Company: BL
Filing Date: 2025-02-21
Form Type: S-8
Source: 0001193125-25-032083
Chunk: 1

Company: BLACKLINE, INC.
Filing Date: 2025-02-21
Form: S-8
Chunk 1
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|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE This Registration Statement on Form S-8(the “ Registration Statement”) registers additional shares of common stock of BlackLine, Inc. (the “ Registrant”) reserved for issuance under the Registrant’s 2016 Equity Incentive Plan (the “ 2016 Plan”). The number of shares of the Registrant’s common stock available for grant and issuance under the 2016 Plan is subject to an annual increase on the first day of each fiscal year starting on January 1, 2017, by an amount equal to the least of (i) 6,196,000 shares, (ii) five percent (5%) of the outstanding shares of the Registrant’s common stock on the last day of the immediately preceding fiscal year or (iii) a lower number of shares of common stock determined by the Registrant’s board of directors or a committee thereof. This Registration Statement registers an aggregate of 3,140,667 shares of the Registrant’s common stock available for grant and issuance under the 2016 Plan, all of which became available for grant and issuance under the 2016 Plan on January 1, 2025. PART I INFORMATION REQUIRED IN THE PROSPECTUS The information specified in Item 1 and Item 2 of Part I of Form S-8is omitted from this Registration Statement in accordance with the provisions of Rule 428 under the Securities Act of 1933, as amended (the “ Securities Act”), and the introductory note to Part I of Form S-8.The documents containing the information specified in Part I of Form S-8will be delivered to the participants in the equity benefit plans covered by this Registration Statement as specified by Rule 428(b)(1) under the Securities Act. PART II INFORMATION REQUIRED IN REGISTRATION STATEMENT

| Item 3. | Incorporation of Documents by Reference. |

The Registrant hereby incorporates by reference into this Registration Statement the following documents previously filed with the Securities and Exchange Commission (the “ Commission”): (1) The Registrant’s Annual Report on Form 10-Kfor the fiscal year ended December 31, 2024, filed with