Trust is in the Balance

Proxy

2018 ANNUAL MEETING OF STOCKHOLDERS

Annual Meeting of Stockholders
Proxy Materials

The annual meeting of stockholders of BlackLine, Inc. will be held on May 9, 2018 at 9:00 a.m. Pacific Time.

The annual meeting will be a virtual meeting held over the Internet. You will be able to attend the virtual annual meeting, vote your shares electronically and submit your questions during the live webcast of the meeting by visiting www.virtualshareholdermeeting.com/BL2018 and entering your sixteen-digit control number located on your proxy card.

Stockholders who held shares of our common stock, $.01 par value, as of close of business on March 12, 2018, the record date, will be entitled to vote their shares at the annual meeting of stockholders.

Proxy Materials for the 2018 Annual Meeting of Stockholders:

Download Documentation Notice of 2018 Annual Meeting of Stockholders and Proxy Statement

Download Documentation Sample Proxy Card

Download Documentation 2017 Annual Report

VOTE Your Proxy

Stockholders of Record:

You are a "stockholder of record" if on the record date you held your shares in your own name with our transfer agent, American Stock Transfer & Trust Company, LLC.

You should have received from Broadridge Financial Solutions, Inc. a Notice of Availability of Proxy Materials. Stockholders of record can vote online, by telephone, or by mailing in the proxy cards.

Online: To access your online proxy card, please visit www.proxyvote.com and follow the on-screen instructions. You may enter your voting instructions at www.proxyvote.com until 11:59 PM EST on May 8, 2018.

Telephone: Call toll-free 1-800-690-6903 from any touch-tone telephone and follow the instructions. Have your proxy card available when you call. Telephone voting is available 24 hours a day, 7 days a week, until 11:59 PM EST on May 8, 2018.

Mail: You may request a card by following the instructions above.


Beneficial Stockholders:

You are a "beneficial stockholder" if on the record date you held your shares through a broker, bank or other nominee. Beneficial stockholders are also referred to as owning their shares in "street name."

You should have received from your broker, bank or other nominee a Notice of Availability of Proxy Materials.

In order to vote your shares, you will need the control number(s) printed on the Notice(s) of Availability of Proxy Materials you received.

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