Index funds	+56K +13.0%	484K	$15.6M
Raymond James Financial Inc	+50K New position	50K	$1.6M
AQR Capital Management LLC Hedge fund	+48K New position	48K	$1.6M
Quantinno Capital Management LP	+47K New position	47K	$1.5M
Great Lakes Advisors, LLC	+44K New position	44K	$1.4M
Mirador Capital Partners LP	+40K New position	40K	$1.3M
Squarepoint Ops LLC Hedge fund	+38K New position	38K	$1.2M
Jump Financial, LLC	+33K New position	33K	$1.1M
Sofinnova Investments, Inc.	+32K New position	32K	$1M
Morgan Stanley	+32K +103.9%	63K	$2M
Northern Trust Corp Index funds	+31K +20.8%	181K	$5.8M
Two Sigma Investments, LP Hedge fund	+31K New position	31K	$996,358
Geode Capital Management, LLC Index funds	+29K +5.9%	521K	$16.8M
Nuveen, LLC	+25K +103.6%	50K	$1.6M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Renaissance Technologies LLC Hedge fund	+95K New position	95K	$3.1M
Polen Capital Management LLC Active manager	+64K New position	64K	$2M
AQR Capital Management LLC Hedge fund	+48K New position	48K	$1.6M
Squarepoint Ops LLC Hedge fund	+38K New position	38K	$1.2M
Two Sigma Investments, LP Hedge fund	+31K New position	31K	$996,358
Tudor Investment Corp Et Al Hedge fund	+21K New position	21K	$689,786
Los Angeles Capital Management LLC Active manager	+14K New position	14K	$463,435
Freestone Grove Partners LP Hedge fund	+2 New position	2	$64

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Price T Rowe Associates Inc Active manager	−801K −51.2%	763K	$24.6M
Avidity Partners Management LP	−453K −48.3%	484K	$15.6M
Wellington Management Group LLP Active manager	−351K −15.1%	2.0M	$63.4M
UBS Group AG	−253K −71.7%	100K	$3.2M
RA Capital Management, L.P. Hedge fund	−189K −12.6%	1.3M	$42.4M
Driehaus Capital Management LLC Active manager	−150K Sold out	0	—
FMR LLC Active manager	−101K −26.1%	286K	$9.2M
Laurion Capital Management LP Hedge fund	−100K Sold out	0	—
Blue Owl Capital Holdings LP	−91K −2.9%	3.1M	$99M
Arrowmark Colorado Holdings LLC	−84K −25.4%	246K	$7.9M
Ameriprise Financial Inc	−83K −80.6%	20K	$644,600
T. Rowe Price Investment Management, Inc. Active manager	−72K −3.4%	2.1M	$66.1M
Citadel Advisors LLC Hedge fund	−49K −66.0%	26K	$823,058
D. E. Shaw & Co., Inc. Hedge fund	−17K Sold out	0	—
Vanguard Capital Management LLC Index funds	−17K −2.0%	817K	$26.3M
Zimmer Partners, LP Hedge fund	−15K Sold out	0	—
Universal- Beteiligungs- Und Servicegesellschaft Mbh	−14K Sold out	0	—
Xtx Topco Ltd	−14K Sold out	0	—
Goldman Sachs Group Inc	−8,885 −29.5%	21K	$685,790
Vanguard Global Advisers, LLC	−2,803 −28.9%	6,886	$221,936

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Price T Rowe Associates Inc Active manager	−801K −51.2%	763K	$24.6M
Wellington Management Group LLP Active manager	−351K −15.1%	2.0M	$63.4M
RA Capital Management, L.P. Hedge fund	−189K −12.6%	1.3M	$42.4M
Driehaus Capital Management LLC Active manager	−150K Sold out	0	—
FMR LLC Active manager	−101K −26.1%	286K	$9.2M
Laurion Capital Management LP Hedge fund	−100K Sold out	0	—
T. Rowe Price Investment Management, Inc. Active manager	−72K −3.4%	2.1M	$66.1M
Citadel Advisors LLC Hedge fund	−49K −66.0%	26K	$823,058
D. E. Shaw & Co., Inc. Hedge fund	−17K Sold out	0	—
Zimmer Partners, LP Hedge fund	−15K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
Tcg Crossover Management, LLC	697K	$22.5M
Renaissance Technologies LLCHedge fund	95K	$3.1M
Polen Capital Management LLCActive manager	64K	$2M
Tidal Investments LLC	57K	$1.8M
Raymond James Financial Inc	50K	$1.6M
AQR Capital Management LLCHedge fund	48K	$1.6M
Quantinno Capital Management LP	47K	$1.5M
Great Lakes Advisors, LLC	44K	$1.4M
Mirador Capital Partners LP	40K	$1.3M
Squarepoint Ops LLCHedge fund	38K	$1.2M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Driehaus Capital Management LLCActive manager	150K	$2.7M
Laurion Capital Management LPHedge fund	100K	$1.8M
D. E. Shaw & Co., Inc.Hedge fund	17K	$305,239
Zimmer Partners, LPHedge fund	15K	$268,350
Universal- Beteiligungs- Und Servicegesellschaft Mbh	14K	$253,770
Xtx Topco Ltd	14K	$250,281

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 114
Ten largest holders: 70.9%
Index fund managers: 13.9%
Active managers and hedge funds: 42.9%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	8	10	8	4	−1.5M	−9.5%
Index fund managers	8	1	0	0	+307K	+6.9%
Other institutions	62	13	43	2	+355K	+2.7%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Aktis Oncology.

Only managers that filed a holdings report for both quarters are compared (118 here). 4 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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