Cyclerion Therapeutics Ownership | Who Owns Cyclerion Therapeutics?

Cyclerion Therapeutics Ownership Summary

Cyclerion Therapeutics is owned by 6.46% institutional investors, 26.76% insiders, and 66.78% retail investors. Tyndall capital partners l p is the largest institutional shareholder, holding 5.05% of CYCN shares. Fidelity Select Biotechnology is the top mutual fund, with 1.52% of its assets in Cyclerion Therapeutics shares.

CYCN Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Cyclerion Therapeutics	6.46%	26.76%	66.78%
Sector	Healthcare Stocks	232.01%	10.74%	-142.75%
Industry	Biotech Stocks	381.47%	10.55%	-292.02%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Tyndall capital partners l p	155.19K	5.05%	$451.59M
Siren	116.16K	3.78%	$267.16K
Geode capital management	43.30K	1.34%	$55.01K
Vanguard group	23.49K	0.73%	$29.83K
Blackrock funding, inc. /de	16.80K	0.52%	$21.33K
Two sigma investments, lp	13.29K	0.43%	$30.57K
Citigroup	8.20K	0.25%	$10.42K
Fmr	4.75K	0.15%	$10.92K
Tower research capital llc (trc)	2.33K	0.08%	$5.35K
Ubs group	376.00	0.01%	$478.00

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Tyndall capital partners l p	155.19K	100.00%	$451.59M
Siren	116.16K	0.01%	$267.16K
Tower research capital llc (trc)	2.33K	0.00%	$5.35K
Drw securities	-	-	-
Northwestern mutual wealth management	-	-	-
Barclays	-	-	-
Two sigma investments, lp	13.29K	-	$30.57K
Advisor group	130.00	-	$304.00
Zrc wealth management	-	-	-
Geode capital management	43.30K	-	$55.01K

Top Buyers

Holder	Shares	% Assets	Change
Two sigma investments, lp	13.29K	-	13.29K
Citigroup	8.20K	-	8.20K
Geode capital management	43.30K	-	6.14K
Ubs group	376.00	-	327.00
Fmr	4.75K	-	6.00

Top Sellers

Holder	Shares	% Assets	Change
Drw securities	-	-	-43.62K
Tyndall capital partners l p	155.19K	100.00%	-9.59K
Morgan stanley	1.00	-	-648.00
Tower research capital llc (trc)	2.33K	0.00%	-435.00
Zrc wealth management	-	-	-20.00

New Positions

Holder	Shares	% Assets	Change	Value
Two sigma investments, lp	13.29K	-	13.29K	$30.57K
Citigroup	8.20K	-	8.20K	$10.42K

Sold Out

Holder	Change
Northwestern mutual wealth management	-1.00
Barclays	-5.00
Pandora wealth	-11.00
Sbi securities	-11.00
Zrc wealth management	-20.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	18	-	373,392	-2.24%	14	6.49%	3	-57.14%	2	-33.33%
Dec 31, 2024	18	20.00%	381,943	-63.37%	15	0.88%	7	133.33%	3	-25.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Fidelity Select Biotechnology	38.31K	1.52%	-3.55K
Fidelity Growth Compy Commingled Pl O	29.17K	1.16%	-
Fidelity Growth Compy Commingled Pl S	29.68K	1.10%	298.00
Fidelity Growth Company Fund	20.56K	0.76%	-
Fidelity Nasdaq Composite ETF	20.83K	0.55%	-
LUX IM Global Medtech HX	16.43K	0.43%	16.29K
Vanguard Institutional Extnd Mkt Idx Tr	16.14K	0.42%	-
Fidelity Extended Market Index	15.22K	0.40%	2.67K
Fidelity Growth Company K6	9.22K	0.34%	-298.00
BlackRock Extended Equity Market K	3.00K	0.12%	-1.00

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 6.46%, followed by 26.76% insiders and 66.78% retail investors. The average institutional ownership in Cyclerion Therapeutics's industry, Biotech Stocks , is 381.47%, 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%), Siren (116.16K shares, 3.78%), and Geode capital management (43.3K shares, 1.34%). Together, they hold 10.18% 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 Select Biotechnology is the top mutual fund holder of Cyclerion Therapeutics shares, with 1.52% of its total shares outstanding invested in 38.32K Cyclerion Therapeutics shares.

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