SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Accel XI L.P. (Last) (First) (Middle) 500 UNIVERSITY AVENUE (Street) PALO ALTO CA 94301 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Slack Technologies, Inc. [ WORK ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 06/12/2020
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X 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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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
Class A Common Stock	06/12/2020		C		7,318,664	A	$0.00(1)	7,318,664	D(2)
Class A Common Stock	06/12/2020		J(3)		7,318,664	D	$0.00	0	D(2)
Class A Common Stock	06/12/2020		C		549,880	A	$0.00(1)	549,880	I	By Accel XI Strategic Partners L.P.(4)
Class A Common Stock	06/12/2020		J(5)		549,880	D	$0.00	0	I	By Accel XI Strategic Partners L.P.(4)
Class A Common Stock	06/12/2020		C		777,244	A	$0.00(1)	777,244	I	By Accel Investors 2013 L.L.C.(6)
Class A Common Stock	06/12/2020		J(7)		777,244	D	$0.00	0	I	By Accel Investors 2013 L.L.C.(6)

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		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: 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
Class B Common Stock	(1)	06/12/2020		C			7,318,664	(1)	(1)	Class A Common Stock	7,318,664	$0.00	0	D(2)
Class B Common Stock	(1)	06/12/2020		C			549,880	(1)	(1)	Class A Common Stock	549,880	$0.00	0	I	By Accel XI Strategic Partners L.P.(4)
Class B Common Stock	(1)	06/12/2020		C			777,244	(1)	(1)	Class A Common Stock	777,244	$0.00	0	I	By Accel Investors 2013 L.L.C.(6)

1. Name and Address of Reporting Person* Accel XI L.P. (Last) (First) (Middle) 500 UNIVERSITY AVENUE (Street) PALO ALTO CA 94301 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Accel XI Strategic Partners L.P. (Last) (First) (Middle) 500 UNIVERSITY AVENUE (Street) PALO ALTO CA 94301 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Accel XI Associates L.L.C. (Last) (First) (Middle) 500 UNIVERSITY AVENUE (Street) PALO ALTO CA 94301 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Accel Investors 2013 L.L.C. (Last) (First) (Middle) 500 UNIVERSITY AVENUE (Street) PALO ALTO CA 94301 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

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. These shares are held by Accel XI L.P. Accel XI Associates L.L.C. ("Accel XI GP") is the general partner of each of Accel XI L.P. and Accel XI Strategic Partners L.P. (together, the "Accel XI Entities"). Accel XI GP has sole voting and dispositive power with regard to the shares held by the Accel XI Entities. Accel XI GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

3. On June 12, 2020, Accel XI L.P. distributed, for no consideration, 7,318,664 shares of Class A common stock of the Issuer (the "Accel XI Shares") to its limited partners and to Accel XI GP, the general partner of Accel XI L.P., representing each such partner's pro rata interest in such Accel XI Shares. On the same date, Accel XI GP distributed, for no consideration, the Accel XI Shares it received in the distribution by Accel XI L.P. to its members, representing each such member's pro rata interest in such Accel XI Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

4. These shares are held by Accel XI Strategic Partners L.P. Accel XI GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

5. On June 12, 2020, Accel XI Strategic Partners L.P. distributed, for no consideration, 549,880 shares of Class A common stock of the Issuer (the "Accel XI Strategic Shares") to its limited partners and to Accel XI GP, the general partner of Accel XI Strategic Partners L.P., representing each such partner's pro rata interest in such Accel XI Strategic Shares. On the same date, Accel XI GP distributed, for no consideration, the Accel XI Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel XI Strategic Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

6. These shares are held by Accel Investors 2013 L.L.C.

7. On June 12, 2020, Accel Investors 2013 L.L.C. distributed, for no consideration, 777,244 shares of Class A common stock of the Issuer (the "Accel 2013 Shares") to its members, representing each such member's pro rata interest in such Accel 2013 Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

Remarks:

	/s/ TRACY L. SEDLOCK, ATTORNEY IN FACT	06/16/2020
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.