Statement of Changes in Beneficial Ownership (4)

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 ^* Accel X LP	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)
(Last) (First) (Middle) 500 UNIVERSITY AVENUE	3. Date of Earliest Transaction (MM/DD/YYYY) 12/9/2019
(Street) PALO ALTO, CA 94301 (City) (State) (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	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. 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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	12/9/2019		C		4931850	A	$0.00 ⁽¹⁾	4931850	D ⁽²⁾
Class A Common Stock	12/9/2019		J⁽³⁾		4931850	D	$0.00	0	D ⁽²⁾
Class A Common Stock	12/9/2019		C		370150	A	$0.00 ⁽¹⁾	370150	I	By Accel X Strategic Partners L.P. ⁽⁴⁾
Class A Common Stock	12/9/2019		J⁽⁵⁾		370150	D	$0.00	0	I	By Accel X Strategic Partners L.P. ⁽⁴⁾
Class A Common Stock	12/9/2019		C		198000	A	$0.00 ⁽¹⁾	198000	I	By Accel Investors 2009 L.L.C. ⁽⁶⁾
Class A Common Stock	12/9/2019		J⁽⁷⁾		198000	D	$0.00	0	I	By Accel Investors 2009 L.L.C. ⁽⁶⁾

*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)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)
Class B Common Stock	⁽¹⁾	12/9/2019		C			4931850	⁽¹⁾	⁽¹⁾	Class A Common Stock	4931850	$0.00	37199820	D ⁽²⁾
Class B Common Stock	⁽¹⁾	12/9/2019		C			370150	⁽¹⁾	⁽¹⁾	Class A Common Stock	370150	$0.00	2791990	I	By Accel X Strategic Partners L.P ⁽⁴⁾
Class B Common Stock	⁽¹⁾	12/9/2019		C			198000	⁽¹⁾	⁽¹⁾	Class A Common Stock	198000	$0.00	1493490	I	By Accel Investors 2009 L.L.C ⁽⁶⁾

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 X L.P. Accel X Associates L.L.C. ("Accel X GP") is the general partner of each of Accel X L.P. and Accel X Strategic Partners L.P. (together, the "Accel X Entities"). Accel X GP has sole voting and dispositive power with regard to the shares held by the Accel X Entities. Accel X 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 December 9, 2019, Accel X L.P. distributed, for no consideration, 4,931,850 shares of Class A common stock of the Issuer (the "Accel X Shares") to its limited partners and to Accel X GP, the general partner of Accel X L.P., representing each such partner's pro rata interest in such Accel X Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Shares it received in the distribution by Accel X L.P. to its members, representing each such member's pro rata interest in such Accel X 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 X Strategic Partners L.P. Accel X 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 December 9, 2019, Accel X Strategic Partners L.P. distributed, for no consideration, 370,150 shares of Class A common stock of the Issuer (the "Accel X Strategic Shares") to its limited partners and to Accel X GP, the general partner of Accel X Strategic Partners L.P., representing each such partner's pro rata interest in such Accel X Strategic Shares. On the same date, Accel X GP distributed, for no consideration, the Accel X Strategic Shares it received in the distribution by the Fund to its members, representing each such member's pro rata interest in such Accel X 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 2009 L.L.C.
(7)	On December 9, 2019, Accel Investors 2009 L.L.C. distributed, for no consideration, 198,000 shares of Class A common stock of the Issuer (the "Accel 2009 Shares") to its members, representing each such member's pro rata interest in such Accel 2009 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.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Accel X LP 500 UNIVERSITY AVENUE PALO ALTO, CA 94301		X
ACCEL X STRATEGIC PARTNERS LP 500 UNIVERSITY AVENUE PALO ALTO, CA 94301		X
Accel X Associates L.L.C. 500 UNIVERSITY AVENUE PALO ALTO, CA 94301		X
Accel Investors 2009 L.L.C. 500 UNIVERSITY AVENUE PALO ALTO, CA 94301		X