Gossamer Bio, Inc.
DE ˙ DB ˙ US38341P1021
0,15 € ↓ -0,02 (-9,23%)
2026-06-04
DEL PRIS
SecurityDE:4GB / Gossamer Bio, Inc.
InstitutionXTX Topco Ltd
Latest Disclosed Ownership679,125 shares
Latest Disclosed Value $ 223,093
XTX Topco Ltd reports 48.82% increase in ownership of 4GB / Gossamer Bio, Inc.

On May 15, 2026 - XTX Topco Ltd filed a 13F-HR form disclosing ownership of 679,125 shares of Gossamer Bio, Inc. (DE:4GB) valued at $186,624 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 456,329 shares of Gossamer Bio, Inc.. This represents a change in shares of 48.82% during the quarter. The current value of the position is $103,567 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 679,125 222,796 48.82 223 -84.23 0.0039
2026-02-17 2025-12-31 13F GOSSAMER BIO COM 38341P102 456,329 181,547 66.07 1,415 95.84 0.0371
2025-11-14 2025-09-30 13F GOSSAMER BIO COM 38341P102 274,782 175,806 177.62 723 496.69 0.0375
2025-08-12 2025-06-30 13F GOSSAMER BIO COM 38341P102 98,976 98,976 122 0.0050
2025-05-08 2025-03-31 13F GOSSAMER BIO COM 38341P102 0 -21,339 -100.00 0 -100.00
2025-02-13 2024-12-31 13F GOSSAMER BIO COM 38341P102 21,339 21,339 19 0.0016
2024-05-13 2024-03-31 13F GOSSAMER BIO COM 38341P102 0 -53,458 -100.00 0 -100.00
2024-02-13 2023-12-31 13F GOSSAMER BIO COM 38341P102 53,458 53,458 49 0.0107
2023-11-13 2023-09-30 13F GOSSAMER BIO COM 38341P102 0 -41,837 -100.00 0 -100.00
2023-08-14 2023-06-30 13F GOSSAMER BIO COM 38341P102 41,837 -391,356 -90.34 50 -90.83 0.0090
2023-05-12 2023-03-31 13F GOSSAMER BIO COM 38341P102 433,193 166,059 62.16 546 -5.87 0.1144
2023-02-14 2022-12-31 13F GOSSAMER BIO COM 38341P102 267,134 250,669 1,522.44 580 193.91 0.1230
2022-11-14 2022-09-30 13F GOSSAMER BIO COM 38341P102 16,465 16,465 197 0.0488
2022-05-13 2022-03-31 13F GOSSAMER BIO COM 38341P102 0 -13,310 -100.00 0 -100.00
2022-02-11 2021-12-31 13F GOSSAMER BIO COM 38341P102 13,310 13,310 151 0.0854
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.