NASDAQ:GOSS

Gossamer Bio Stock Insider Trading

Healthcare > Biotechnology

Buy GOSS

*Your capital is at risk

$0.171

+0.0072 (+4.38%)

At Close: Jun 23, 2026

Gossamer Bio Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be negative at -71.91. In total, the insiders bought 19.05M and sold 16.59M GOSS shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	-71.91
● Buy	19.05M shares
● Sell	16.59M shares
60% Buy Activity Moderate Positive Correlation
Sell Signal High Confidence Mar 19, 2026 Analysis Breakdown: Strongly supported by a very low Insider Power Score of -71.91. Partially supported by a positive historical correlation. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Jun 04, 2026 Buy	Stock Option (Right to Buy) A-Award	Quisel John D Director	Director	115 000 Value: $20.5K
Jun 04, 2026 Buy	Stock Option (Right to Buy) A-Award	Drynan Skye Director	Director	115 000 Value: $20.5K
Jun 04, 2026 Buy	Stock Option (Right to Buy) A-Award	Daniel Thomas O Director	Director	115 000 Value: $20.5K
Jun 04, 2026 Buy	Stock Option (Right to Buy) A-Award	Nathan Steven D Director	Director	115 000 Value: $20.5K
Jun 04, 2026 Buy	Stock Option (Right to Buy) A-Award	Milligan Sandra Director	Director	115 000 Value: $20.5K
Jun 04, 2026 Buy	Stock Option (Right to Buy) A-Award	Cox Russell J. Director	Director	115 000 Value: $20.5K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Christian Waage EVP, Tech Ops And Admin	Officer	125 000 Value: $104.8K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Christian Waage EVP, Tech Ops And Admin	Officer	375 000 Value: $363.8K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Christian Waage EVP, Tech Ops And Admin	Officer	440 000 Value: $497.2K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Christian Waage EVP, Tech Ops And Admin	Officer	506 250 Value: $1.46M
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Christian Waage EVP, Tech Ops And Admin	Officer	47 667 Value: $21.5K
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Christian Waage EVP, Tech Ops And Admin	Officer	60 000 Value: $27.0K
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Christian Waage EVP, Tech Ops And Admin	Officer	506 250 Value: $227.8K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Giraudo Bryan COO/cfo	C-Suite Officer	693 750 Value: $2.00M
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Giraudo Bryan COO/cfo	C-Suite Officer	96 667 Value: $131.5K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Giraudo Bryan COO/cfo	C-Suite Officer	638 000 Value: $720.9K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Giraudo Bryan COO/cfo	C-Suite Officer	543 750 Value: $527.4K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Giraudo Bryan COO/cfo	C-Suite Officer	181 250 Value: $151.9K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Giraudo Bryan COO/cfo	C-Suite Officer	211 500 Value: $255.9K
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Giraudo Bryan COO/cfo	C-Suite Officer	211 500 Value: $95.2K
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Giraudo Bryan COO/cfo	C-Suite Officer	543 750 Value: $244.7K
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Giraudo Bryan COO/cfo	C-Suite Officer	638 000 Value: $287.1K
Mar 19, 2026 Buy	Stock Option (Right to Buy) A-Award	Giraudo Bryan COO/cfo	C-Suite Officer	693 750 Value: $312.2K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Hasnain Faheem President & CEO	CEO / President	47 000 Value: $568.7K
Mar 19, 2026 Sell	Stock Option (Right to Buy) D-Return	Hasnain Faheem President & CEO	CEO / President	437 500 Value: $366.6K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT GOSSAMER BIO INC.

Gossamer Bio, Inc., a clinical-stage biopharmaceutical company, focuses on discovering, acquiring, developing, and commercializing therapeutics in the disease areas of immunology, inflammation, and oncology in the United States. The company is developing GB002, an inhaled, small molecule, platelet-derived growth factor receptor, or PDGFR, colonystimulating factor 1 receptor, or CSF1R, and c-KIT inhibitor for the treatment of pulmonary arterial hy...

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