John D. Quisel

Insider Reports History

Reporting-owner location: Cambridge, MA
Latest reporting-owner signature: /s/ Christian Waage, Attorney-in-Fact
Transaction source note: Rows are grouped by transaction date from the original SEC filing. Open the aggregated insider activity page to review issuer-level activity across dates.

Reported holdings for John D. Quisel

Form 4 holding Chief Executive Officer, Director

Disc Medicine, Inc.

Security class: Common Stock
Shares / value: 226,064
Estimated value: $14,210,383
Report date: 17 Feb 2026
Price: $62.86
Ownership: Direct

Form 4 holding Director

Gossamer Bio, Inc.

Security class: Stock Option (Right to Buy)
Shares / value: 115,000
Estimated value
Report date: 04 Jun 2026
Price
Ownership: Direct
Underlying class: Common Stock
Underlying amount

Form 4 holding Chief Executive Officer, Director

Disc Medicine, Inc.

Security class: Stock Option (Right to Buy)
Shares / value: 82,800
Estimated value
Report date: 10 Feb 2026
Price
Ownership: Direct
Underlying class: Common Stock
Underlying amount

Insider Reports Filed by John D. Quisel

4 GOSS

Gossamer Bio, Inc.

Report period: 04 Jun 2026
Transactions: 1
Transaction value: $0
Accepted by SEC: 05 Jun 2026, 17:45
Role: Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 17 Feb 2026
Transactions: 1
Transaction value: -$833,775
Accepted by SEC: 17 Feb 2026, 21:03
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 10 Feb 2026
Transactions: 2
Transaction value: $0
Accepted by SEC: 11 Feb 2026, 19:12
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 19 Dec 2025
Transactions: 2
Transaction value: +$12,423
Accepted by SEC: 19 Dec 2025, 18:16
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 11 Dec 2025
Transactions: 6
Transaction value: -$3,327,531
Accepted by SEC: 15 Dec 2025, 17:49
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 09 Sep 2025
Transactions: 2
Transaction value: +$10,100
Accepted by SEC: 11 Sep 2025, 18:00
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 09 Jul 2025
Transactions: 4
Transaction value: -$1,582,397
Accepted by SEC: 11 Jul 2025, 16:48
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 03 Jul 2025
Transactions: 3
Transaction value: -$235,182
Accepted by SEC: 08 Jul 2025, 20:19
Role: Chief Executive Officer, Director
Next action: Open filing details

4 GOSS

Gossamer Bio, Inc.

Report period: 25 Jun 2025
Transactions: 1
Transaction value: $0
Accepted by SEC: 26 Jun 2025, 16:37
Role: Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 07 Apr 2025
Transactions: 2
Transaction value: +$7,070
Accepted by SEC: 08 Apr 2025, 20:22
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 18 Feb 2025
Transactions: 1
Transaction value: -$304,229
Accepted by SEC: 20 Feb 2025, 19:27
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 10 Feb 2025
Transactions: 2
Transaction value: $0
Accepted by SEC: 12 Feb 2025, 18:35
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 30 Dec 2024
Transactions: 6
Transaction value: -$667,659
Accepted by SEC: 02 Jan 2025, 19:13
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 23 Dec 2024
Transactions: 5
Transaction value: -$1,198,834
Accepted by SEC: 26 Dec 2024, 17:18
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 16 Dec 2024
Transactions: 6
Transaction value: -$831,395
Accepted by SEC: 18 Dec 2024, 19:41
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 08 Jul 2024
Transactions: 2
Transaction value: +$3,030
Accepted by SEC: 10 Jul 2024, 16:15
Role: Chief Executive Officer, Director
Next action: Open filing details

4 GOSS

Gossamer Bio, Inc.

Report period: 06 Jun 2024
Transactions: 1
Transaction value: $0
Accepted by SEC: 06 Jun 2024, 21:59
Role: Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 10 Jan 2024
Transactions: 2
Transaction value: $0
Accepted by SEC: 01 Mar 2024, 19:42
Role: Chief Executive Officer, Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 29 Dec 2023
Transactions: 2
Transaction value: +$2,727
Accepted by SEC: 03 Jan 2024, 16:05
Role: Chief Executive Officer, Director
Next action: Open filing details

4 GOSS

Gossamer Bio, Inc.

Report period: 28 Nov 2023
Transactions: 1
Transaction value: $0
Accepted by SEC: 29 Nov 2023, 18:38
Role: Director
Next action: Open filing details

3 GOSS

Gossamer Bio, Inc.

Report period: 28 Nov 2023
Transactions: 0
Transaction value: $0
Accepted by SEC: 29 Nov 2023, 18:32
Role: Director
Next action: Open filing details

4 IRON

Disc Medicine, Inc.

Report period: 29 Dec 2022
Transactions: 1
Transaction value: $0
Accepted by SEC: 03 Jan 2023, 16:05
Role: Chief Executive Officer, Director
Next action: Open filing details

3 IRON

Disc Medicine, Inc.

Report period: 29 Dec 2022
Transactions: 0
Transaction value: $0
Accepted by SEC: 03 Jan 2023, 16:00
Role: Chief Executive Officer, Director
Next action: Open filing details

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