BL

SEC source: 0001209191-18-018048 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,812

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). 25% of the RSUs will vest on the one (1) year anniversary of February 20, 2018 (the "Vesting Commencement Date"), and 1/16th of the RSUs will vest every three months thereafter on the same day of the month as the Vesting Commencement Date, subject to the Reporting Person's continued service through each vesting date.

SEC source: 0001209191-18-018061 · doc4.xml · derivative · entry 2

PRAGER MORGAN KAROLE · CIK 0001183627 · Chief Legal Officer & Sec'y

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,300

Underlying: Common Stock · 28,300 shares

Expires 2028-03-05

F2 · derivative.exercise_date: 25% of the shares subject to the option will vest on the one (1) year anniversary of the Vesting Commencement Date, and 1/16th of the shares subject to the option will vest every three months thereafter on the same day of the month as the Vesting Commencement Date, subject to the Reporting Person's continued service through each vesting date.

SEC source: 0001209191-18-018061 · doc4.xml · nonDerivative · entry 1

PRAGER MORGAN KAROLE · CIK 0001183627 · Chief Legal Officer & Sec'y

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,592

F1 · shares: Each share is represented by a Restricted Stock Unit ("RSU"). 25% of the RSUs will vest on the one (1) year anniversary of February 20, 2018 (the "Vesting Commencement Date"), and 1/16th of the RSUs will vest every three months thereafter on the same day of the month as the Vesting Commencement Date, subject to the Reporting Person's continued service through each vesting date.

SEC source: 0001209191-22-009237 · doc4a.xml · derivative · entry 1

Villanova Patrick · CIK 0001688119 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,560

Underlying: Common Stock · 10,560 shares

Expires 2028-03-05

F1 · shares: This amendment (this "Amendment") is being filed to correct the number of shares subject to an option grant reported on the original Form 4 filed on March 8, 2018. Subsequent to the filing of the original Form 4, the number of shares subject to the option was determined to contain an error and was corrected as reported in this amendment.

F2 · derivative.exercise_date: 25% of the shares subject to the Option will vest on the one (1) year anniversary of February 20, 2018 (the "Vesting Commencement Date"), and 1/16th of the shares subject to the Option will vest every three months thereafter on the same day of the month as the Vesting Commencement Date, subject to the Reporting Person's continued service through each vesting date.

SEC source: 0001209191-18-017745 · doc4.xml · derivative · entry 5

Unterman Thomas · CIK 0001299455 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,500

Underlying: Common Stock · 12,500 shares

Expires 2024-03-02

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

SEC source: 0001209191-18-017745 · doc4.xml · nonDerivative · entry 3

Unterman Thomas · CIK 0001299455 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,807

SEC source: 0001209191-18-017745 · doc4.xml · nonDerivative · entry 2

Unterman Thomas · CIK 0001299455 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,807

F1 · shares: Represents shares withheld to pay the exercise price of the Reporting Person's option.

SEC source: 0001209191-18-017745 · doc4.xml · nonDerivative · entry 1

Unterman Thomas · CIK 0001299455 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,219

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.

SEC source: 0001209191-18-010385 · doc4.xml · derivative · entry 2

Huffman Marc · CIK 0001603951 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Common Stock · 200,000 shares

Expires 2028-02-12

F2 · derivative.exercise_date: Shares subject to the option vest in four equal annual installments beginning on the Award Date, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0001209191-18-010385 · doc4.xml · nonDerivative · entry 1

Huffman Marc · CIK 0001603951 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,000

F1 · shares: The reported securities awarded on February 13, 2018 (the "Award Date") represent restricted stock units which vest in four equal annual installments beginning on the Award Date, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0000899243-17-028257 · doc4.xml · nonDerivative · entry 2

SLTA Sumeru (GP), L.L.C. · CIK 0001463527 · 10% owner

Silver Lake Group, L.L.C. · CIK 0001418226 · 10% owner

SHAH AJAY · CIK 0001008036 · 10% owner

Silver Lake Technology Associates Sumeru, L.P. · CIK 0001463521 · 10% owner

Silver Lake Sumeru Fund LP · CIK 0001410377 · 10% owner

Silver Lake Technology Investors Sumeru, L.P. · CIK 0001463520 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · Held through Silver Lake Technology Investors Sumeru, L.P.

Disclosed balance after: 111,026

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriter in the secondary offering of $34.07 per share.

