Cyclerion Therapeutics CYCN Institutional Ownership

NASDAQ CYCN

$3.36 -0.85 (-20.19%)

At close: Sep 8, 2026 · 4:00 PM EDT

Institutions by Trading Activity

20 Institutions

Increased 11 55.0%

Unchanged 6 30.0%

Reduced 3 15.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

7.30%

▲+6.58 pp QoQ

Shares Held by Institutions

235.30K

of 3.23Mn outstanding

▲+985.54% QoQ

Shares Outstanding

3.23Mn

2.99Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+3 vs prior quarter

Net Shares Added (QoQ)

+213.62K

accumulated since last quarter

Value of Holdings

$1.00Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Cyclerion Therapeutics, Inc. (NASDAQ:CYCN) showed up in the 13F filings of 20 institutional investors as of June 2026.

These investors held 7.3% of outstanding shares in June 2026, up from 0.7% in March 2026.
Their total shares held in CYCN increased 985.54% from the prior quarter, while the number of investors in Cyclerion Therapeutics increased 25.0% year over year.
Among the 20 funds, 11 bought more Cyclerion Therapeutics shares, 3 sold down, and 6 held their ground.
In total, institutional investors held 235.3K shares in Cyclerion Therapeutics as of June 2026, up by 213.62K shares quarter on quarter, and up 205.71K shares year over year.
As of June 30, 2026, FMR LLC held the largest stake in Cyclerion Therapeutics with 92.79K shares, accounting for 2.88% of total shares outstanding.
The biggest buyers of Cyclerion Therapeutics for the quarter ending June 2026 included FMR LLC (92.12K), BALYASNY ASSET MANAGEMENT L.P. (45.36K), ADAR1 Capital Management, LLC (42.68K), BRAIDWELL LP (22.41K), CITADEL ADVISORS LLC (5.93K).
The largest sales of CYCN for the quarter ending June 2026 came from GEODE CAPITAL MANAGEMENT, LLC (5.53K), UBS Group AG (36), BNP PARIBAS FINANCIAL MARKETS (0).
Per Business Quant, the top 10 investors in CYCN for the quarter ending June 2026 include FMR LLC (92.79K), BALYASNY ASSET MANAGEMENT L.P. (45.36K), ADAR1 Capital Management, LLC (42.68K), BRAIDWELL LP (22.41K), CITADEL ADVISORS LLC (8.54K), GEODE CAPITAL MANAGEMENT, LLC (6.55K), VANGUARD CAPITAL MANAGEMENT LLC (4.42K), Rangeley Capital, LLC (3.47K), HRT FINANCIAL LP (3.15K), BlackRock, Inc. (2.4K).

Form 13F Holdings

20 Institutional Holders

Report period 30 Jun, 2026

Total shares held 235.30K

Of outstanding 7.30%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	FMR LLC	0000315066	92,792	2.88%	▲92,115	+13,603.52%	$2.20Mn
2	BALYASNY ASSET MANAGEMENT L.P.	0001218710	45,359	1.41%	▲45,359	0.00%	$1.08Mn
3	ADAR1 Capital Management, LLC	0001940272	42,680	1.32%	▲42,680	0.00%	$1.01Mn
4	BRAIDWELL LP	0001920938	22,413	0.69%	▲22,413	0.00%	$531.86K
5	CITADEL ADVISORS LLC	0001423053	8,542	0.26%	▲5,933	+227.45%	$202.71K
6	GEODE CAPITAL MANAGEMENT, LLC	0001214717	6,550	0.20%	▼5,529	-45.77%	$155.47K
7	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	4,416	0.14%	▲2,111	+91.58%	$104.80K
8	Rangeley Capital, LLC	0001517796	3,473	0.11%	▲3,473	0.00%	$82.41K
9	HRT FINANCIAL LP	0001475597	3,151	0.10%	▲3,151	0.00%	$74
10	BlackRock, Inc.	0002012383	2,400	0.07%	0	0.00%	$56.94K
11	DIMENSIONAL FUND ADVISORS LP	0000354204	1,675	0.05%	▲1,675	0.00%	$39.75K
12	VANGUARD FIDUCIARY TRUST CO	0000933478	1,050	0.03%	0	0.00%	$24.93K
13	UBS Group AG	0001610520	448	0.01%	▼37	-7.55%	$10.63K
14	Tower Research Capital LLC (TRC)	0001533421	264	0.01%	▲264	0.00%	$6.27K
15	GROUP ONE TRADING LLC	0000932540	27	0.00%	0	0.00%	$651
16	OSAIC HOLDINGS, INC.	0001677044	19	0.00%	0	0.00%	$440
17	Activest Wealth Management	0001883134	14	0.00%	0	0.00%	$339
18	Barclays Plc	0000312069	12	0.00%	▲12	0.00%	$295
19	WHI TRUST Co LLC	0002013902	10	0.00%	0	0.00%	$244
20	BNP PARIBAS FINANCIAL MARKETS	0001166588	1	0.00%	▼0	-20.00%	$14