Kevin Bitterman sold $3.4M of Disc Medicine stock

By AlphaYouPublished Oct 21, 2026Form 4

Stocks in this disclosure

Reported activity

Bitterman Kevin

Reporting filer

Kevin Bitterman reported selling 41,825 shares of Disc Medicine, Inc. for about $3.4M ($80.13 a share on average). Form 4 filed Oct 21, 2026 lists 9 entries.

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Disclosed: Oct 21, 2026

Reported details

9 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Common Stock	Bitterman Kevin	2026-10-19	S	Sale	5937	79.97	312,929	2 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 5937 transaction Price Per Share: 79.97 id: F2 transaction Acquired Disposed Code: D shares Owned Following Transaction: 312929 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F3
Common Stock	Bitterman Kevin	2026-10-19	S	Sale	4942	79.97	307,288	2 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 4942 transaction Price Per Share: 79.97 id: F2 transaction Acquired Disposed Code: D shares Owned Following Transaction: 307288 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F4
Common Stock	Bitterman Kevin	2026-10-19	S	Sale	115	79.97	13,312	2 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 115 transaction Price Per Share: 79.97 id: F2 transaction Acquired Disposed Code: D shares Owned Following Transaction: 13312 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F5
Common Stock	Bitterman Kevin	2026-10-20	S	Sale	2869	79.95	310,060	1 day	Filed terms security Title: Common Stock transaction Date: 2026-10-20 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 2869 transaction Price Per Share: 79.95 id: F6 transaction Acquired Disposed Code: D shares Owned Following Transaction: 310060 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F3
Common Stock	Bitterman Kevin	2026-10-20	S	Sale	2388	79.95	304,900	1 day	Filed terms security Title: Common Stock transaction Date: 2026-10-20 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 2388 transaction Price Per Share: 79.95 id: F6 transaction Acquired Disposed Code: D shares Owned Following Transaction: 304900 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F4
Common Stock	Bitterman Kevin	2026-10-20	S	Sale	55	79.95	13,257	1 day	Filed terms security Title: Common Stock transaction Date: 2026-10-20 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 55 transaction Price Per Share: 79.95 id: F6 transaction Acquired Disposed Code: D shares Owned Following Transaction: 13257 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F5
Common Stock	Bitterman Kevin	2026-10-21	S	Sale	13783	80.23	296,277	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-21 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 13783 transaction Price Per Share: 80.23 id: F7 transaction Acquired Disposed Code: D shares Owned Following Transaction: 296277 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F3
Common Stock	Bitterman Kevin	2026-10-21	S	Sale	11470	80.23	293,430	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-21 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 11470 transaction Price Per Share: 80.23 id: F7 transaction Acquired Disposed Code: D shares Owned Following Transaction: 293430 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F4
Common Stock	Bitterman Kevin	2026-10-21	S	Sale	266	80.23	12,991	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-21 transaction Form Type: 4 transaction Code: S equity Swap Involved: 0 id: F1 transaction Shares: 266 transaction Price Per Share: 80.23 id: F7 transaction Acquired Disposed Code: D shares Owned Following Transaction: 12991 direct Or Indirect Ownership: I nature Of Ownership: See footnote id: F5

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-19
Code: S
Action: Sale
Quantity: 5937
Price: 79.97
Following holdings: 312,929
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 5937
transaction Price Per Share: 79.97
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 312929
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F3

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-19
Code: S
Action: Sale
Quantity: 4942
Price: 79.97
Following holdings: 307,288
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 4942
transaction Price Per Share: 79.97
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 307288
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F4

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-19
Code: S
Action: Sale
Quantity: 115
Price: 79.97
Following holdings: 13,312
Reporting delay: 2 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 115
transaction Price Per Share: 79.97
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 13312
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F5

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-20
Code: S
Action: Sale
Quantity: 2869
Price: 79.95
Following holdings: 310,060
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-20
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 2869
transaction Price Per Share: 79.95
id: F6
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 310060
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F3

