Gossamer Bio, Inc.
DE ˙ DB ˙ US38341P1021
0,15 € ↓ -0,02 (-9,23%)
2026-06-04
DEL PRIS
SecurityDE:4GB / Gossamer Bio, Inc.
InstitutionBirchview Capital, LP
Latest Disclosed Ownership18,176 shares
Latest Disclosed Value $ 5,971
Birchview Capital, LP reports 86.85% decrease in ownership of 4GB / Gossamer Bio, Inc.

On May 15, 2026 - Birchview Capital, LP filed a 13F-HR form disclosing ownership of 18,176 shares of Gossamer Bio, Inc. (DE:4GB) valued at $4,995 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 138,176 shares of Gossamer Bio, Inc.. This represents a change in shares of -86.85% during the quarter. The current value of the position is $2,772 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F GOSSAMER BIO COM 38341P102 18,176 -120,000 -86.85 6 -98.83 0.0034
2026-02-13 2025-12-31 13F GOSSAMER BIO COM 38341P102 138,176 0 0.00 428 17.91 0.2508
2025-11-13 2025-09-30 13F GOSSAMER BIO COM 38341P102 138,176 0 0.00 363 114.79 0.2744
2025-08-14 2025-06-30 13F GOSSAMER BIO COM 38341P102 138,176 0 0.00 170 11.92 0.1688
2025-05-15 2025-03-31 13F GOSSAMER BIO COM 38341P102 138,176 0 0.00 152 21.77 0.1320
2025-06-30 2024-12-31 13F/A-1 GOSSAMER BIO COM 38341P102 138,176 0 0.00 125 -8.82 0.1017
2025-02-14 2024-12-31 13F GOSSAMER BIO COM 38341P102 138,176 0 125 0.1019
2025-06-30 2024-09-30 13F/A-1 GOSSAMER BIO COM 38341P102 138,176 0 0.00 136 9.68 0.1180
2024-11-14 2024-09-30 13F GOSSAMER BIO COM 38341P102 138,176 0 136 0.1183
2025-06-30 2024-06-30 13F/A-1 GOSSAMER BIO COM 38341P102 138,176 0 0.00 124 -23.93 0.1151
2024-08-13 2024-06-30 13F GOSSAMER BIO COM 38341P102 138,176 0 124 0.1153
2025-06-30 2024-03-31 13F/A-1 GOSSAMER BIO COM 38341P102 138,176 0 0.00 163 29.37 0.1329
2024-05-14 2024-03-31 13F GOSSAMER BIO COM 38341P102 138,176 0 163 0.1331
2025-06-30 2023-12-31 13F/A-1 GOSSAMER BIO COM 38341P102 138,176 -70,912 -33.91 126 -27.59 0.0987
2024-02-14 2023-12-31 13F GOSSAMER BIO COM 38341P102 138,176 -70,912 126 0.0989
2025-06-30 2023-09-30 13F/A-1 GOSSAMER BIO COM 38341P102 209,088 110,000 111.01 174 47.46 0.1479
2023-11-14 2023-09-30 13F GOSSAMER BIO COM 38341P102 209,088 110,000 174 0.1482
2023-08-08 2023-06-30 13F GOSSAMER BIO COM 38341P102 99,088 0 0.00 119 0.0891
2023-05-12 2023-03-31 13F GOSSAMER BIO COM 38341P102 99,088 0 0.00 0 0.0979
2023-02-03 2022-12-31 13F GOSSAMER BIO COM 38341P102 99,088 -60,000 -37.71 0 -100.00 0.1519
2022-11-28 2022-09-30 13F/A-1 GOSSAMER BIO COM 38341P102 159,088 0 0.00 1,906 43.09 1.3421
2022-11-07 2022-09-30 13F GOSSAMER BIO COM 38341P102 159,088 0 1,906 1.3489
2022-08-12 2022-06-30 13F GOSSAMER BIO COM 38341P102 159,088 30,000 23.24 1,332 18.93 0.9689
2022-05-13 2022-03-31 13F GOSSAMER BIO COM 38341P102 129,088 29,088 29.09 1,120 -0.97 0.8063
2022-02-14 2021-12-31 13F GOSSAMER BIO COM 38341P102 100,000 60,000 150.00 1,131 124.85 0.7293
2021-11-12 2021-09-30 13F GOSSAMER BIO COM 38341P102 40,000 40,000 503 0.3423
2020-05-12 2020-03-31 13F GOSSAMER BIO COM 38341P102 0 -30,000 -100.00 0 -100.00
2020-02-12 2019-12-31 13F GOSSAMER BIO COM 38341P102 30,000 30,000 469 0.3409
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.