Sec Form 3 Filing - Braccia Andrew @ Slack Technologies, Inc. - 2019-06-07

FORM 3 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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Braccia Andrew 2. Issuer Name and Ticker or Trading Symbol Slack Technologies, Inc. [ WORK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SLACK TECHNOLOGIES, INC., 500 HOWARD STREET 3. Date of Earliest Transaction (MM/DD/YY) 06/07/2019 (Street) SAN FRANCISCO, CA94105 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 Series G Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 4,080,388 I By Accel Growth Fund IV L.P. ( 3 ) Series G Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 23,213 I By Accel Growth Fund IV Strategic Partners L.P. ( 4 ) Series G Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 195,164 I By Accel Growth Fund Investors 2016 L.L.C. ( 5 ) Series G Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 2,743,706 I By Accel Leaders Fund L.P. ( 6 ) Series G Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 131,091 I By Accel Leaders Fund Investors 2016 L.L.C. ( 7 ) Series H Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 797,292 I By Accel Growth Fund IV L.P. ( 3 ) Series H Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 4,536 I By Accel Growth Fund IV Strategic Partners L.P. ( 4 ) Series H Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 38,134 I By Accel Growth Fund Investors 2016 L.L.C. ( 5 ) Series H Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 1,603,319 I By Accel Leaders Fund L.P. ( 6 ) Series H Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 76,605 I By Accel Leaders Fund Investors 2016 L.L.C. ( 7 ) Series H-1 Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 1,422,056 I By Accel XI L.P. ( 8 ) Series H-1 Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 106,843 I By Accel XI Strategic Partners L.P. ( 9 ) Series H-1 Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class B Common Stock ( 2 ) 151,025 I By Accel Investors 2013 L.L.C. ( 10 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Braccia Andrew C/O SLACK TECHNOLOGIES, INC. 500 HOWARD STREET SAN FRANCISCO, CA94105 X X Signatures /s/ David Schellhase, as Attorney-in-Fact 06/07/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Series A, Series B, Series C, Series D, Series E, Series F-1, Series G, Series H and Series H-1 Preferred Stock are each convertible into Class B Common Stock on a 1:1 basis and have no expiration date. Upon the effectiveness of the Issuer's Registration Statement on Form S-1, all shares of preferred stock will be converted, in an exempt transaction pursuant to Rule 16b-7, into shares of Class B Common Stock of the Issuer. ( 2 )Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the Reporting Person and has no expiration date. ( 3 )These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (the "Accel Growth Fund IV Entities"). The managing members of Accel Growth Fund IV Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan Sweeney, and Richard P. Wong. Accel Growth Fund IV Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities, and its managing members share such powers. ( 4 )These shares are held by Accel Growth Fund IV Strategic Partners L.P. Accel Growth Fund IV Associates L.L.C. is the general partner of each of the Accel Growth Fund IV Entities. The managing members of Accel Growth Fund IV Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan Sweeney, and Richard P. Wong. Accel Growth Fund IV Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities, and its managing members share such powers. ( 5 )These shares are held by Accel Growth Fund Investors 2016 L.L.C. The managing member of Accel Growth Fund Investors 2016 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan Sweeney, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Growth Fund Investors 2016 L.L.C. ( 6 )These shares are held by Accel Leaders Fund L.P. Accel Leaders Fund Associates L.L.C. is the general partner of Accel Leaders Fund L.P. The managing members of Accel Leaders Fund Associates L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan Sweeney, and Richard P. Wong. Accel Leaders Fund Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel Leaders Fund L.P, and its managing members share such powers. ( 7 )These shares are held by Accel Leaders Fund Investors 2016 L.L.C. The managing members of Accel Leaders Fund Investors 2016 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, Ryan Sweeney, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Leaders Fund Investors 2016 L.L.C. ( 8 )These shares are held by Accel XI LP. Accel X Associates L.L.C. is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the "Accel X Entities"). The managing members of Accel X Associates L.L.C. are Andrew Braccia, Kevin Efrusy, Sameer Gandhi, Ping Li, Tracy Sedlock, and Richard P. Wong. Accel X Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel XI Associates L.L.C. is the general partner each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the "Accel XI Entities"). The managing members of Accel XI Associates L.L.C. are Andrew Braccia, Sameer Gandhi, Ping Li, Tracy Sedlock, and Richard Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities. ( 9 )These shares are held by Accel XI Strategic Partners L.P. Accel X Associates L.L.C. is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the "Accel X Entities"). The managing members of Accel X Associates L.L.C. are Andrew Braccia, Kevin Efrusy, Sameer Gandhi, Ping Li, Tracy Sedlock, and Richard P. Wong. Accel X Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel XI Associates L.L.C. is the general partner each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the "Accel XI Entities"). The managing members of Accel XI Associates L.L.C. are Andrew Braccia, Sameer Gandhi, Ping Li, Tracy Sedlock, and Richard Wong. Accel XI Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel XI Entities. ( 10 )These shares are held by Accel Investors 2013 L.L.C. The managing members of Accel Investors 2013 L.L.C. are Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong, all of whom share voting and dispositive power with regard to the shares held by Accel Investors 2013 L.L.C.

Remarks: This Form 3 is the second of two Form 3s filed relating to the same event. This Form 3 has been split into two filings because there are more than 30 reportable holdings.Exhibit 24.1 Power of Attorney

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