FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Henderson Cal
2. Issuer Name and Ticker or Trading Symbol

Slack Technologies, Inc. [ WORK ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Technology Officer
(Last)          (First)          (Middle)

C/O SLACK TECHNOLOGIES, INC., 500 HOWARD STREET
3. Date of Earliest Transaction (MM/DD/YYYY)

5/19/2020
(Street)

SAN FRANCISCO,, CA 94105
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 5/19/2020  S(1)  1500 D$30 (2)57275 I By trust (3)
Class A Common Stock 5/20/2020  S(1)  1500 D$30.24 55775 I By trust (3)
Class A Common Stock         44972 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person.
(2) The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.00 to $30.01. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
(3) Shares held of record by Cal Henderson and Rebecca Reeve Henderson, spouse of the Reporting Person, Trustees of The Henderson Family Trust u/a/d/ 7/21/2016.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Henderson Cal
C/O SLACK TECHNOLOGIES, INC.
500 HOWARD STREET
SAN FRANCISCO,, CA 94105


Chief Technology Officer

Signatures
/s/ David Schellhase, as Attorney-in-Fact5/21/2020
**Signature of Reporting PersonDate

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