ACMR

SEC source: 0001140361-21-008754 · form4.xml · derivative · entry 5

Cheav Sotheara · CIK 0001721279 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,000

Underlying: Class A Common Stock · 10,000 shares

Expires 2028-07-31

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 · kind: On March 15, 2021, the reporting person exercised a previously issued stock option to purchase 10,000 shares of Class A Common Stock of the Issuer.

F4 · derivative.exercise_date: The option vested and became exercisable as to 10,000 shares on August 1, 2019, and the remaining 30,000 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date.

SEC source: 0001140361-21-008754 · form4.xml · nonDerivative · entry 2

Cheav Sotheara · CIK 0001721279 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,334

F2 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-008754 · form4.xml · nonDerivative · entry 1

Cheav Sotheara · CIK 0001721279 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,334

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 · kind: On March 15, 2021, the reporting person exercised a previously issued stock option to purchase 10,000 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-008753 · form4.xml · derivative · entry 3

McKechnie Mark · CIK 0001775007 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,972

Underlying: Class A Common Stock · 10,028 shares

Expires 2028-07-31

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 · kind: On March 12, 2021, the reporting person exercised a previously issued stock option to purchase 10,028 shares of Class A Common Stock of the Issuer.

F3 · derivative.exercise_date: The option vested and became exercisable as to 10,000 shares on August 1, 2019, and the remaining 30,000 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date.

SEC source: 0001140361-21-008753 · form4.xml · nonDerivative · entry 2

McKechnie Mark · CIK 0001775007 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F2 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-008753 · form4.xml · nonDerivative · entry 1

McKechnie Mark · CIK 0001775007 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,028

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 · kind: On March 12, 2021, the reporting person exercised a previously issued stock option to purchase 10,028 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-008752 · form4.xml · derivative · entry 7

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 100,001 shares

Expires 2021-05-01

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.

F2 · kind: The option is fully vested and exercisable.

F2 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-21-008752 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 267,234

F1 · kind: On March 12, 2021, the reporting person exercised, by net exercise, a previously issued stock option to purchase 100,001 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 773 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on March 11, 2021 of $97.05, and issuing to the reporting person the remaining 99,228 shares of Class A Common Stock.

SEC source: 0001140361-21-008752 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 268,007

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 · kind: On March 12, 2021, the reporting person exercised, by net exercise, a previously issued stock option to purchase 100,001 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 773 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on March 11, 2021 of $97.05, and issuing to the reporting person the remaining 99,228 shares of Class A Common Stock.

SEC source: 0001140361-22-009174 · form4.xml · derivative · entry 12

McKechnie Mark · CIK 0001775007 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,672

Underlying: Class A Common Stock · 5,000 shares

Expires 2028-07-31

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.

F2 · kind: On March 10, 2022, the reporting person exercised a previously issued stock option to purchase 5,000 shares of Class A Common Stock of the Issuer.

F10 · derivative.exercise_date: The option vested and became exercisable as to 10,000 shares on August 1, 2019, and the remaining 30,000 shares vest and became or become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date.

SEC source: 0001140361-22-009174 · form4.xml · derivative · entry 11

McKechnie Mark · CIK 0001775007 · See Remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,672

Underlying: Class A Common Stock · 300 shares

Expires 2028-07-31

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 · kind: On March 9, 2022, the reporting person exercised a previously issued stock option to purchase 300 shares of Class A Common Stock of the Issuer.

F10 · derivative.exercise_date: The option vested and became exercisable as to 10,000 shares on August 1, 2019, and the remaining 30,000 shares vest and became or become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date.

SEC source: 0001140361-21-007698 · form4.xml · derivative · entry 4

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 12,334 shares

Expires 2027-03-08

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.

F3 · kind: On March 8, 2021, the reporting person exercised a previously issued stock option to purchase 12,334 shares of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-21-007698 · form4.xml · nonDerivative · entry 2

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,436

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.

F3 · kind: On March 8, 2021, the reporting person exercised a previously issued stock option to purchase 12,334 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-007698 · form4.xml · derivative · entry 3

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,334

Underlying: Class A Common Stock · 11,000 shares

Expires 2027-03-08

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 · kind: On March 4, 2021, the reporting person exercised a previously issued stock option to purchase 11,000 shares of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-21-007698 · form4.xml · nonDerivative · entry 1

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,102

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 · kind: On March 4, 2021, the reporting person exercised a previously issued stock option to purchase 11,000 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-007223 · form4.xml · derivative · entry 2

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,334

Underlying: Class A Common Stock · 10,000 shares

Expires 2027-03-08

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 · kind: On March 2, 2021, the reporting person exercised a previously issued stock option to purchase 10,000 shares of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-21-007223 · form4.xml · nonDerivative · entry 1

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,102

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 · kind: On March 2, 2021, the reporting person exercised a previously issued stock option to purchase 10,000 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-006959 · form4.xml · derivative · entry 2

Feng Lisa · CIK 0001779777 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,437

Underlying: Class A Common Stock · 3,470 shares

Expires 2027-11-01

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 · kind: On February 26, 2021, the reporting person exercised a previously issued stock option to purchase 3,470 shares of Class A Common Stock of the Issuer.

