Polaryx Therapeutics, Inc.: which funds bought and sold

Institutions that bought and sold Polaryx Therapeutics 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, 7 institutions that filed 13F reports for both quarters added to or opened positions in Polaryx Therapeutics, and 7 cut or closed them. Together they sold a net 74K shares, −3.3% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 140K shares (−100.0%); index fund managers were net buyers of 325 shares (+0.0%). 4 opened a new position and 5 sold out entirely.

Bought, Q2 2026 7 institutions, 4 of them new holders Sold, Q2 2026 7 institutions, 5 of them sold out

Net change, all compared −74K shares (−3.3%)

Net change, active managers −140K shares (−100.0%), 0 bought, 2 sold

Buyers versus sellers

institutions compared, 18

7 bought 4 7 sold

Active managers and hedge funds 0 bought · 2 sold · −140K

Index fund managers 2 bought · 1 sold · +325

Other institutions 5 bought · 4 sold · +66K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
HRT Financial LP	+82K New position	82K	$218,000
Jane Street Group, LLC	+31K New position	31K	$83,633
Allworth Financial LP	+7,727 New position	7,727	$20,554
Tower Research Capital LLC (TRC)	+1,221 +68.6%	3,002	$7,985
Vanguard Fiduciary Trust Co Index funds	+516 +0.5%	105K	$279,492
Geode Capital Management, LLC Index funds	+325 +0.2%	171K	$455,082
Fortitude Family Office, LLC	+189 New position	189	$503

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

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−128K Sold out	0	—
Bank Of America Corp	−26K Sold out	0	—
Goldman Sachs Group Inc	−13K Sold out	0	—
Squarepoint Ops LLC Hedge fund	−12K Sold out	0	—
UBS Group AG	−12K −90.5%	1,283	$3,413
Morgan Stanley	−5,543 Sold out	0	—
Vanguard Capital Management LLC Index funds	−516 0.0%	1.7M	$4.4M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−128K Sold out	0	—
Squarepoint Ops LLC Hedge fund	−12K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
HRT Financial LP	82K	$218,000
Jane Street Group, LLC	31K	$83,633
Allworth Financial LP	7,727	$20,554
Fortitude Family Office, LLC	189	$503

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Millennium Management LLCHedge fund	128K	$964,089
Bank Of America Corp	26K	$195,660
Goldman Sachs Group Inc	13K	$101,931
Squarepoint Ops LLCHedge fund	12K	$93,789
Morgan Stanley	5,543	$41,905

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 13
Ten largest holders: 99.8%
Index fund managers: 94.0%
Active managers and hedge funds: 0.0%

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	0	2	0	2	−140K	−100.0%
Index fund managers	2	1	0	0	+325	+0.0%
Other institutions	5	4	4	3	+66K	+98.6%

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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