고새머바이오(주)
US ˙ NasdaqGS ˙ US38341P1021

SecurityGOSS / Gossamer Bio, Inc.
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership329,052 shares
Latest Disclosed Value $ 404,733
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series ownership in GOSS / Gossamer Bio, Inc.

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 329,052 shares of Gossamer Bio, Inc. (US:GOSS) valued at $404,734 USD as of June 30, 2025. The entity filed a previous NPORT-P on August 25, 2023 disclosing 0 shares of Gossamer Bio, Inc.. The current value of the position is $57,584 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)
2025-08-26 2025-06-30 NP Gossamer Bio EC US38341P1021 329,052 329,052 405 0.0091
2023-08-25 2023-06-30 NP Gossamer Bio EC US38341P1021 0 -99,288 -100.00 0 -100.00
2023-05-26 2023-03-31 NP Gossamer Bio EC US38341P1021 99,288 0 0.00 125 -41.86 0.0033
2023-02-24 2022-12-31 NP Gossamer Bio EC US38341P1021 99,288 0 0.00 215 -81.92 0.0059
2022-11-25 2022-09-30 NP Gossamer Bio EC US38341P1021 99,288 4,147 4.36 1,189 49.37 0.0341
2022-08-25 2022-06-30 NP Gossamer Bio EC US38341P1021 95,141 -4,769 -4.77 796 -8.19 0.0220
2022-05-26 2022-03-31 NP Gossamer Bio EC US38341P1021 99,910 0 0.00 867 -23.21 0.0202
2022-02-25 2021-12-31 NP Gossamer Bio EC US38341P1021 99,910 12,558 14.38 1,130 2.82 0.0245
2021-11-24 2021-09-30 NP Gossamer Bio EC US38341P1021 87,352 0 0.00 1,098 54.87 0.0242
2021-08-26 2021-06-30 NP Gossamer Bio EC US38341P1021 87,352 0 0.00 709 -12.25 0.0152
2021-05-27 2021-03-31 NP Gossamer Bio EC US38341P1021 87,352 -4,511 -4.91 808 -9.01 0.0183
2021-02-25 2020-12-31 NP Gossamer Bio EC US38341P1021 91,863 0 0.00 888 -22.11 0.0228
2020-11-25 2020-09-30 NP Gossamer Bio EC US38341P1021 91,863 7,686 9.13 1,140 4.20 0.0366
2020-08-27 2020-06-30 NP Gossamer Bio EC US38341P1021 84,177 12,994 18.25 1,094 51.52 0.0358
2020-06-01 2020-03-31 NP Gossamer Bio EC US38341P1021 71,183 4,583 6.88 723 -30.58 0.0295
2020-02-27 2019-12-31 NP Gossamer Bio EC 38341P102 66,600 1,243 1.90 1,041 -5.20 0.0313
2019-11-27 2019-09-30 NP Gossamer Bio EC US38341P1021 65,357 65,357 1,097 0.0363
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.