Leaders Fund Investors 2016 L.L.C. Accel Form 4 Slack / Leaders Fund Investors 2016 L.L.C. Accel ownership change

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

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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 X LP

(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)
06/11/2019

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	06/11/2019		C		1,086,756	A	$0(1)	1,086,756	I	By Accel Leaders Fund L.P.(2)
Class A Common Stock	06/11/2019		C		51,924	A	$0(1)	51,924	I	By Accel Leaders Fund Investors 2016 L.L.C.(3)

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)	06/11/2019		C		1,086,756		(1)	(1)	Class A Common Stock	1,086,756	$0(1)	3,260,269	I	By Accel Leaders Fund L.P.(2)
Class B Common Stock	(1)	06/11/2019		C		51,924		(1)	(1)	Class A Common Stock	51,924	$0(1)	155,772	I	By Accel Leaders Fund Investors 2016 L.L.C.(3)

1. Name and Address of Reporting Person^*

Accel X LP

(Last) (First) (Middle)

500 UNIVERSITY AVENUE

(Street)

PALO ALTO CA 94301

(City) (State) (Zip)

1. Name and Address of Reporting Person^*

Accel Leaders Fund L.P.

(Last) (First) (Middle)

500 UNIVERSITY AVE.

(Street)

PALO ALTO CA 94301

(City) (State) (Zip)

1. Name and Address of Reporting Person^*

Accel Leaders Fund Associates L.L.C.

(Last) (First) (Middle)

500 UNIVERSITY AVE.

(Street)

PALO ALTO CA 94301

(City) (State) (Zip)

1. Name and Address of Reporting Person^*

Accel Leaders Fund Investors 2016 L.L.C.

(Last) (First) (Middle)

500 UNIVERSITY AVE.

(Street)

PALO ALTO CA 94301

(City) (State) (Zip)

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 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.

3. 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.

Remarks:

This Form 4 is the third of three Form 4s filed relating to the same event. Combined, the three reports report the holdings for the following reporting persons (the "Accel Reporting Persons"): Accel X L.P., Accel X Strategic Partners L.P., Accel X Associates L.L.C., Accel Investors 2009 L.L.C., Accel XI L.P., Accel XI Strategic Partners L.P., Accel XI Associates L.L.C., Accel Investors 2013 L.L.C., Accel Growth Fund III L.P., Accel Growth Fund III Strategic Partners L.P., Accel Growth Fund III Associates L.L.C., Accel Growth Fund Investors 2014 L.L.C., Accel Growth Fund IV L.P., Accel Growth Fund IV Strategic Partners L.P., Accel Growth Fund IV Associates L.L.C., Accel Growth Fund Investors 2016 L.L.C., Accel Leaders Fund L.P., Accel Leaders Fund Associates L.L.C. and Accel Leaders Fund Investors 2016 L.L.C. This Form 4 has been split into three filings because there are more than 10 Accel Reporting Persons in total, and the SEC's EDGAR filing system limits a single Form 4 to a maximum of 10 reporting persons. Each Form 4 is filed by designated filer Accel X L.P.

	/s/ TRACY L. SEDLOCK. ATTORNEY IN FACT	06/12/2019
	** Signature of Reporting Person	Date
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