SEC Form 4 · accession 0001591747-26-000007
Disc Medicine, Inc. · IRON
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Kevin Bitterman
Director
Period of report
Sep 11, 2026
Accepted (ET)
Sep 15, 2026 · 4:30 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001816736
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Sep 11, 2026 | M | 7,136 | $45.69 | A | 7,136 | D | |
| Common Stock | Sep 11, 2026 | M | 10,000 | $38.85 | A | 17,136 | D | |
| Common Stock | Sep 11, 2026 | M | 10,000 | $50.86 | A | 27,136 | D | |
| Common StockF1 | Sep 11, 2026 | S | 27,136 | $70.11 | D | 0 | D | |
| Common StockF2 | holding | — | — | — | 318,866 | I | See footnote | |
| Common StockF3 | holding | — | — | — | 312,230 | I | See footnote | |
| Common StockF4 | holding | — | — | — | 13,427 | I | See footnote |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (Right to Buy)F5 | $45.69 | Sep 11, 2026 | M | 7,136 | D | — | Jun 8, 2033 | Common Stock | 7,136 | 0 | D |
| Stock Option (Right to Buy)F5 | $38.85 | Sep 11, 2026 | M | 10,000 | D | — | Jun 11, 2034 | Common Stock | 10,000 | 0 | D |
| Stock Option (Right to Buy)F5 | $50.86 | Sep 11, 2026 | M | 10,000 | D | — | Jun 10, 2035 | Common Stock | 10,000 | 0 | D |
Explanation of responses
- F1The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.10 to $70.37 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F2These shares are held by Atlas Venture Opportunity Fund I, L.P. ("Opportunity I"). The general partner of Opportunity I is Atlas Venture Associates Opportunity I, L.P. ("Associates I"). Atlas Venture Associates Opportunity I, LLC ("Associates I LLC") is the general partner of Associates I. The Reporting Person is a member of Associates I LLC and disclaims beneficial ownership of such securities held by Opportunity I, except to the extent of his pecuniary interest therein, if any.
- F3These shares are held by Atlas Venture Opportunity Fund II, L.P. ("Opportunity II"). The general partner of Opportunity II is Atlas Venture Associates Opportunity II, L.P. ("Associates II"). Atlas Venture Associates Opportunity II, LLC ("Associates II LLC") is the general partner of Associates II. The Reporting Person is a member of Associates II LLC and disclaims beneficial ownership of such securities held by Opportunity II, except to the extent of his pecuniary interest therein, if any.
- F4These shares are held by Atlas Venture Fund XII, L.P. ("Atlas XII"). The general partner of Atlas XII is Atlas Venture Associates XII, L.P. ("Associates XII"). Atlas Venture Associates XII, LLC ("Associates XII LLC") is the general partner of Associates XII. The Reporting Person is a member of Associates XII LLC and disclaims beneficial ownership of such securities held by Atlas XII, except to the extent of his pecuniary interest therein, if any.
- F5Fully vested and exercisable.