Gossamer Bio, Inc. - Common Stock (GOSS) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2019 to Q4 2025

Type / Class
Equity / Common Stock
Symbol
GOSS on Nasdaq
Shares outstanding
227,306,614
Price per share
$3.10
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
180,099,073
Total reported value
$473,650,324
% of total 13F portfolios
0%
Share change
+2,781,366
Value change
+$14,481,602
Number of holders
161
Price from insider filings
$3.10
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Gossamer Bio, Inc. - Common Stock (GOSS) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Octagon Capital Advisors LP 8.6% $15,269,322 19,576,054 Octagon Capital Advisors LP 31 Dec 2024
BlackRock, Inc. 5.3% $13,348,873 12,135,339 BlackRock, Inc. 30 Jun 2025
VANGUARD GROUP INC 5% +15% $12,551,871 +$1,514,307 11,410,792 +14% The Vanguard Group 30 Jun 2025
Invus Global Management, LLC 2.8% $4,881,926 6,258,880 Invus Public Equities, L.P. 31 Dec 2024

As of 30 Sep 2025, 161 institutional investors reported holding 180,099,073 shares of Gossamer Bio, Inc. - Common Stock (GOSS). This represents 79% of the company’s total 227,306,614 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Gossamer Bio, Inc. - Common Stock (GOSS) together control 65% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
NEA Management Company, LLC 8% 18,093,034 0% 2.6% $47,584,679
Octagon Capital Advisors LP 7.5% 17,050,000 -7.1% 7% $44,841,500
BlackRock, Inc. 6.1% 13,846,054 +14% 0% $36,415,120
VANGUARD GROUP INC 5.3% 12,009,773 +5.2% 0% $31,585,704
ARCH Venture Management, LLC 3.5% 8,055,916 0% 4.3% $21,187,059
SAMSARA BIOCAPITAL, LLC 2.7% 6,130,268 0% 2.1% $16,122,605
Palo Alto Investors LP 2.4% 5,464,349 -4.8% 2.7% $14,371,238
Siren, L.L.C. 2.3% 5,208,968 0% 0.54% $13,699,586
683 Capital Management, LLC 2.2% 5,059,200 -20% 1.2% $13,305,696
ACADIAN ASSET MANAGEMENT LLC 2.2% 5,012,969 -30% 0.02% $13,181,000
HHLR ADVISORS, LTD. 2.2% 4,974,041 0% 0.32% $13,081,728
SILVERARC CAPITAL MANAGEMENT, LLC 2.1% 4,779,082 -7.1% 1.8% $12,568,986
GEODE CAPITAL MANAGEMENT, LLC 2.1% 4,689,531 +3% 0% $12,335,807
FMR LLC 1.8% 4,085,346 -44% 0% $10,744,459
STATE STREET CORP 1.7% 3,883,667 +57% 0% $10,214,044
PERCEPTIVE ADVISORS LLC 1.7% 3,812,797 0.29% $10,027,656
MILLENNIUM MANAGEMENT LLC 1.6% 3,619,329 +629% 0.01% $9,518,835
Rock Springs Capital Management LP 1.4% 3,266,960 0% 0.5% $8,592,105
RENAISSANCE TECHNOLOGIES LLC 1.3% 2,980,188 +9.1% 0.01% $7,837,894
BANK OF AMERICA CORP /DE/ 1.3% 2,881,904 +4196% 0% $7,579,408
UBS Group AG 1.2% 2,770,046 +786% 0% $7,285,221
Opaleye Management Inc. 1.2% 2,725,000 -23% 1% $7,166,750
TWO SIGMA INVESTMENTS, LP 1% 2,287,251 +31% 0.01% $6,015,470
CITADEL ADVISORS LLC 1% 2,284,216 +198% 0% $6,007,488
Alyeska Investment Group, L.P. 0.84% 1,909,087 -57% 0.02% $5,020,899

Institutional Holders of Gossamer Bio, Inc. - Common Stock (GOSS) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 771,189 $2,371,746 +$2,224,521 $3.10 8
2025 Q3 180,099,073 $473,650,324 +$14,481,602 $2.63 161
2025 Q2 177,241,576 $218,003,211 +$9,779,814 $1.23 123
2025 Q1 169,972,743 $186,887,807 -$1,268,189 $1.10 118
2024 Q4 171,287,734 $154,952,219 -$4,666,477 $0.90 102
2024 Q3 174,874,615 $172,644,460 -$19,949,500 $0.99 100
2024 Q2 182,850,284 $164,736,451 -$20,026,850 $0.90 93
2024 Q1 197,765,806 $233,516,476 -$9,737,699 $1.18 105
2023 Q4 203,269,695 $185,470,444 +$158,999 $0.91 95
2023 Q3 205,595,650 $171,214,688 +$117,846,819 $0.83 92
2023 Q2 62,000,206 $74,399,613 -$19,151,223 $1.20 90
2023 Q1 77,678,087 $97,873,726 -$40,250,283 $1.26 105
2022 Q4 103,747,173 $225,127,623 -$164,530,145 $2.17 114
2022 Q3 85,172,221 $1,020,321,964 +$262,098,037 $11.98 150
2022 Q2 61,370,826 $513,666,572 +$24,729,595 $8.37 119
2022 Q1 58,353,019 $506,516,748 +$4,617,599 $8.68 131
2021 Q4 55,807,335 $630,887,263 +$43,005,682 $11.31 126
2021 Q3 51,481,848 $646,683,496 +$25,328,223 $12.57 120
2021 Q2 53,088,406 $431,078,087 -$10,080,420 $8.12 113
2021 Q1 54,196,112 $501,300,947 +$10,017,506 $9.25 119
2020 Q4 50,717,775 $490,455,534 -$46,924,258 $9.67 116
2020 Q3 55,540,980 $689,258,591 +$37,201,933 $12.41 121
2020 Q2 52,072,577 $678,176,623 +$174,841,093 $13.00 105
2020 Q1 39,025,024 $396,106,329 -$15,723,567 $10.15 94
2019 Q4 40,257,502 $629,222,853 -$16,748,703 $15.63 82
2019 Q3 41,295,805 $692,998,039 +$153,723,925 $16.79 76
2019 Q2 36,668,236 $812,381,006 +$29,053,738 $22.18 72
2019 Q1 35,897,641 $776,340,000 +$776,340,321 $21.67 71