Leonabio, Inc.: which funds bought and sold

Institutions that bought and sold Leonabio 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, 14 institutions that filed 13F reports for both quarters added to or opened positions in Leonabio, and 10 cut or closed them. Together they added a net 493K shares, +7.2% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 374K shares (+11.8%); index fund managers were net buyers of 106K shares (+26.5%). 6 opened a new position and 3 sold out entirely.

Bought, Q2 2026 14 institutions, 6 of them new holders Sold, Q2 2026 10 institutions, 3 of them sold out

Net change, all compared +493K shares (+7.2%)

Net change, active managers +374K shares (+11.8%), 5 bought, 0 sold

Buyers versus sellers

institutions compared, 45

14 bought 21 10 sold

Active managers and hedge funds 5 bought · 0 sold · +374K

Index fund managers 4 bought · 0 sold · +106K

Other institutions 5 bought · 10 sold · +13K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Adage Capital Partners Gp, L.L.C. Hedge fund	+300K New position	300K	$2.8M
Vanguard Capital Management LLC Index funds	+80K +41.3%	275K	$2.5M
ADAR1 Capital Management, LLC Hedge fund	+50K +6.8%	777K	$7.1M
Blackrock, Inc. Index funds	+23K +41.3%	79K	$727,719
Dimensional Fund Advisors LP	+15K New position	15K	$135,351
Renaissance Technologies LLC Hedge fund	+13K +20.6%	77K	$711,527
Xtx Topco Ltd	+12K New position	12K	$107,973
Citadel Advisors LLC Hedge fund	+10K New position	10K	$91,909
Vanguard Fiduciary Trust Co Index funds	+2,775 +6.9%	43K	$393,461
Jpmorgan Chase & Co	+2,000 +16666.7%	2,012	$17,826
Millennium Management LLC Hedge fund	+772 +2.4%	32K	$298,216
Tower Research Capital LLC (TRC)	+438 New position	438	$4,025
Geode Capital Management, LLC Index funds	+95 +0.1%	80K	$739,513
Barclays PLC	+42 New position	42	$386

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Adage Capital Partners Gp, L.L.C. Hedge fund	+300K New position	300K	$2.8M
ADAR1 Capital Management, LLC Hedge fund	+50K +6.8%	777K	$7.1M
Renaissance Technologies LLC Hedge fund	+13K +20.6%	77K	$711,527
Citadel Advisors LLC Hedge fund	+10K New position	10K	$91,909
Millennium Management LLC Hedge fund	+772 +2.4%	32K	$298,216

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Seven Fleet Capital Management LP	−11K −6.4%	154K	$1.4M
Osaic Holdings, Inc.	−1,600 −25.9%	4,580	$42,090
Royal Bank Of Canada	−1,381 −62.1%	844	$8,000
UBS Group AG	−1,103 −84.9%	196	$1,802
Annis Gardner Whiting Capital Advisors, LLC	−1,000 Sold out	0	—
Newedge Advisors, LLC	−410 Sold out	0	—
Morgan Stanley	−382 −81.1%	89	$818
Bank Of America Corp	−9 0.0%	33K	$299,199
BNP Paribas Financial Markets	−3 −13.0%	20	$184
Citigroup Inc	−1 Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
None of the active managers on our list.

New positions

largest by value

Institution	Shares	Value June 30, 2026
Adage Capital Partners Gp, L.L.C.Hedge fund	300K	$2.8M
Dimensional Fund Advisors LP	15K	$135,351
Xtx Topco Ltd	12K	$107,973
Citadel Advisors LLCHedge fund	10K	$91,909
Tower Research Capital LLC (TRC)	438	$4,025
Barclays PLC	42	$386

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Annis Gardner Whiting Capital Advisors, LLC	1,000	$10,280
Newedge Advisors, LLC	410	$4,214
Citigroup Inc	1	$10

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 44
Ten largest holders: 84.4%
Index fund managers: 6.6%
Active managers and hedge funds: 46.2%

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	5	0	2	0	+374K	+11.8%
Index fund managers	4	0	0	0	+106K	+26.5%
Other institutions	5	10	4	3	+13K	+0.4%

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 Leonabio.

Only managers that filed a holdings report for both quarters are compared (45 here). 3 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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