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-20
Code: S
Action: Sale
Quantity: 2388
Price: 79.95
Following holdings: 304,900
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-20
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 2388
transaction Price Per Share: 79.95
id: F6
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 304900
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F4

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-20
Code: S
Action: Sale
Quantity: 55
Price: 79.95
Following holdings: 13,257
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-20
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 55
transaction Price Per Share: 79.95
id: F6
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 13257
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F5

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-21
Code: S
Action: Sale
Quantity: 13783
Price: 80.23
Following holdings: 296,277
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-21
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 13783
transaction Price Per Share: 80.23
id: F7
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 296277
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F3

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-21
Code: S
Action: Sale
Quantity: 11470
Price: 80.23
Following holdings: 293,430
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-21
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 11470
transaction Price Per Share: 80.23
id: F7
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 293430
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F4

Common Stock

Owner: Bitterman Kevin
Date: 2026-10-21
Code: S
Action: Sale
Quantity: 266
Price: 80.23
Following holdings: 12,991
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-21
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 266
transaction Price Per Share: 80.23
id: F7
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 12991
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F5

Purchases, sales, grants and option exercises are different transactions. The reported code identifies the action; it does not establish a motive.

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.
Bitterman Kevin: Director.
The filing reports a Rule 10b5-1 trading plan.
F1: Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026.
F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.2476 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.
F3: These 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.
F4: These 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.
F5: These 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.
F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.00 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.
F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.70 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.

Original sources

SEC ownership filing

Prepared automatically from public filing data. Report a correction.

Security

Owner

Date

Code

Action

Quantity

Price

Following holdings

Reporting delay

Filed terms and references

Common Stock

Bitterman Kevin

2026-10-19

Sale

5937

79.97

312,929

2 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 5937
transaction Price Per Share: 79.97
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 312929
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F3

Common Stock

Bitterman Kevin

2026-10-19

Sale

4942

79.97

307,288

2 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 4942
transaction Price Per Share: 79.97
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 307288
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F4

Common Stock

Bitterman Kevin

2026-10-19

Sale

115

79.97

13,312

2 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 115
transaction Price Per Share: 79.97
id: F2
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 13312
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F5

Common Stock

Bitterman Kevin

2026-10-20

Sale

2869

79.95

310,060

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-10-20
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 2869
transaction Price Per Share: 79.95
id: F6
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 310060
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F3

Common Stock

Bitterman Kevin

2026-10-20

Sale

2388

79.95

304,900

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-10-20
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 2388
transaction Price Per Share: 79.95
id: F6
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 304900
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F4

Common Stock

Bitterman Kevin

2026-10-20

Sale

79.95

13,257

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-10-20
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 55
transaction Price Per Share: 79.95
id: F6
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 13257
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F5

Common Stock

Bitterman Kevin

2026-10-21

Sale

13783

80.23

296,277

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-21
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 13783
transaction Price Per Share: 80.23
id: F7
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 296277
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F3

Common Stock

Bitterman Kevin

2026-10-21

Sale

11470

80.23

293,430

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-21
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 11470
transaction Price Per Share: 80.23
id: F7
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 293430
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F4

Common Stock

Bitterman Kevin

2026-10-21

Sale

266

80.23

12,991

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-21
transaction Form Type: 4
transaction Code: S
equity Swap Involved: 0
id: F1
transaction Shares: 266
transaction Price Per Share: 80.23
id: F7
transaction Acquired Disposed Code: D
shares Owned Following Transaction: 12991
direct Or Indirect Ownership: I
nature Of Ownership: See footnote
id: F5

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.

Bitterman Kevin: Director.

The filing reports a Rule 10b5-1 trading plan.

F1: Shares were sold pursuant to a Rule 10b5-1 trading plan adopted on July 30, 2026.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.2476 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.

F3: These 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.

F4: These 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.

F5: These 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.

F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.00 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.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.95 to $80.70 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.