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 *

Shim Allen		 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 Financial Officer
(Last)          (First)          (Middle)

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

7/1/2021
(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 7/1/2021  S(1)  1925 D$44.29 234894 (2)D  
Class A Common Stock         151468 I By LLC (3)
Class A Common Stock         0 (2)(4)I By Allen Shim, trustee of the Allen Shim 2019 Grantor Retained Annuity Trust dated May 1, 2019 
Class A Common Stock         1360805 (5)I By The Shim-Park Family Revocable Trust 
Class A Common Stock         43176 (4)I By The Shim Park 2019 Irrevocable Trust 

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) Shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of Restricted Stock Units (RSUs).
(2) Reflects 33,132 shares of Class A common stock distributed by the Allen Shim 2019 Grantor Retained Annuity Trust dated May 1, 2019 to the Reporting Person on June 1, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.
(3) These shares are held of record by a LLC of which the Reporting Person is the manager. A family trust, for which the Reporting Person is investment advisor, is the sole member of the LLC.
(4) Reflects 43,176 shares of Class A common stock distributed by the Allen Shim 2019 Grantor Retained Annuity Trust dated May 1, 2019 to the Shim Park 2019 Irrevocable Trust on June 1, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.
(5) Reflects 168,300 shares of Class A common stock donated by the Shim-Park Family Revocable Trust to a donor advised fund on June 18, 2021 for no consideration, in accordance with the exemption afforded by Rule 16b-5 of the Securities Exchange Act of 1934, as amended.
Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Shim Allen
C/O SLACK TECHNOLOGIES, INC.
500 HOWARD STREET
SAN FRANCISCO,, CA 94105

Chief Financial Officer
Signatures
/s/ David Schellhase, as Attorney-in-Fact7/6/2021
**Signature of Reporting PersonDate
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