| Accession Number: | 0001209191-21-057041 |
| Date: | 2021-09-17 |
| Issuer: | GENERATION BIO CO. (GBIO) |
| Original Submission Date: |
ATLAS VENTURE FUND X, L.P.
300 TECHNOLOGY SQUARE, 8TH FLOOR
CAMBRIDGE, MA 02139
ATLAS VENTURE OPPORTUNITY FUND I, L.P.
300 TECHNOLOGY SQUARE, 8TH FLOOR
CAMBRIDGE, MA 02139
| Title of Security | Transaction Date | 2a. Deemed Execution Date | Transaction Code | Shares | Acquired or Disposed | Price per share | 5. Amount of Securities Beneficially Owned Following Reported Transaction | 6. Ownership Form Direct or Indirect | Nature of Indirect Ownership |
|---|---|---|---|---|---|---|---|---|---|
| COMMON STOCK | 2021-09-17 | J | 1,000,000 | d | $0.00 | 7,111,939 | direct | ||
| COMMON STOCK | 2021-09-17 | J | 100,000 | d | $0.00 | 1,166,937 | indirect |
| Title of Derivative Security | Conversion or Exercise Price of Derivative Security | Transaction Date | Deemed Execution Date | Transaction Code | Number of Derivative Securities Acquired (A) or Disposed of (D) | Date Exercisable | Expiration Date | Title and Amount of Securities Underlying Derivative Security | Price of Derivative Security | Number of derivative Securities Beneficially Owned Following Reported Transaction(s) | Ownership Form: Direct (D) or Indirect (I) | Nature of Indirect Beneficial Ownership |
|---|
| ID | footnote |
|---|---|
| f1 | represents a pro rata distribution, and not a purchase or sale of securities, by atlas venture fund x, l.p. ("atlas venture fund x") to its general partner and limited partners without additional consideration. this distribution was effected pursuant to a plan adopted by atlas venture fund x pursuant to rule 10b5-1 on april 20, 2021. |
| f2 | represents a pro rata distribution, and not a purchase or sale of securities, by atlas venture opportunity fund i, lp ("avof i") to its general partner and limited partners without additional consideration. this distribution was effected pursuant to a plan adopted by avof i pursuant to rule 10b5-1 on april 20, 2021. |
| f3 | the shares are owned directly by avof i. |