F2 · derivative.exercise_date: The option vested and became exercisable as to 4,167 shares on August 15, 2018 and the remaining 12,500 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date.

SEC source: 0001140361-21-006959 · form4.xml · nonDerivative · entry 1

Feng Lisa · CIK 0001779777 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,230

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 · kind: On February 26, 2021, the reporting person exercised a previously issued stock option to purchase 3,470 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-007226 · form4.xml · derivative · entry 1

Liu Tracy · CIK 0001721299 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Class A Common Stock · 5,000 shares

Expires 2031-02-21

F1 · derivative.exercise_date: The option will vest and become exercisable immediately prior to the 2022 Annual Meeting of Stockholders of the Issuer, subject to continued service through the vesting date.

SEC source: 0001140361-21-007223 · form4.xml · derivative · entry 3

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Class A Common Stock · 5,000 shares

Expires 2031-02-21

F3 · derivative.exercise_date: The option will vest and become exercisable immediately prior to the 2022 Annual Meeting of Stockholders of the Issuer, subject to continued service through the vesting date.

SEC source: 0001140361-21-007224 · form4.xml · derivative · entry 1

Dun Haiping · CIK 0001721581 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Class A Common Stock · 5,000 shares

Expires 2031-02-21

F1 · derivative.exercise_date: The option will vest and become exercisable immediately prior to the 2022 Annual Meeting of Stockholders of the Issuer, subject to continued service through the vesting date.

SEC source: 0001140361-21-007577 · form4.xml · derivative · entry 1

Liu Tracy · CIK 0001721299 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Class A Common Stock · 5,000 shares

Expires 2031-02-21

F1 · derivative.exercise_price: This Form 4 amendment has been filed solely to correct the exercise price of a previously issued stock option to purchase shares of Class A Common Stock of the Issuer reported in a Form 4 filed on March 3, 2021 (the "Form 4"). The exercise price was inadvertently stated as $119.98 in the Form 4. The exercise price should have been stated as $111.98 in the Form 4.

F2 · derivative.exercise_date: The option will vest and become exercisable immediately prior to the 2022 Annual Meeting of Stockholders of the Issuer, subject to continued service through the vesting date.

SEC source: 0001140361-21-007575 · form4.xml · derivative · entry 1

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Class A Common Stock · 5,000 shares

Expires 2031-02-21

F1 · derivative.exercise_price: This Form 4 amendment has been filed solely to correct the exercise price of a previously issued stock option to purchase shares of Class A Common Stock of the Issuer reported in a Form 4 filed on March 3, 2021 (the "Form 4"). The exercise price was inadvertently stated as $119.98 in the Form 4. The exercise price should have been stated as $111.98 in the Form 4.

F2 · derivative.exercise_date: The option will vest and become exercisable immediately prior to the 2022 Annual Meeting of Stockholders of the Issuer, subject to continued service through the vesting date.

SEC source: 0001140361-21-007578 · form4.xml · derivative · entry 1

Dun Haiping · CIK 0001721581 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Class A Common Stock · 5,000 shares

Expires 2031-02-21

F1 · derivative.exercise_price: This Form 4 amendment has been filed solely to correct the exercise price of a previously issued stock option to purchase shares of Class A Common Stock of the Issuer reported in a Form 4 filed on March 3, 2021 (the "Form 4"). The exercise price was inadvertently stated as $119.98 in the Form 4. The exercise price should have been stated as $111.98 in the Form 4.

F2 · derivative.exercise_date: The option will vest and become exercisable immediately prior to the 2022 Annual Meeting of Stockholders of the Issuer, subject to continued service through the vesting date.

SEC source: 0001140361-21-005068 · form4.xml · nonDerivative · entry 1

Liu Tracy · CIK 0001721299 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,924

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-005063 · form4.xml · nonDerivative · entry 1

Hu Chenming · CIK 0001316320 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,102

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-005065 · form4.xml · derivative · entry 3

Chen Fuping · CIK 0001729184 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,667

Underlying: Class A Common Stock · 30,000 shares

Expires 2026-12-27

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 · kind: On February 12, 2021, the reporting person exercised a previously issued stock option to purchase 30,000 shares of Class A Common Stock of the Issuer.

