Senseonics Holdings, Inc.: which funds bought and sold

Institutions that bought and sold Senseonics Holdings 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, 71 institutions that filed 13F reports for both quarters added to or opened positions in Senseonics Holdings, and 32 cut or closed them. Together they added a net 12.1M shares, +138.0% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 3.0M shares (+82.6%); index fund managers were net buyers of 4.2M shares (+125.8%). 39 opened a new position and 17 sold out entirely.

Bought, Q2 2026 71 institutions, 39 of them new holders Sold, Q2 2026 32 institutions, 17 of them sold out

Net change, all compared +12.1M shares (+138.0%)

Net change, active managers +3.0M shares (+82.6%), 13 bought, 9 sold

Buyers versus sellers

institutions compared, 122

71 bought 19 32 sold

Active managers and hedge funds 13 bought · 9 sold · +3.0M

Index fund managers 9 bought · 0 sold · +4.2M

Other institutions 49 bought · 23 sold · +4.9M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Sessa Capital Im, L.P. Hedge fund	+2.7M +151.3%	4.4M	$25.2M
Blackrock, Inc. Index funds	+2.2M +391.2%	2.8M	$15.9M
Avidity Partners Management LP	+1.6M New position	1.6M	$9.1M
Sio Capital Management, LLC	+1.5M +1275.6%	1.6M	$9M
UBS Group AG	+1.0M +231.8%	1.5M	$8.4M
Geode Capital Management, LLC Index funds	+666K +142.7%	1.1M	$6.4M
Bank Of America Corp	+338K +592.5%	394K	$2.2M
State Street Corp Index funds	+331K +183.5%	511K	$2.9M
Walleye Capital LLC Hedge fund	+324K New position	324K	$1.8M
Vanguard Portfolio Management LLC Index funds	+272K New position	272K	$1.5M
Northern Trust Corp Index funds	+250K +303.8%	332K	$1.9M
Masters Capital Management LLC Hedge fund	+200K +40.0%	700K	$4M
Charles Schwab Investment Management Inc Index funds	+172K +77.8%	393K	$2.2M
Vanguard Capital Management LLC Index funds	+162K +10.0%	1.8M	$10.1M
Russell Investments Group, Ltd.	+153K +2188700.0%	153K	$870,265
Trexquant Investment LP Hedge fund	+135K New position	135K	$767,527
Ghisallo Capital Management LLC Hedge fund	+125K New position	125K	$710,000
Vanguard Fiduciary Trust Co Index funds	+106K +47.2%	331K	$1.9M
Readystate Asset Management LP	+101K New position	101K	$573,680
Penn Capital Management Company, LLC Active manager	+94K New position	94K	$534,715

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Sessa Capital Im, L.P. Hedge fund	+2.7M +151.3%	4.4M	$25.2M
Walleye Capital LLC Hedge fund	+324K New position	324K	$1.8M
Masters Capital Management LLC Hedge fund	+200K +40.0%	700K	$4M
Trexquant Investment LP Hedge fund	+135K New position	135K	$767,527
Ghisallo Capital Management LLC Hedge fund	+125K New position	125K	$710,000
Penn Capital Management Company, LLC Active manager	+94K New position	94K	$534,715
Price T Rowe Associates Inc Active manager	+32K +171.3%	51K	$292,000
Tocqueville Asset Management L.P. Active manager	+22K +65.7%	56K	$315,240
Centiva Capital, LP Hedge fund	+19K +78.3%	44K	$249,778
Bridgeway Capital Management, LLC Active manager	+19K +37.7%	68K	$387,944

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−481K −85.9%	79K	$449,958
Susquehanna International Group, LLP	−218K −94.4%	13K	$73,016
Hood River Capital Management LLC	−186K Sold out	0	—
Marshall Wace, LLP Hedge fund	−59K −12.6%	406K	$2.3M
Deutsche Bank Ag\	−45K −53.4%	39K	$222,996
Citadel Advisors LLC Hedge fund	−43K −56.2%	34K	$191,939
Jain Global LLC Hedge fund	−36K Sold out	0	—
Omers Administration Corp	−31K Sold out	0	—
Hudson Bay Capital Management LP Hedge fund	−23K Sold out	0	—
Schonfeld Strategic Advisors LLC Hedge fund	−20K Sold out	0	—
Catalyst Funds Management Pty Ltd	−15K Sold out	0	—
Susquehanna Portfolio Strategies, LLC	−14K Sold out	0	—
FMR LLC Active manager	−14K −92.6%	1,094	$6,216
Diametric Capital, LP	−13K Sold out	0	—
Two Sigma Securities, LLC	−10K Sold out	0	—
Kestra Advisory Services, LLC	−10K Sold out	0	—
Squarepoint Ops LLC Hedge fund	−9,478 −45.9%	11K	$63,366
Jefferies Financial Group Inc.	−9,129 −33.6%	18K	$102,257
Quantbot Technologies LP Hedge fund	−6,240 Sold out	0	—
Group One Trading LLC	−4,569 Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−481K −85.9%	79K	$449,958
Marshall Wace, LLP Hedge fund	−59K −12.6%	406K	$2.3M
Citadel Advisors LLC Hedge fund	−43K −56.2%	34K	$191,939
Jain Global LLC Hedge fund	−36K Sold out	0	—
Hudson Bay Capital Management LP Hedge fund	−23K Sold out	0	—
Schonfeld Strategic Advisors LLC Hedge fund	−20K Sold out	0	—
FMR LLC Active manager	−14K −92.6%	1,094	$6,216
Squarepoint Ops LLC Hedge fund	−9,478 −45.9%	11K	$63,366
Quantbot Technologies LP Hedge fund	−6,240 Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
Avidity Partners Management LP	1.6M	$9.1M
Walleye Capital LLCHedge fund	324K	$1.8M
Vanguard Portfolio Management LLCIndex funds	272K	$1.5M
Trexquant Investment LPHedge fund	135K	$767,527
Ghisallo Capital Management LLCHedge fund	125K	$710,000
Readystate Asset Management LP	101K	$573,680
Penn Capital Management Company, LLCActive manager	94K	$534,715
Bank Of New York Mellon Corp	84K	$479,864
Fox Run Management, L.L.C.	71K	$402,701
Nuveen, LLC	52K	$296,115

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Hood River Capital Management LLC	186K	$1.2M
Jain Global LLCHedge fund	36K	$239,267
Omers Administration Corp	31K	$206,460
Hudson Bay Capital Management LPHedge fund	23K	$156,350
Schonfeld Strategic Advisors LLCHedge fund	20K	$135,943
Catalyst Funds Management Pty Ltd	15K	$101,898
Susquehanna Portfolio Strategies, LLC	14K	$93,540
Diametric Capital, LP	13K	$89,323
Two Sigma Securities, LLC	10K	$68,065
Kestra Advisory Services, LLC	10K	$67,839

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 108
Ten largest holders: 78.8%
Index fund managers: 36.4%
Active managers and hedge funds: 31.8%

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	13	9	6	4	+3.0M	+82.6%
Index fund managers	9	0	2	0	+4.2M	+125.8%
Other institutions	49	23	31	13	+4.9M	+274.6%

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 Senseonics Holdings.

Only managers that filed a holdings report for both quarters are compared (122 here). 5 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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