F4 · ownership.nature: SLG and Shah are the managing members of SLTA, which is the general partner of SLT LP, which is the general partner of Silver Lake Technology Investors Sumeru, L.P. ("SLTI", and collectively with SLG, Shah, SLTA, SLT LP and SLSF, the "Reporting Persons"), which directly holds these shares of Common Stock.

F5 · ownership.nature: As the general partner of each of SLSF and SLTI, SLT LP may be deemed to share voting and dispositive power with respect to the Common Stock directly held by SLSF and SLTI (the "Silver Lake Sumeru Shares"). As the general partner of SLT LP, SLTA may be deemed to share voting and dispositive power with respect to the Silver Lake Sumeru Shares. As the managing members of SLTA, SLG and Shah may each be deemed to share voting and dispositive power with respect to the Silver Lake Sumeru Shares.

F6 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.

F7 · ownership.nature: Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.

SEC source: 0000899243-17-028257 · doc4.xml · nonDerivative · entry 1

SLTA Sumeru (GP), L.L.C. · CIK 0001463527 · 10% owner

Silver Lake Group, L.L.C. · CIK 0001418226 · 10% owner

SHAH AJAY · CIK 0001008036 · 10% owner

Silver Lake Technology Associates Sumeru, L.P. · CIK 0001463521 · 10% owner

Silver Lake Sumeru Fund LP · CIK 0001410377 · 10% owner

Silver Lake Technology Investors Sumeru, L.P. · CIK 0001463520 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · Held through Silver Lake Sumeru Fund, L.P.

Disclosed balance after: 12,432,847

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriter in the secondary offering of $34.07 per share.

F3 · ownership.nature: Silver Lake Group, L.L.C. ("SLG") and Ajay Shah ("Shah") are the managing members of SLTA Sumeru (GP), L.L.C. ("SLTA"), which is the general partner of Silver Lake Technology Associates Sumeru, L.P. ("SLT LP"), which is the general partner of Silver Lake Sumeru Fund, L.P. ("SLSF"), which directly holds these shares of Common Stock.

F5 · ownership.nature: As the general partner of each of SLSF and SLTI, SLT LP may be deemed to share voting and dispositive power with respect to the Common Stock directly held by SLSF and SLTI (the "Silver Lake Sumeru Shares"). As the general partner of SLT LP, SLTA may be deemed to share voting and dispositive power with respect to the Silver Lake Sumeru Shares. As the managing members of SLTA, SLG and Shah may each be deemed to share voting and dispositive power with respect to the Silver Lake Sumeru Shares.

F6 · ownership.nature: Each Reporting Person disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein, if any.

F7 · ownership.nature: Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.

SEC source: 0000899243-17-028348 · doc4.xml · nonDerivative · entry 4

ICONIQ Strategic Partners, L.P. · CIK 0001575779 · 10% owner

ICONIQ Strategic Partners-B, L.P. · CIK 0001584545 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., BL Series · CIK 0001585870 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., Series BL2 · CIK 0001623300 · 10% owner

ICONIQ Strategic Partners GP, L.P. · CIK 0001688390 · 10% owner

ICONIQ Strategic Partners TT GP, Ltd. · CIK 0001688389 · 10% owner

Makan Divesh · CIK 0001688143 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 188,594

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F6 · ownership.direct: ICONIQ Strategic Partners Co-Invest, L.P., BL2 Series ("ICONIQ BL2") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. Divesh Makan ("Makan") is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: Each of ICONIQ GP, ICONIQ Parent GP and Makan disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028348 · doc4.xml · nonDerivative · entry 3

ICONIQ Strategic Partners, L.P. · CIK 0001575779 · 10% owner

ICONIQ Strategic Partners-B, L.P. · CIK 0001584545 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., BL Series · CIK 0001585870 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., Series BL2 · CIK 0001623300 · 10% owner

ICONIQ Strategic Partners GP, L.P. · CIK 0001688390 · 10% owner

ICONIQ Strategic Partners TT GP, Ltd. · CIK 0001688389 · 10% owner

Makan Divesh · CIK 0001688143 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,307,091

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F5 · ownership.direct: ICONIQ Strategic Partners Co-Invest, L.P., BL Series ("ICONIQ BL") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. Divesh Makan ("Makan") is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: Each of ICONIQ GP, ICONIQ Parent GP and Makan disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028348 · doc4.xml · nonDerivative · entry 2

