Gossamer Bio GOSS Institutional Ownership

NASDAQ GOSS

$11.85 +0.27 (+2.33%)

At close: Sep 30, 2026 · 4:00 PM EDT

Institutions by Trading Activity

168 Institutions

Increased 88 52.4%

Unchanged 36 21.4%

Reduced 44 26.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

116.06%

▲+44.73 pp QoQ

Shares Held by Institutions

4.64Mn

of 4.00Mn outstanding

▲+132.51% QoQ

Shares Outstanding

4.00Mn

-642.41K held outside 13F filers

Institutional Investors

168

filed 13F for Jun 2026

▼-16 vs prior quarter

Net Shares Added (QoQ)

+2.65Mn

accumulated since last quarter

Value of Holdings

$55.01Mn

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

Gossamer Bio, Inc. (NASDAQ:GOSS) has 168 institutional investors with active 13F positions as of June 2026.

Collectively, these holders controlled 116.1% of Gossamer Bio's outstanding shares in June 2026, up from 71.3% in March 2026.
Their total shares held in GOSS increased 132.51% from the prior quarter, while the number of investors in Gossamer Bio increased 36.59% year over year.
Of these 168 funds, 88 grew their exposure to Gossamer Bio, 44 cut back, and 36 maintained positions.
The aggregate institutional position in Gossamer Bio amounted to 4.64Mn shares as of June 2026, up by 2.65Mn shares quarter on quarter, and up 2.45Mn shares year over year.
D. E. Shaw & Co., Inc. leads ownership in GOSS with 511.99K shares as of June 30, 2026, equal to 12.8% of outstanding shares.
Leading buyers of Gossamer Bio shares for the quarter ending June 2026 were D. E. Shaw & Co., Inc. (507.12K), DeepCurrents Investment Group LLC (470.81K), 683 Capital Management, LLC (427.49K), Context Capital Management, LLC (361.83K), Worth Venture Partners, LLC (312.72K).
The largest sales of GOSS for the quarter ending June 2026 came from BlackRock, Inc. (114.46K), BALYASNY ASSET MANAGEMENT L.P. (72.73K), ACADIAN ASSET MANAGEMENT LLC (43.57K), State Street Corp (40.92K), Bank Of America Corp /De/ (34.71K).
Business Quant data shows the 10 biggest positions in Gossamer Bio as of June 2026 are held by D. E. Shaw & Co., Inc. (511.99K), 683 Capital Management, LLC (489.99K), DeepCurrents Investment Group LLC (470.81K), Context Capital Management, LLC (361.83K), Worth Venture Partners, LLC (312.72K), AQR CAPITAL MANAGEMENT LLC (195.37K), GSA CAPITAL PARTNERS LLP (187.34K), WOLVERINE ASSET MANAGEMENT LLC (161.18K), RENAISSANCE TECHNOLOGIES LLC (145.37K), Kalehua Capital Management LLC (139.37K).

Form 13F Holdings

168 Institutional Holders

Report period 30 Jun, 2026

Total shares held 4.64Mn

Of outstanding 116.06%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	D. E. Shaw & Co., Inc.	0001009207	511,991	12.80%	▲507,123	+10,417.73%	$6.74Mn
2	683 Capital Management, LLC	0001404574	489,986	12.25%	▲427,486	+683.98%	$6.45Mn
3	DeepCurrents Investment Group LLC	0001754535	470,813	11.77%	▲470,813	0.00%	$6.03Mn
4	Context Capital Management, LLC	0001301396	361,831	9.05%	▲361,831	0.00%	$4.76Mn
5	Worth Venture Partners, LLC	0001696778	312,724	7.82%	▲312,724	0.00%	$4.12Mn
6	AQR CAPITAL MANAGEMENT LLC	0001167557	195,375	4.88%	▲68,789	+54.34%	$2.57Mn
7	GSA CAPITAL PARTNERS LLP	0001362033	187,337	4.68%	▲146,659	+360.54%	$2.47K
8	WOLVERINE ASSET MANAGEMENT LLC	0001279891	161,184	4.03%	▲161,184	0.00%	$2.12Mn
9	RENAISSANCE TECHNOLOGIES LLC	0001037389	145,374	3.63%	▲130,150	+854.94%	$1.91Mn
10	Kalehua Capital Management LLC	0002106181	139,367	3.48%	▲45,969	+49.22%	$1.84Mn
11	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	117,700	2.94%	▲268	+0.23%	$1.55Mn
12	ARCH Venture Management, LLC	0001274403	100,699	2.52%	0	0.00%	$1.33Mn
13	Barclays Plc	0000312069	97,907	2.45%	▲59,584	+155.48%	$1.29Mn
14	Octagon Capital Advisors LP	0001839435	96,875	2.42%	0	0.00%	$1.28Mn
15	BlackRock, Inc.	0002012383	95,874	2.40%	▼114,459	-54.42%	$1.26Mn
16	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	0001164508	94,667	2.37%	▲94,667	0.00%	$1.25Mn
17	TWO SIGMA INVESTMENTS, LP	0001179392	92,900	2.32%	▲33,139	+55.45%	$1.22Mn
18	Samsara BioCapital, LLC	0001744967	90,282	2.26%	0	0.00%	$1.19Mn
19	Qube Research & Technologies Ltd	0001729829	88,322	2.21%	▲26,850	+43.68%	$1.16Mn
20	Corient Private Wealth LP	0001948780	70,319	1.76%	▲20,502	+41.15%	$925.96K

Showing 1 to 20 of 168 holders