Cyclerion Therapeutics Ownership | Who Owns Cyclerion Therapeutics?

Cyclerion Therapeutics Ownership Summary

Cyclerion Therapeutics is owned by 77.59% institutional investors, 21.70% insiders, and 0.70% retail investors. Tyndall capital partners l p is the largest institutional shareholder, holding 5.05% of CYCN shares. Fidelity Growth Compy Commingled Pl S is the top mutual fund, with 6.15% of its assets in Cyclerion Therapeutics shares.

CYCN Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Cyclerion Therapeutics	77.59%	21.70%	0.70%
Sector	Healthcare Stocks	244.37%	12.11%	-156.48%
Industry	Biotech Stocks	379.01%	11.75%	-290.76%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Tyndall capital partners l p	155.19K	5.05%	$451.59M
Geode capital management	84.55K	2.62%	$129.80K
Vanguard group	23.49K	0.73%	$29.83K
Citadel advisors	18.26K	0.57%	$28.03K
Blackrock funding, inc. /de	16.80K	0.52%	$26.04K
Vanguard fiduciary trust	7.35K	0.23%	$11.29K
Fmr	4.74K	0.15%	$7.28K
Ubs group	3.39K	0.11%	$5.26K
Group one trading	192.00	0.01%	$295.00
Advisor group	130.00	0.00%	$201.00

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Tyndall capital partners l p	155.19K	100.00%	$451.59M
Drw securities	-	-	-
Zrc wealth management	-	-	-
Tower research capital llc (trc)	-	-	-
Geode capital management	84.55K	-	$129.80K
Barclays	-	-	-
Advisor group	130.00	-	$201.00
Two sigma investments, lp	-	-	-
Northwestern mutual wealth management	-	-	-
Activest wealth management	100.00	-	$155.00

Top Buyers

Holder	Shares	% Assets	Change
Geode capital management	84.55K	-	41.25K
Citadel advisors	18.26K	-	18.26K
Vanguard fiduciary trust	7.35K	-	7.35K
Ubs group	3.39K	-	3.02K
Activest wealth management	100.00	-	-

Top Sellers

Holder	Shares	% Assets	Change
Siren	-	-	-115.60K
Drw securities	-	-	-43.62K
Two sigma investments, lp	-	-	-41.55K
Xtx topco	-	-	-10.03K
Kovack advisors	-	-	-10.00K

New Positions

Holder	Shares	% Assets	Change	Value
Citadel advisors	18.26K	-	18.26K	$28.03K
Vanguard fiduciary trust	7.35K	-	7.35K	$11.29K

Sold Out

Holder	Change
Northwestern mutual wealth management	-1.00
Morgan stanley	-1.00
Caitong asset management	-4.00
Barclays	-5.00
Pandora wealth	-11.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	21	23.53%	3,298,422	1937.04%	77	523.28%	12	71.43%	3	200.00%
Mar 31, 2026	11	-42.11%	54,140	-81.73%	1	1.99%	5	-44.44%	1	-66.67%
Dec 31, 2025	12	-29.41%	208,242	-19.55%	6	9.09%	4	-20.00%	2	-33.33%
Sep 30, 2025	17	-	258,836	-28.66%	8	6.04%	5	25.00%	3	-25.00%
Jun 30, 2025	17	-5.56%	362,816	-2.83%	11	5.54%	4	33.33%	4	100.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Fidelity Growth Compy Commingled Pl S	287.76K	6.15%	-
Fidelity Growth Company Fund	217.99K	5.03%	-269.00
Fidelity Select Biotechnology	38.31K	1.52%	-3.55K
Fidelity Growth Company K6	60.68K	1.40%	269.00
Fidelity Series Growth Company	57.30K	1.32%	-
Fidelity Growth Compy Commingled Pl O	29.17K	1.16%	-
Vanguard Institutional Extnd Mkt Idx Tr	30.91K	0.66%	-
Fidelity Nasdaq Composite ETF	21.34K	0.46%	-
Fidelity Extended Market Index	17.46K	0.40%	-7.27K
LUX IM Global Medtech HX	16.43K	0.35%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 21, 2024	Slate Path Capital LP	-	Sell	$555.11K
Aug 09, 2023	MCGUIRE TERRANCE	-	Sell	$27.16
Jun 03, 2021	MCGUIRE TERRANCE	-	Buy	$289.63K
Jun 03, 2021	MCGUIRE TERRANCE	-	Buy	$10.36K
Jun 03, 2021	MCGUIRE TERRANCE	-	Buy	$10.36K

Insider Transactions Trends

Date	Buy	Sell
2025 Q1	-	-
2024 Q4	-	1
2024 Q3	-	-
2024 Q1	-	-
2023 Q4	-	-

CYCN Ownership FAQ

Who Owns Cyclerion Therapeutics?

Cyclerion Therapeutics shareholders are primarily institutional investors at 77.59%, followed by 21.70% insiders and 0.71% retail investors. The average institutional ownership in Cyclerion Therapeutics's industry, Biotech Stocks , is 379.01%, which Cyclerion Therapeutics falls below.

Who owns the most shares of Cyclerion Therapeutics?

Cyclerion Therapeutics’s largest shareholders are Tyndall capital partners l p (155.19K shares, 5.05%), Geode capital management (84.55K shares, 2.62%), and Vanguard group (23.49K shares, 0.73%). Together, they hold 8.40% of Cyclerion Therapeutics’s total shares outstanding.

Does Blackrock own Cyclerion Therapeutics?

BlackRock is not among the top 10 institutional shareholders of Cyclerion Therapeutics.

Who is Cyclerion Therapeutics’s biggest shareholder by percentage of total assets invested?

Tyndall capital partners l p is Cyclerion Therapeutics’s biggest shareholder by percentage of total assets invested, with 100.00% of its assets in 155.19K Cyclerion Therapeutics shares, valued at 451.59M$.

Who is the top mutual fund holder of Cyclerion Therapeutics shares?

Fidelity Growth Compy Commingled Pl S is the top mutual fund holder of Cyclerion Therapeutics shares, with 6.15% of its total shares outstanding invested in 287.76K Cyclerion Therapeutics shares.

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