SEC Form 4 reporting owner

Quisel John D

Quisel John D has filed 25 Form 4 transactions reported between December 11, 2025 and September 23, 2026, as Director of Gossamer Bio, Inc. and Chief Executive Officer of Disc Medicine, Inc..

Name as filed: Quisel John D

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$12.0M

14 lines

Companies

with Form 4 filings

Latest transaction

Sep 23, 2026

transaction date

Roles and reported holdings

GOSSGossamer Bio, Inc.
Jun 4, 2026 – Sep 23, 2026
Director
No common-stock holding reported on a purchase, sale, gift or withholding line.
IRONDisc Medicine, Inc.
Dec 11, 2025 – Sep 15, 2026
Chief Executive Officer
Held directly226,064 sh as of Aug 17, 2026 · Form 4
24 months: $12.0M sold

Transaction history

All 25 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Sep 23, 2026	GOSSDirector	Grant or awardCode A · direct	10,000	—	—	10,000	Form 4
Sep 15, 2026	IRONChief Executive Officer	Option exerciseCode M · direct	36,000	$1.01	$36K@ $1.01	262,064	Form 4
Aug 17, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	11,888	$79.84	$949K@ $79.84	226,064	Form 4
Aug 17, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	12,712	$79.20	$1.0M@ $79.20	237,952	Form 4
Aug 17, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	8,400	$78.11	$656K@ $78.11	250,664	Form 4
Aug 17, 2026	IRONChief Executive Officer	Option exerciseCode M · direct	33,000	$13.50	$446K@ $13.50	259,064	Form 4
Jul 13, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	6,400	$76.05	$487K@ $76.05	226,064	Form 4
Jul 13, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	16,896	$74.95	$1.3M@ $74.95	232,464	Form 4
Jul 13, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	9,704	$74.27	$721K@ $74.27	249,360	Form 4
Jul 13, 2026	IRONChief Executive Officer	Option exerciseCode M · direct	7,416	$13.50	$100K@ $13.50	259,064	Form 4
Jul 13, 2026	IRONChief Executive Officer	Option exerciseCode M · direct	25,584	$9.86	$252K@ $9.86	251,648	Form 4
Jun 18, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	1,551	$71.61	$111K@ $71.61	226,064	Form 4
Jun 18, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	9,522	$70.70	$673K@ $70.70	227,615	Form 4
Jun 18, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	22,927	$69.92	$1.6M@ $69.92	237,137	Form 4
Jun 18, 2026	IRONChief Executive Officer	Option exerciseCode M · direct	34,000	$9.86	$335K@ $9.86	260,064	Form 4
Jun 4, 2026	GOSSDirector	Grant or awardCode A · direct	115,000	—	—	115,000	Form 4
Feb 17, 2026	IRONChief Executive Officer	Open-market saleCode S · direct	13,264	$62.86	$834K@ $62.86	226,064	Form 4
Feb 10, 2026	IRONChief Executive Officer	Grant or awardCode A · direct	82,800	—	—	82,800	Form 4
Feb 10, 2026	IRONChief Executive Officer	Grant or awardCode A · direct	55,200	—	—	239,328	Form 4
Dec 19, 2025	IRONChief Executive Officer	Option exerciseCode M · direct	12,300	$1.01	$12K@ $1.01	184,128	Form 4
Dec 11, 2025	IRONChief Executive Officer	Open-market saleCode S · direct	16,888	$93.65	$1.6M@ $93.65	171,828	Form 4
Dec 11, 2025	IRONChief Executive Officer	Open-market saleCode S · direct	16,356	$92.96	$1.5M@ $92.96	188,716	Form 4
Dec 11, 2025	IRONChief Executive Officer	Open-market saleCode S · direct	4,337	$92.21	$400K@ $92.21	205,072	Form 4
Dec 11, 2025	IRONChief Executive Officer	Open-market saleCode S · direct	2,419	$90.97	$220K@ $90.97	209,409	Form 4
Dec 11, 2025	IRONChief Executive Officer	Option exerciseCode M · direct	40,000	$9.86	$394K@ $9.86	211,828	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.