SCHEDULE 13D/A Filed 2026-07-01 Event 2026-06-29 SEC 0001104659-26-080004 →

D. E. SHAW & CO, L.P. → Gossamer Bio, Inc. GOSS

Stake: 8.30% Shares: 38,362,468 CUSIP: 38341P102 Class: Common Stock, $0.0001 par value per share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

6 13D/G filings on this issuer

5 other filings besides this one

Filer Track Record

14 filings by this filer

13 other filings in the data moat

Short Interest · settle 2026-07-31

DTC 1.49

94,986,016 shares short · +29.8% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $388K

Point72 Asset Mgmt

Post-Filing Returns · since 2026-06-29 on GOSS

+1 day

0.0%

+5 days

0.0%

+30 days

+16.3%

+60 days

—

+90 days

—

+180 days

—

Anchor price 0.18 on closest trading day on/after 2026-06-29. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Other 13D/G Filings on Gossamer Bio, Inc.

Filed	Form	Filer	Stake	Shares
2026-07-24	SCHEDULE 13D/A	D. E. SHAW & CO, L.P.	7.10%	32,642,631	view →
2026-06-11	SCHEDULE 13D	D. E. SHAW & CO, L.P.	9.50%	43,915,249	view →
2026-06-11	SCHEDULE 13G	DeepCurrents Investment Group LLC	—	—	view →
2026-06-11	SCHEDULE 13G	683 Capital Management, LLC	—	—	view →
2026-06-09	SCHEDULE 13G	Context Capital Management, LLC	—	—	view →

Other Filings by D. E. SHAW & CO, L.P.

Filed	Form	Issuer	Stake	Shares
2026-07-24	SCHEDULE 13D/A	Gossamer Bio, Inc.	7.10%	32,642,631	view →
2026-07-17	SCHEDULE 13G	CleanSpark, Inc.	—	—	view →
2026-07-09	SCHEDULE 13G	Alight, Inc. ALIT	—	—	view →
2026-07-02	SCHEDULE 13G	Inspire Medical Systems, Inc. INSP	—	—	view →
2026-07-02	SCHEDULE 13G	Agios Pharmaceuticals, Inc. AGIO	—	—	view →
2026-06-22	SCHEDULE 13G	Cracker Barrel Old Country Store, Inc. CBRL	—	—	view →
2026-06-11	SCHEDULE 13D	Gossamer Bio, Inc. GOSS	9.50%	43,915,249	view →
2026-06-03	SCHEDULE 13D/A	Enviri Corporation	—	0	view →
2026-06-03	SCHEDULE 13G	Enviri Corporation NVRI	—	—	view →
2024-10-09	SC	DIVERSIFIED HEALTHCARE TRUST DHCNL	—	—	view →
2023-10-05	SC	DIVERSIFIED HEALTHCARE TRUST DHCNL	—	—	view →
2023-07-18	SC	DIVERSIFIED HEALTHCARE TRUST DHCNL	—	—	view →
2021-11-10	SC	Decarbonization Plus Acquisition Corp III SLDPW	—	—	view →

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