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 * Frati Robert 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)
Sr VP Sales, Customer Success
(Last)         (First)         (Middle)
C/O SLACK TECHNOLOGIES, INC., 500 HOWARD STREET
3. Date of Earliest Transaction (MM/DD/YYYY)
5/1/2020
(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  5/1/2020    C    65880  A $0 (1) 386822  D   
Class A Common Stock  5/1/2020    S(2)    33623  D $25.93  353199  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 Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. 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 Date 7. 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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units   (3) 5/1/2020    M        42630    (4) 6/8/2023  Class B Common Stock (1) 42630.0  $0 (3) 0  D   
Class B Common Stock   (1) 5/1/2020    M     42630       (1)  (1) Class A Common Stock  42630.0  $0 (1) 42630  D   
Restricted Stock Units   (3) 5/1/2020    M        5125    (5) 6/20/2025  Class B Common Stock (1) 5125.0  $0 (3) 41000  D   
Class B Common Stock   (1) 5/1/2020    M     5125       (1)  (1) Class A Common Stock  5125.0  $0 (1) 47755  D   
Restricted Stock Units   (3) 5/1/2020    M        2500    (6) 6/20/2025  Class B Common Stock (1) 2500.0  $0 (3) 17500  D   
Class B Common Stock   (1) 5/1/2020    M     2500       (1)  (1) Class A Common Stock  2500.0  $0 (1) 50255  D   
Restricted Stock Units   (3) 5/1/2020    M        15625    (7) 2/26/2026  Class B Common Stock (1) 15625.0  $0 (3) 171875  D   
Class B Common Stock   (1) 5/1/2020    M     15625       (1)  (1) Class A Common Stock  15625.0  $0 (1) 65880  D   
Class B Common Stock   (1) 5/1/2020    C        65880    (1)  (1) Class A Common Stock  65880.0  $0 (1) 0  D   

Explanation of Responses:
(1)  Each share of Class B Common Stock is convertible without payment or consideration into one share of Class A Common Stock at the option of the holder and has no expiration date.
(2)  Shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of Restricted Stock Units (RSUs).
(3)  Each RSU represents the right to receive one share of Class B Common Stock.
(4)  The RSUs are subject to time-based and performance-based vesting criteria. The time-based vesting occurred with respect to 170,520 of the units on May 1, 2017, and the remaining units vest in 12 quarterly installments thereafter, subject to the Reporting Person's continued service with the Issuer on each such date. The performance-based criteria was satisfied upon the Issuer's listing and public trading of its Class A Common Stock on June 20, 2019.
(5)  The RSUs are subject to time-based and performance-based vesting criteria. The time-based vesting occurs in 16 equal quarterly installments commencing on August 1, 2018, subject to the Reporting Person's continued service with the Issuer on each such date. The performance-based criteria was satisfied upon the Issuer's listing and public trading of its Class A Common Stock on June 20, 2019.
(6)  The RSUs are subject to time-based and performance-based vesting criteria. The time-based vesting occurs in 16 equal quarterly installments commencing on May 1, 2018, subject to the Reporting Person's continued service with the Issuer on each such date. The performance-based criteria was satisfied upon the Issuer's listing and public trading of its Class A Common Stock on June 20, 2019.
(7)  The RSUs are subject to time-based and performance-based vesting criteria. The time-based vesting occurs in 16 equal quarterly installments commencing on May 1, 2019, subject to the Reporting Person's continued service with the Issuer on each such date. The performance-based criteria was satisfied upon the Issuer's listing and public trading of its Class A Common Stock on June 20, 2019.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Frati Robert
C/O SLACK TECHNOLOGIES, INC.
500 HOWARD STREET
SAN FRANCISCO,, CA 94105


Sr VP Sales, Customer Success

Signatures
/s/ David Schellhase, as Attorney-in-Fact 5/5/2020
**Signature of Reporting Person Date
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