GARDNER JASON

SEC source: 0000899243-22-037431 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 292,872

F1 · kind: The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the Magenta Therapeutics, Inc. 2019 Employee Stock Purchase Plan (the "ESPP") for the ESPP purchase period of June 1, 2022 through November 30, 2022. This transaction is exempt under both Rule 16b-3(c) and Rule 16b-3(d).

F2 · price: In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on June 1, 2022.

SEC source: 0000899243-22-027271 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 187,500

Underlying: Common Stock · 187,500 shares

Expires 2032-07-31

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is August 1, 2022.

SEC source: 0000899243-22-021184 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 289,872

F1 · kind: The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the Magenta Therapeutics, Inc. 2019 Employee Stock Purchase Plan (the "ESPP") for the ESPP purchase period of December 1, 2021 through May 31, 2022. This transaction is exempt under both Rule 16b-3(c) and Rule 16b-3(d).

F2 · price: In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on May 31, 2022.

SEC source: 0000899243-22-018817 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 162,500

Underlying: Common Stock · 162,500 shares

Expires 2032-05-16

F1 · derivative.exercise_date: This option shall vest and become exercisable in three equal installments, each installment vesting every six months, over the 18 months following the vesting commencement date. The vesting commencement date is May 15, 2022.

SEC source: 0000899243-22-006830 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 187,500

Underlying: Common Stock · 187,500 shares

Expires 2032-02-14

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on the first quarter following the vesting commencement date. The vesting commencement date is February 1, 2022.

SEC source: 0000899243-21-036599 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 286,872

F1 · kind: This transaction represents shares sold solely to pay taxes due upon the vesting of restricted stock units, as disclosed by the reporting person on the Form 4 filed on September 16, 2021.

F2 · price: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.60 to $6.87, inclusive. The reporting person undertakes to provide 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.

SEC source: 0000899243-21-036335 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 301,212

F1 · kind: On February 11, 2021, the reporting person was granted 100,000 restricted stock units. The restricted stock units vest in two equal installments subject to the achievement of certain performance milestones related to the issuer's business plans. The first performance milestone was achieved, resulting in vesting of 50,000 restricted stock units and the corresponding issuance of 50,000 shares of issuer common stock.

SEC source: 0000899243-21-031272 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,500

Underlying: Common Stock · 112,500 shares

Expires 2031-08-01

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on August 2, 2021.

SEC source: 0000899243-21-006710 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 112,500

Underlying: Common Stock · 112,500 shares

Expires 2031-02-10

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2021.

SEC source: 0000899243-20-004301 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 275,000

Underlying: Common Stock · 275,000 shares

Expires 2030-02-09

F1 · derivative.exercise_date: This option shall vest and become exercisable in 16 equal quarterly installments beginning on January 1, 2020.

SEC source: 0001562180-20-000327 · primarydocument.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 251,212

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $15.10 to $15.58. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request by the staff of the U.S. Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-20-000118 · primarydocument.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 262,412

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

SEC source: 0001562180-19-006252 · primarydocument.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 265,212

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $15.10 to $15.13. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-19-006221 · primarydocument.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 268,109

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $15.10 to $15.49. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-19-006078 · primarydocument.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 344,820

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

SEC source: 0001562180-19-003623 · primarydocument.xml · nonDerivative · entry 2

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 349,212

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

F2 · price: This transaction was executed in multiple trades at prices ranging from $15.10 to $15.23. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request by the staff of the U.S. Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

SEC source: 0001562180-19-003623 · primarydocument.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 361,543

F1 · kind: This trade is pursuant to an active 10b5-1 plan.

SEC source: 0000899243-19-002869 · doc4.xml · derivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 182,900

Underlying: Common Stock · 182,900 shares

Expires 2029-02-04

F1 · derivative.exercise_date: This option shall vest and become exercisable in 12 equal quarterly installments beginning on January 1, 2019.

SEC source: 0000899243-18-018316 · doc4.xml · derivative · entry 8

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By J.P. Gardner Irrevocable Trust

Disclosed balance after: 0

Underlying: Common Stock · 8,304 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · ownership.direct: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

SEC source: 0000899243-18-018316 · doc4.xml · derivative · entry 7

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By P.S. Gardner Irrevocable Trust

Disclosed balance after: 0

Underlying: Common Stock · 7,474 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · ownership.direct: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

SEC source: 0000899243-18-018316 · doc4.xml · derivative · entry 6

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By J.P. Gardner Irrevocable Trust

Disclosed balance after: 0

Underlying: Common Stock · 5,804 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · ownership.direct: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

SEC source: 0000899243-18-018316 · doc4.xml · derivative · entry 5

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By P.S. Gardner Irrevocable Trust

Disclosed balance after: 0

Underlying: Common Stock · 14,203 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · ownership.direct: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

SEC source: 0000899243-18-018316 · doc4.xml · derivative · entry 4

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By J.P. Gardner Irrevocable Trust

Disclosed balance after: 0

Underlying: Common Stock · 11,611 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.exercise_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

F1 · ownership.direct: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

SEC source: 0000899243-18-018316 · doc4.xml · nonDerivative · entry 3

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 363,212

F2 · shares: Reflects shares that were purchased through a directed share program in connection with the Issuer's initial public offering.

SEC source: 0000899243-18-018316 · doc4.xml · nonDerivative · entry 2

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By P.S. Gardner Irrevocable Trust

Disclosed balance after: 359,092

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.

SEC source: 0000899243-18-018316 · doc4.xml · nonDerivative · entry 1

GARDNER JASON · CIK 0001741286 · Director · See Remarks

10b5-1 filing: Not disclosed

Ownership: Indirect · By J.P. Gardner Irrevocable Trust

Disclosed balance after: 292,990

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: The Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") converted into Common Stock on a 2.58398:1 basis upon the closing of the Issuer's initial public offering on June 25, 2018. The Preferred Stock had no expiration date.