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GOSS

Gossamer Bio, Inc.
$0.17 +0.01 (+2.98%) At close · Jul 2
Going-concern doubt — flagged May 15, 2026

Substantial doubt about the company's ability to continue as a going concern.

“The Company’s existing cash and cash equivalents are not sufficient to fund operating plans for at least one year from the issuance date of these financial statements. Accordingly, these conditions raise substantial doubt about the Company’s ability to continue as a going concern.”
View the 10-Q filed May 15, 2026
Market Cap
$40.65M
Shares
234,696,281

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 191
Total Value: $59,205,937
Total Shares: 179,957,606
Showing 1–100 of 199 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 191 13F filers · Δ vs Dec 31, 2025
Top Holder
9.8%
Jun 2023 → Mar 2026 · range 7.5% – 10.7%
+0.5 pts
Top 5
32.0%
Jun 2023 → Mar 2026 · range 25.4% – 37.8%
−4.9 pts
Top 10
50.3%
Jun 2023 → Mar 2026 · range 41.5% – 58.2%
−2.6 pts
HHI
371
Jun 2023 → Mar 2026 · range 315 – 462
Broadly held−25

Quarterly Activity

vs Dec 31, 2025
New
48
Increased
69
Decreased
55
Sold Out
57
Unchanged
19
Holder count: -9
Institutional value: -90.1%
Shares held: -6.8%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega AQR CAPITAL MANAGEMENT LLC +9,007,657 10,126,897
Large Balyasny Asset Management L.P. +4,405,607 5,922,298
Large Qube Research & Technologies Ltd +4,377,196 4,917,763
Mid GSA CAPITAL PARTNERS LLP +3,202,373 3,254,233
Large Squarepoint Ops LLC +3,177,166 3,398,757

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mid NEA Management Company, LLC −17,093,034 1,000,000
Mega STATE STREET CORP −4,922,860 4,388,109
Mega FMR LLC −4,215,074 22,516
Mega MILLENNIUM MANAGEMENT LLC −3,396,870 187,418
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP −1,747,682 1,588,873

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Small Kalehua Capital Management LLC 10,236,293 $3,367,740
Mega VANGUARD CAPITAL MANAGEMENT LLC 9,394,593 $3,090,821
Large Ensign Peak Advisors, Inc 1,702,125 $559,999
Mega VANGUARD FIDUCIARY TRUST CO 1,404,285 $462,009
Small Ishara Investments LP 820,000 $269,780

