Document

Slack Technologies, Inc.

San Francisco, California 94105

Securities and Exchange Commission

Division of Corporation Finance

Washington, D.C. 20549

Slack Technologies, Inc.
Acceleration Request for Registration Statement on Form S-1
File No. 333-231041

Pursuant to Rule 461 under the Securities Act of 1933, as amended (the “Act”), Slack Technologies, Inc. (the “Company”) hereby requests that the effective date and time of the above-referenced registration statement (the “Registration Statement”) be accelerated to June 7, 2019, at 4:00 p.m., Eastern Time, or at such later time as the Company or its counsel may orally request via telephone call to the staff of the Division of Corporation Finance of the Securities and Exchange Commission (the “Commission”). In making this acceleration request, the Company acknowledges that it is aware of its responsibilities under the Act. Once the Registration Statement is effective, please orally confirm the event with our counsel, Goodwin Procter LLP, by calling Richard A. Kline at (650) 752-3139. We also respectfully request that a copy of the written order from the Commission verifying the effective time and date of the Registration Statement be sent to our counsel, Goodwin Procter LLP, Attention: Richard A. Kline.

[signature page follows]

If you have any questions regarding this request, please contact Richard A. Kline of Goodwin Procter LLP at (650) 752-3139.

Sincerely,

SLACK TECHNOLOGIES, INC.

/s/ Stewart Butterfield

Stewart Butterfield

Chief Executive Officer



cc:	Allen Shim, Slack Technologies, Inc. David Schellhase, Slack Technologies, Inc. Richard A. Kline, Goodwin Procter LLP David W. Van Horne, Goodwin Procter LLP Sarah B. Axtell, Goodwin Procter LLP Conor Moore, KPMG LLP