Bluejay Diagnostics, Inc.: which funds bought and sold

Institutions that bought and sold Bluejay Diagnostics 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, 6 institutions that filed 13F reports for both quarters added to or opened positions in Bluejay Diagnostics, and 4 cut or closed them. Together they added a net 157K shares, +267.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 158K shares; index fund managers were net sellers of 18K shares (−63.6%). 5 opened a new position and 3 sold out entirely.

Bought, Q2 2026 6 institutions, 5 of them new holders Sold, Q2 2026 4 institutions, 3 of them sold out

Net change, all compared +157K shares (+267.4%)

Net change, active managers +158K shares (—), 2 bought, 0 sold

Buyers versus sellers

institutions compared, 11

6 bought 1 4 sold

Active managers and hedge funds 2 bought · 0 sold · +158K

Index fund managers 1 bought · 1 sold · −18K

Other institutions 3 bought · 3 sold · +17K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Armistice Capital, LLC Hedge fund	+131K New position	131K	$157,200
Heights Capital Management, Inc	+35K New position	35K	$42,480
Boothbay Fund Management, LLC Hedge fund	+27K New position	27K	$32,556
Bank Of America Corp	+10K New position	10K	$12,404
Vanguard Fiduciary Trust Co Index funds	+10K New position	10K	$12,270
Tower Research Capital LLC (TRC)	+178 +10.3%	1,907	$2,288

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Armistice Capital, LLC Hedge fund	+131K New position	131K	$157,200
Boothbay Fund Management, LLC Hedge fund	+27K New position	27K	$32,556

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Sabby Management, LLC	−29K Sold out	0	—
Geode Capital Management, LLC Index funds	−28K Sold out	0	—
UBS Group AG	−124 Sold out	0	—
Caitong International Asset Management Co., Ltd	−2 −66.7%	1	$1

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
Armistice Capital, LLCHedge fund	131K	$157,200
Heights Capital Management, Inc	35K	$42,480
Boothbay Fund Management, LLCHedge fund	27K	$32,556
Bank Of America Corp	10K	$12,404
Vanguard Fiduciary Trust CoIndex funds	10K	$12,270

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Sabby Management, LLC	29K	$52,856
Geode Capital Management, LLCIndex funds	28K	$51,753
UBS Group AG	124	$228

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 8
Ten largest holders: 100.0%
Index fund managers: 4.7%
Active managers and hedge funds: 73.2%

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	2	0	2	0	+158K	—
Index fund managers	1	1	1	1	−18K	−63.6%
Other institutions	3	3	2	2	+17K	+55.6%

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.

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