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 12,873,209 $39,906,947
Small Palo Alto Investors LP 4,471,592 $13,861,935
Mid PERCEPTIVE ADVISORS LLC 3,139,669 $9,732,973
Small Opaleye Management Inc. 2,720,000 $8,432,000
Large TWO SIGMA ADVISERS, LP 2,596,900 $8,050,390
Filter: New 48 Increased 69 Reduced 55 Sold out 57 Unchanged 19
Showing 100 of 199
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $5,535,978 9.35% 16,826,695
Small Kalehua Capital Management LLC $3,367,740 5.69% 10,236,293
Mega AQR CAPITAL MANAGEMENT LLC $3,331,745 5.63% 10,126,897
Mega VANGUARD CAPITAL MANAGEMENT LLC $3,090,821 5.22% 9,394,593
Small Octagon Capital Advisors LP $2,953,121 4.99% 8,976,054
Small ARCH Venture Management, LLC $2,650,396 4.48% 8,055,916
Small Octagon Capital Advisors LP $2,549,750 4.31% 7,750,000
Mid SAMSARA BIOCAPITAL, LLC $2,376,221 4.01% 7,222,559
Large Balyasny Asset Management L.P. $1,948,436 3.29% 5,922,298
Large ACADIAN ASSET MANAGEMENT LLC $1,736,430 2.93% 5,277,904
Mid Siren, L.L.C. $1,713,750 2.89% 5,208,968
Mid 683 Capital Management, LLC $1,645,000 2.78% 5,000,000
Mid HHLR ADVISORS, LTD. $1,636,459 2.76% 4,974,041
Mega GEODE CAPITAL MANAGEMENT, LLC $1,625,157 2.74% 4,939,691
Large Qube Research & Technologies Ltd $1,617,944 2.73% 4,917,763
Mega TWO SIGMA INVESTMENTS, LP $1,572,899 2.66% 4,780,851
Mega STATE STREET CORP $1,443,687 2.44% 4,388,109
Large Corient Private Wealth LLC $1,311,191 2.21% 3,985,383
Large Squarepoint Ops LLC $1,118,191 1.89% 3,398,757
Mid GSA CAPITAL PARTNERS LLP $1,070,642 1.81% 3,254,233
Mega BANK OF AMERICA CORP /DE/ Bank $1,044,155 1.76% 3,173,725
Mega BARCLAYS PLC $1,008,649 1.70% 3,065,806
Large Alyeska Investment Group, L.P. $674,924 1.14% 2,051,442
Mega UBS Group AG $619,698 1.05% 1,883,583
Large Ensign Peak Advisors, Inc $559,999 0.95% 1,702,125
Large JACOBS LEVY EQUITY MANAGEMENT, INC $557,707 0.94% 1,695,159
Mid Rock Springs Capital Management LP $529,522 0.89% 1,609,492
Large MACKENZIE FINANCIAL CORP $505,647 0.85% 1,536,923
Micro MB Generational Wealth, LLC $504,074 0.85% 1,532,142
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $496,815 0.84% 1,510,076
Mega NORTHERN TRUST CORP Bank $463,546 0.78% 1,408,960
Mega VANGUARD FIDUCIARY TRUST CO Bank $462,009 0.78% 1,404,285
Mega DEUTSCHE BANK AG\ Bank $429,635 0.73% 1,305,886
Large RENAISSANCE TECHNOLOGIES LLC $400,678 0.68% 1,217,868
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $400,064 0.68% 1,216,000
Mega GOLDMAN SACHS GROUP INC $388,398 0.66% 1,180,544
Mid NEA Management Company, LLC $329,000 0.56% 1,000,000
Large VOYA INVESTMENT MANAGEMENT LLC $285,116 0.48% 866,615
Mid Hennion & Walsh Asset Management, Inc. $272,648 0.46% 828,719
Small Ishara Investments LP $269,780 0.46% 820,000
Mid XTX Topco Ltd $223,432 0.38% 679,125
Large Connor, Clark & Lunn Investment Management Ltd. $216,554 0.37% 658,221
Small Murchinson Ltd. $174,370 0.29% 530,000
Small SILVERBACK ASSET MANAGEMENT LLC $164,500 0.28% 500,000
Small SMITH, MOORE & CO. $154,630 0.26% 470,000
Large PANAGORA ASSET MANAGEMENT INC $154,612 0.26% 469,946
Mega Invesco Ltd. $152,972 0.26% 464,968
Mega Bank of New York Mellon Corp Bank $140,890 0.24% 428,241
Large Mariner, LLC $137,654 0.23% 418,404
Large IEQ CAPITAL, LLC $129,540 0.22% 393,739
Mega D. E. Shaw & Co., Inc. $128,122 0.22% 389,431
Mega LPL Financial LLC $122,300 0.21% 371,734
Mega MORGAN STANLEY $120,864 0.20% 367,378
Large CWM, LLC $105,278 0.18% 319,995
Mid ADAR1 Capital Management, LLC $94,597 0.16% 287,531
Mid Virtu Financial LLC $86,596 0.15% 263,212
Mid CHOREO, LLC $82,286 0.14% 250,111
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $78,005 0.13% 237,100
Mega CITADEL ADVISORS LLC $72,412 0.12% 220,100
Mega RHUMBLINE ADVISERS $71,194 0.12% 216,396
Mega ALLIANCEBERNSTEIN L.P. $62,582 0.11% 190,220
Large MERCER GLOBAL ADVISORS INC /ADV $62,288 0.11% 189,328
Mega MILLENNIUM MANAGEMENT LLC $61,660 0.10% 187,418
Mega CITADEL ADVISORS LLC $56,324 0.10% 171,200
Mega JANE STREET GROUP, LLC $51,158 0.09% 155,500
Mid Merit Financial Group, LLC $50,811 0.09% 154,441
Mid BOOTHBAY FUND MANAGEMENT, LLC $47,968 0.08% 145,800
Large Russell Investments Group, Ltd. $47,791 0.08% 145,272
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $44,669 0.08% 135,773
Mega Nuveen, LLC $43,722 0.07% 132,894
Mega PRICE T ROWE ASSOCIATES INC /MD/ $43,436 0.07% 132,026
Large LOS ANGELES CAPITAL MANAGEMENT LLC $43,170 0.07% 131,216
Large SG Americas Securities, LLC Broker-Dealer $42,298 0.07% 128,568
Large Creative Planning $41,331 0.07% 125,627
Large TUDOR INVESTMENT CORP ET AL $37,912 0.06% 115,237
Mid NINE MASTS CAPITAL Ltd $37,758 0.06% 114,766
Mega HSBC HOLDINGS PLC $37,487 0.06% 113,943
Large COMMONWEALTH EQUITY SERVICES, LLC $36,182 0.06% 109,978
Large Rockefeller Capital Management L.P. $35,404 0.06% 107,615
Mega VICTORY CAPITAL MANAGEMENT INC $35,249 0.06% 107,141
Large Cerity Partners LLC $35,043 0.06% 106,519
Mid BCV Asset Management Inc. $35,038 0.06% 106,500
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $34,032 0.06% 103,443
Small Quarry LP $32,900 0.06% 100,000
Mega BNP PARIBAS ARBITRAGE, SA $31,454 0.05% 95,606
Mega JPMORGAN CHASE & CO $30,493 0.05% 92,690
Small Sivia Capital Partners, LLC $30,162 0.05% 91,679
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $30,076 0.05% 91,418
Mid Sequoia Financial Advisors, LLC $29,797 0.05% 90,570
Mid GROUP ONE TRADING LLC $27,502 0.05% 83,595
Mega Vanguard Global Advisers, LLC $26,215 0.04% 79,682
Mega WELLS FARGO & COMPANY/MN $25,089 0.04% 76,264
Small Virtus Investment Advisers, LLC $24,920 0.04% 75,746
Large NOMURA HOLDINGS INC $24,642 0.04% 74,900
Large Focus Partners Wealth $24,021 0.04% 73,013
Large Caption Management, LLC $23,451 0.04% 71,282
Mid Caprock Group, LLC $23,030 0.04% 70,000
Small Velan Capital Investment Management LP $23,030 0.04% 70,000
Small WADDELL & ASSOCIATES, LLC $22,224 0.04% 67,552
Large HighTower Advisors, LLC $21,592 0.04% 65,630
Key facts CIK 1728117 CUSIP 38341P102 13F (30d) 6 filings 5 filers

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