Cyclerion Therapeutics Ownership | Who Owns Cyclerion Therapeutics?

Cyclerion Therapeutics Ownership Summary

Cyclerion Therapeutics is owned by 8.43% institutional investors, 31.48% insiders, and 60.09% 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	8.43%	31.48%	60.09%
Sector	Healthcare Stocks	42.54%	10.83%	46.63%
Industry	Biotech Stocks	45.22%	10.75%	44.04%

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
Drw securities	43.62K	1.42%	$100.32K
Geode capital management	37.16K	1.21%	$85.49K
Vanguard group	23.49K	0.76%	$54.03K
Blackrock funding, inc. /de	16.80K	0.55%	$38.63K
Two sigma investments, lp	13.29K	0.43%	$30.57K
Fmr	4.75K	0.15%	$10.92K
Tower research capital llc (trc)	2.33K	0.08%	$5.35K
Morgan stanley	649.00	0.02%	$1.49K

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
Drw securities	43.62K	0.00%	$100.32K
Tower research capital llc (trc)	2.33K	0.00%	$5.35K
Barclays	5.00	-	$12.00
Northwestern mutual wealth management	-	-	-
Two sigma investments, lp	13.29K	-	$30.57K
Advisor group	130.00	-	$304.00
Zrc wealth management	-	-	-
Geode capital management	37.16K	-	$85.49K

Top Buyers

Holder	Shares	% Assets	Change
Drw securities	43.62K	0.00%	43.62K
Two sigma investments, lp	13.29K	-	13.29K
Geode capital management	37.16K	-	4.42K
Fmr	4.75K	-	6.00
Barclays	5.00	-	5.00

Top Sellers

Holder	Shares	% Assets	Change
Ubs group	49.00	-	-9.68K
Tyndall capital partners l p	155.19K	100.00%	-9.59K
Tower research capital llc (trc)	2.33K	0.00%	-435.00
Zrc wealth management	-	-	-20.00
Pandora wealth	-	-	-11.00

New Positions

Holder	Shares	% Assets	Change	Value
Drw securities	43.62K	0.00%	43.62K	$100.32K
Two sigma investments, lp	13.29K	-	13.29K	$30.57K
Barclays	5.00	-	5.00	$12.00

Sold Out

Holder	Change
Northwestern mutual wealth management	-1.00
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 %
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%
Sep 30, 2024	15	-11.76%	1,042,639	-0.86%	41	2.35%	3	-57.14%	4	100.00%

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%	-
Vanguard Institutional Extnd Mkt Idx Tr	16.14K	0.52%	-7.35K
LUX IM Global Medtech HX	16.43K	0.51%	-
Fidelity Nasdaq Composite ETF	15.68K	0.49%	-
Fidelity Extended Market Index	12.63K	0.39%	1.45K
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 8.43%, followed by 31.48% insiders and 60.09% retail investors. The average institutional ownership in Cyclerion Therapeutics's industry, Biotech Stocks , is 45.22%, 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 Drw securities (43.62K shares, 1.42%). Together, they hold 10.26% 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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