ICONIQ Strategic Partners, L.P. · CIK 0001575779 · 10% owner

ICONIQ Strategic Partners-B, L.P. · CIK 0001584545 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., BL Series · CIK 0001585870 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., Series BL2 · CIK 0001623300 · 10% owner

ICONIQ Strategic Partners GP, L.P. · CIK 0001688390 · 10% owner

ICONIQ Strategic Partners TT GP, Ltd. · CIK 0001688389 · 10% owner

Makan Divesh · CIK 0001688143 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,044,360

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F4 · ownership.direct: ICONIQ Strategic Partners-B, L.P. ("ICONIQ B") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. Divesh Makan ("Makan") is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: Each of ICONIQ GP, ICONIQ Parent GP and Makan disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028348 · doc4.xml · nonDerivative · entry 1

ICONIQ Strategic Partners, L.P. · CIK 0001575779 · 10% owner

ICONIQ Strategic Partners-B, L.P. · CIK 0001584545 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., BL Series · CIK 0001585870 · 10% owner

ICONIQ Strategic Partners Co-Invest, L.P., Series BL2 · CIK 0001623300 · 10% owner

ICONIQ Strategic Partners GP, L.P. · CIK 0001688390 · 10% owner

ICONIQ Strategic Partners TT GP, Ltd. · CIK 0001688389 · 10% owner

Makan Divesh · CIK 0001688143 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,161,131

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F3 · ownership.direct: ICONIQ Strategic Partners, L.P. ("ICONIQ") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. Divesh Makan ("Makan") is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: Each of ICONIQ GP, ICONIQ Parent GP and Makan disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028346 · doc4.xml · nonDerivative · entry 4

Griffith William J.G. · CIK 0001688124 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 188,594

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F6 · ownership.direct: ICONIQ Strategic Partners Co-Invest, L.P., BL2 Series ("ICONIQ BL2") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

F7 · ownership.nature: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.nature: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028346 · doc4.xml · nonDerivative · entry 3

Griffith William J.G. · CIK 0001688124 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,307,091

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F5 · ownership.direct: ICONIQ Strategic Partners Co-Invest, L.P., BL Series ("ICONIQ BL") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

F7 · ownership.nature: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.nature: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028346 · doc4.xml · nonDerivative · entry 2

Griffith William J.G. · CIK 0001688124 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,044,360

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F4 · ownership.direct: ICONIQ Strategic Partners-B, L.P. ("ICONIQ B") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

F7 · ownership.nature: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.nature: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0000899243-17-028346 · doc4.xml · nonDerivative · entry 1

Griffith William J.G. · CIK 0001688124 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 4,161,131

F1 · shares: Represents shares of BlackLine, Inc.'s (the "Issuer") Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriters in the secondary offering of $34.07 per share.

F3 · ownership.direct: ICONIQ Strategic Partners, L.P. ("ICONIQ") is the direct owner of these securities.

F7 · ownership.direct: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.direct: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

F7 · ownership.nature: Iconiq Strategic Partners GP, L.P. ("ICONIQ GP") is the sole general partner of each of ICONIQ, ICONIQ B, ICONIQ BL and ICONIQ BL2 (collectively, the "Funds"). ICONIQ Strategic Partners TT GP, Ltd. (the "ICONIQ Parent GP") is the sole general partner of ICONIQ GP. The Reporting Person is an equity holder and director of ICONIQ Parent GP.

F8 · ownership.nature: The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.

SEC source: 0001209191-17-065011 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 2,707,163

F1 · shares: Represents shares of BlackLine, Inc.'s Common Stock sold in an underwritten secondary offering.

F2 · price: Represents the sale price to the underwriter in the secondary offering of $34.07 per share.

SEC source: 0001209191-17-063982 · doc4.xml · nonDerivative · entry 2

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,141,946

F1 · kind: The shares subject to the option vest in 4 equal, annual installments beginning on the one year anniversary of March 3, 2014.

F3 · price: The sale price represents the weighted average price of the shares sold ranging from $36.25 to $36.53 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-063982 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,144,896

F1 · kind: The shares subject to the option vest in 4 equal, annual installments beginning on the one year anniversary of March 3, 2014.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $35.24 to $36.20 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-063258 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,154,696

F1 · date: Due to an administrative error, the Form 4 was filed late on December 1, 2017.

