The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

This CUSIP number applies to the Issuer’s Class A Common Stock.

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL U.S. VENTURE FUND XV, L.P. (“SEQUOIA CAPITAL U.S. VENTURE FUND XV”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  1,993,573

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  1,993,573

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  1,993,573

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  3.1%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV, L.P. (“SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  30,179

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  30,179

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  30,179

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  Less than 0.1%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q), L.P. (“SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q)”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  84,020

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  84,020

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  84,020

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  0.1%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND, L.P. (“SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  306,629

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  306,629

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  306,629

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  0.5%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL U.S. GROWTH FUND VI, L.P. (“SEQUOIA CAPITAL U.S. GROWTH FUND VI”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  5,396,456

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  5,396,456

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  5,396,456

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  8.4%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS FUND VI, L.P. (“SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS FUND VI”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

  237,156

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

  237,156

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  237,156

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  0.4%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SC U.S. VENTURE XV MANAGEMENT, L.P. (“SC U.S. VENTURE XV MANAGEMENT”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

2,414,401, of which 1,993,573 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE FUND XV, 30,179 shares are directly owned by SEQUOIA CAPITAL U.S. PARTNERS FUND XV, 84,020 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q) and 306,629 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND. The General Partner of SEQUOIA CAPITAL U.S. VENTURE FUND XV, SEQUOIA CAPITAL U.S. PARTNERS FUND XV, SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q) and SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND is SC U.S. VENTURE XV MANAGEMENT.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

2,414,401, of which 1,993,573 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE FUND XV, 30,179 shares are directly owned by SEQUOIA CAPITAL U.S. PARTNERS FUND XV, 84,020 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q) and 306,629 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND. The General Partner of SEQUOIA CAPITAL U.S. VENTURE FUND XV, SEQUOIA CAPITAL U.S. PARTNERS FUND XV, SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q) and SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND is SC U.S. VENTURE XV MANAGEMENT.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  2,414,401

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  3.8%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SC U.S. GROWTH VI MANAGEMENT, L.P. (“SC U.S. GROWTH VI MANAGEMENT”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

5,633,612, of which 5,396,456 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH FUND VI and 237,156 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND. The General Partner of SEQUOIA CAPITAL U.S. GROWTH FUND VI and SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND is SC U.S. GROWTH VI MANAGEMENT.

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

5,633,612, of which 5,396,456 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH FUND VI and 237,156 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND. The General Partner of SEQUOIA CAPITAL U.S. GROWTH FUND VI and SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND is SC U.S. GROWTH VI MANAGEMENT.

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  5,633,612

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  8.8%¹

  TYPE OF REPORTING PERSON

  PN

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

  NAME OF REPORTING PERSON

  SC US (TTGP), LTD. (“SC US (TTGP)”)

  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

  (a)  ☐        (b)  ☐

  SEC USE ONLY

  CITIZENSHIP OR PLACE OF ORGANIZATION

  CAYMAN ISLANDS

NUMBER OF

SHARES

 BENEFICIALLY 

OWNED BY

EACH

REPORTING

PERSON

WITH

  SOLE VOTING POWER

  0

  SHARED VOTING POWER

8,048,013 shares, of which 1,993,573 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE FUND XV, 30,179 shares are directly owned by SEQUOIA CAPITAL U.S. PARTNERS FUND XV, 84,020 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q), 306,629 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND, 5,396,456 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH FUND VI and 237,156 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND. The General Partner of SEQUOIA CAPITAL U.S. VENTURE FUND XV, SEQUOIA CAPITAL U.S. PARTNERS FUND XV, SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q) and SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND is SC U.S. VENTURE XV MANAGEMENT. The General Partner of SEQUOIA CAPITAL U.S. GROWTH FUND VI and SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND is SC U.S. GROWTH VI MANAGEMENT. The General Partner of SC U.S. VENTURE XV MANAGEMENT and SC U.S. GROWTH VI MANAGEMENT is SC US (TTGP).

  SOLE DISPOSITIVE POWER

  0

  SHARED DISPOSITIVE POWER

8,048,013 shares, of which 1,993,573 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE FUND XV, 30,179 shares are directly owned by SEQUOIA CAPITAL U.S. PARTNERS FUND XV, 84,020 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q), 306,629 shares are directly owned by SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND, 5,396,456 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH FUND VI and 237,156 shares are directly owned by SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND. The General Partner of SEQUOIA CAPITAL U.S. VENTURE FUND XV, SEQUOIA CAPITAL U.S. PARTNERS FUND XV, SEQUOIA CAPITAL U.S. VENTURE PARTNERS FUND XV (Q) and SEQUOIA CAPITAL U.S. VENTURE XV PRINCIPALS FUND is SC U.S. VENTURE XV MANAGEMENT. The General Partner of SEQUOIA CAPITAL U.S. GROWTH FUND VI and SEQUOIA CAPITAL U.S. GROWTH PRINCIPALS VI FUND is SC U.S. GROWTH VI MANAGEMENT. The General Partner of SC U.S. VENTURE XV MANAGEMENT and SC U.S. GROWTH VI MANAGEMENT is SC US (TTGP).

  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

  8,048,013

  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

  ☐

  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

  12.5%¹

  TYPE OF REPORTING PERSON

  OO

Based on a total of 64,368,569 shares of common stock outstanding as of October 31, 2020, as reported in the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on November 12, 2020.

Name of Issuer:

Address of Issuer’s Principal Executive Offices:

Name of Persons Filing:

Address of Principal Business Office or, if none, Residence:

Citizenship:

CUSIP No.: 084310101

OWNERSHIP

OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

NOTICE OF DISSOLUTION OF GROUP.

CERTIFICATION