F3 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-21-005065 · form4.xml · nonDerivative · entry 2

Chen Fuping · CIK 0001729184 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F2 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-005065 · form4.xml · nonDerivative · entry 1

Chen Fuping · CIK 0001729184 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,000

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 · kind: On February 12, 2021, the reporting person exercised a previously issued stock option to purchase 30,000 shares of Class A Common Stock of the Issuer.

SEC source: 0001140361-21-004424 · form4.xml · nonDerivative · entry 2

Liu Tracy · CIK 0001721299 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,924

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-004424 · form4.xml · nonDerivative · entry 1

Liu Tracy · CIK 0001721299 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,524

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-21-000718 · form4.xml · nonDerivative · entry 1

Liu Tracy · CIK 0001721299 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,924

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-20-030086 · form4.xml · nonDerivative · entry 1

Wang Jian · CIK 0001721620 · See remarks

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 84,386

F1 · kind: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-20-029242 · form4.xml · nonDerivative · entry 4

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,506,170

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-029242 · form4.xml · nonDerivative · entry 3

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,521,090

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F5 · price: The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.00 to $75.50, inclusive.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-029242 · form4.xml · nonDerivative · entry 2

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,547,982

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F4 · price: The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.00 to $76.13, inclusive.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-029242 · form4.xml · nonDerivative · entry 1

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,549,681

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F2 · price: The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.00 to $75.91, 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 ranges set forth in footnotes 2, 4 and 5 of this Form 4.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-028759 · form4.xml · nonDerivative · entry 3

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,632,135

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F5 · price: The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.00 to $75.14, inclusive.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-028759 · form4.xml · nonDerivative · entry 2

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,635,349

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F4 · price: The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.00 to $76.25, inclusive.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-028759 · form4.xml · nonDerivative · entry 1

Xiang Yinan · CIK 0001721583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,646,567

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.

F2 · price: The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.00 to $75.90, 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 ranges set forth in footnotes 2, 4 and 5 of this Form 4.

F3 · ownership.nature: These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

SEC source: 0001140361-20-027554 · form4.xml · nonDerivative · entry 3

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 168,006

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-20-027554 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,328

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-20-027554 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 250,323

F1 · kind: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

SEC source: 0001140361-20-026750 · form4.xml · derivative · entry 10

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 100,001

Underlying: Class A Common Stock · 66,666 shares

Expires 2021-05-01

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.

F2 · kind: On November 25, 2020, the reporting person exercised, by net exercise, a previously issued stock option to purchase 66,666 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 678 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on November 24, 2020 of $73.76, and issuing to the reporting person the remaining 65,988 shares of Class A Common Stock.

F3 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-20-026750 · form4.xml · derivative · entry 9

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 33,334 shares

Expires 2021-05-01

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 · kind: On November 25, 2020, the reporting person exercised, by net exercise, a previously issued stock option to purchase 33,334 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 339 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on November 24, 2020 of $73.76, and issuing to the reporting person the remaining 32,995 shares of Class A Common Stock.

F3 · derivative.exercise_date: The option is fully vested and exercisable.

SEC source: 0001140361-20-026750 · form4.xml · nonDerivative · entry 4

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 266,989

F2 · kind: On November 25, 2020, the reporting person exercised, by net exercise, a previously issued stock option to purchase 66,666 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 678 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on November 24, 2020 of $73.76, and issuing to the reporting person the remaining 65,988 shares of Class A Common Stock.

SEC source: 0001140361-20-026750 · form4.xml · nonDerivative · entry 3

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 267,667

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.

F2 · kind: On November 25, 2020, the reporting person exercised, by net exercise, a previously issued stock option to purchase 66,666 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 678 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on November 24, 2020 of $73.76, and issuing to the reporting person the remaining 65,988 shares of Class A Common Stock.

SEC source: 0001140361-20-026750 · form4.xml · nonDerivative · entry 2

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 201,001

F1 · kind: On November 25, 2020, the reporting person exercised, by net exercise, a previously issued stock option to purchase 33,334 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 339 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on November 24, 2020 of $73.76, and issuing to the reporting person the remaining 32,995 shares of Class A Common Stock.

SEC source: 0001140361-20-026750 · form4.xml · nonDerivative · entry 1

Wang David H · CIK 0001721580 · Director · See remarks · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 201,340

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 · kind: On November 25, 2020, the reporting person exercised, by net exercise, a previously issued stock option to purchase 33,334 shares of Class A Common Stock of the Issuer. The reporting person paid the exercise price on a cashless basis, resulting in the Issuer withholding 339 shares of Class A Common Stock for payment of the exercise price, based on the closing price of the Issuer's Class A Common Stock on November 24, 2020 of $73.76, and issuing to the reporting person the remaining 32,995 shares of Class A Common Stock.