Company: BL
Filing Date: 2025-03-27
Form Type: DEF 14A
Source: 0001666134-25-000011
Chunk: 1

Company: BLACKLINE, INC.
Filing Date: 2025-03-27
Form: DEF 14A
Chunk 1
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 the annual meeting are more fully described in the accompanying notice of annual meeting of stockholders and proxy statement.

Your vote is important. Regardless of whether you plan to attend the virtual annual meeting, it is important that your shares be represented and voted at the annual meeting, and we hope you will vote as soon as possible. You may vote by proxy online or by telephone, or if you received paper copies of the proxy materials by mail, you may also vote by mail by following the instructions on the proxy card or voting instruction card. Voting by one of these methods will ensure your representation at the annual meeting regardless of whether you attend the virtual annual meeting.

Thank you for your ongoing support of, and continued interest in, BlackLine, Inc.

Sincerely,

| Owen Ryan                     |     |                            |     | Therese Tucker |
| Chair of the Board and Co-CEO |     |                            |     | Co-CEO         |
|                               |     | Woodland Hills, California |     |                |
|                               |     | March 27, 2025             |     |                |

TABLE OF CONTENTS

#### BLACKLINE, INC.

#### 21300 Victory Boulevard, 12th Floor

#### Woodland Hills, California 91367
<div align='center'>NOTICE OF ANNUAL MEETING OF STOCKHOLDERS</div>

| Time and Date                   
 Place                           |     | 9:00 a.m. Pacific time, on Thursday, May 8, 2025.                                                                                                                                                                                                                                                                                                                                                                                                                         
 The annual meeting will be a virtual meeting held online. You will be able to attend the annual meeting, vote your shares electronically, and submit your questions during the live webcast of the meeting by visiting www.virtualshareholdermeeting.com/BL2025 and entering the sixteen-digit control number located on your Notice of Internet Availability or, if you received a printed copy of the proxy materials, on your proxy card or voting instruction card.   |
|:--------------------------------|:----|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Items of Business               |     | (1)  To elect as Class III directors the four nominees named in the accompanying proxy statement to serve until our 2028 annual meeting of stockholders and until their respective successors are duly elected and qualified.                                                                                                                                                                                                                                             |
|                                 |     | (2)  To ratify the appointment of PricewaterhouseCoopers LLP (“PwC) as our independent registered public accounting firm for the fiscal year ending December 31,