F2 · shares: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F3 · price: The sale price represents the weighted average price of the shares sold ranging from $37.97 to $38.79 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 10

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: Tucker Seimetz Safety Net Grat

Disclosed balance after: 270,916

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 9

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: SAFETY NET GRAT dated 9/28/2015

Disclosed balance after: 0

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 8

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: Brian & Therese Tucker Living Trust

Disclosed balance after: 3,532,610

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 7

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,000

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 6

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: Brian & Therese Tucker Living Trust

Disclosed balance after: 127,665

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 5

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: SAFETY NET GRAT dated 9/28/2015

Disclosed balance after: 270,916

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 4

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: Claire Seimetz 2015 Trust

Disclosed balance after: 54,074

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 3

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: CS 2015 GRAT dated 9/28/2015

Disclosed balance after: 0

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 2

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: Brian & Therese Tucker Living Trust

Disclosed balance after: 21,278

SEC source: 0000899243-18-003875 · doc5.xml · nonDerivative · entry 1

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By: CS 2015 GRAT dated 9/28/2015

Disclosed balance after: 54,074

SEC source: 0001209191-17-061865 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,167,446

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $36.54 to $37.39 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-061261 · doc4.xml · nonDerivative · entry 1

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · SAFETY NET GRAT dated 9/28/2015

Disclosed balance after: 375,303

F1 · shares: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on September 13, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $35.04 to $35.40 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

F3 · balance_after: Totals reflect scheduled distributions of common stock to Ms. Tucker from the Safety Net GRAT dated 9/28/2015 and the CS 2015 GRAT dated 9/28/2015.

SEC source: 0001209191-18-009967 · doc4a.xml · nonDerivative · entry 1

Tucker Therese · CIK 0001688365 · Director · Chief Executive Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,422,945

F1 · shares: The sale transaction reported on this amended Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 13, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $35.04 to $35.40 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this amended Form 4.

F3 · balance_after: This amended Form 4 corrects the original Form 4 filed on November 16, 2017, which incorrectly reported that the sale of 2,000 shares of the Issuer's common stock was made by the Safety Net GRAT dated 9/28/2015 rather than by the Reporting Person.

SEC source: 0001209191-17-060668 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,180,196

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $35.22 to $35.77 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-059663 · doc4.xml · nonDerivative · entry 2

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,192,946

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F3 · price: The sale price represents the weighted average price of the shares sold ranging from $35.27 to $35.46 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-059663 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,199,971

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $34.20 to $35.19 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-058469 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,205,696

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $34.95 to $35.54 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-057978 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,218,446

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

SEC source: 0001209191-17-057871 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,220,571

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $33.74 to $34.42 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-057184 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,231,196

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $33.21 to $33.88 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-056496 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,241,821

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $33.13 to $33.81 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-055169 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,252,446

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $34.00 to $34.32 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information

SEC source: 0001209191-17-055147 · doc4.xml · derivative · entry 2

THOMPSON KEVIN B · CIK 0001180598 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,633

Underlying: Common Stock · 3,633 shares

Expires 2027-09-30

F3 · derivative.exercise_date: 100% of the shares subject to the option will vest upon the earlier of October 1, 2018 or the day prior to the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0001209191-17-055147 · doc4.xml · nonDerivative · entry 1

THOMPSON KEVIN B · CIK 0001180598 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,612

F1 · kind: Represents an initial restricted stock unit ("RSU") award issued pursuant to the Issuer's Outside Director Compensation Policy.

F2 · shares: Each RSU represents a contingent right to receive one share of the Issuer's common stock upon settlement. 100% of the RSUs will vest upon the earlier of October 1, 2018 or the day prior to Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date.

SEC source: 0001209191-17-053995 · doc4.xml · nonDerivative · entry 1

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,263,071

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F2 · price: The sale price represents the weighted average price of the shares sold ranging from $32.93 to $33.32 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

SEC source: 0001209191-17-053168 · doc4.xml · nonDerivative · entry 2

Spanicciati Mario · CIK 0001688128 · Director · Chief Marketing Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · Spanicciati Family 2013 Irrevocable Trust

Disclosed balance after: 3,273,696

F1 · kind: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adapted by the Reporting Person on March 14, 2017.

F3 · price: The sale price represents the weighted average price of the shares sold ranging from $33.71 to $33.84 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.