Form of Class A common stock certificate of the Registrant

. ZQCERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS# Class A Common Stock Class A Common Stock PO BOX 43004, Providence, RI ###-###-#### ADD 4 ADD 3 ADD 2 ADD 1 DESIGNATION (IF ANY) MR ASAMPLE PAR VALUE $0.0001 Certificate Shares Number **000000****************** ***000000***************** ZQ00000000 ****000000**************** *****000000*************** SLACK TECHNOLOGIES, INC. ******000000************** INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE ** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample SEE REVERSE FOR CERTAIN DEFINITIONS **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David THIS CERTIFIES THAT Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David SampleMR. **** Mr. Alexander SAMPLE David Sample **** Mr. Alexander & David MRS. Sample **** Mr. Alexander SAMPLE David Sample **** Mr. Alexander & David Sample **** CUSIP 83088V 10 2 Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. AlexanderMR. David SampleSAMPLE **** Mr. Alexander David Sample& MRS.**** Mr. Alexander DavidSAMPLE Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares*** is the owner of *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares**** 000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0 THIS CERTIFICATE IS TRANSFERABLE IN 00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00 0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000***ZERO HUNDRED THOUSAND000**Shares****000 CITIES DESIGNATED BY THE TRANSFER 000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000 00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000 AGENT, AVAILABLE ONLINE AT 0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000ZERO HUNDRED AND ZERO*****Shares****000000 www.computershare.com **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000* *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000** Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S FULLY-PAID AND NON-ASSESSABLE SHARES OF CLASS A COMMON STOCK OF DTC Number of Shares Insurance Value Holder ID CUSIP/IDENTIFIER Slack Technologies, Inc. (hereinafter called the “Company”), transferable on the books of the Company in Total Transaction ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### ###-###-#### Certificate Numbers person or by duly authorized attorney, upon surrender of this Certificate properly endorsed. This Certificate and the shares represented hereby, are issued and shall be held subject to all of the provisions of the Certificate of Incorporation, as amended, and the Bylaws, as amended, of the Company (copies of which are on file with the Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. Witness the facsimile seal of the Company and the facsimile signatures of its duly authorized officers. 12345678 123456789012345 Num/No. DATED DD-MMM-YYYY 6 5 4 3 2 1 NOL FACSIMILE SIGNATURE TO COME CH OG COUNTERSIGNED AND REGISTERED: E IE T RPORA S O TE COMPUTERSHARE TRUST COMPANY, N.A. K C , I C N Denom. President TRANSFER AGENT AND REGISTRAR, A C XXXXXXXXXX XXXXXX XX X L . 1,000,000.00 S 6 5 4 3 2 1 February 25, 2009 123456 D Total FACSIMILE SIGNATURE TO COME ELAWARE 7 6 5 4 3 2 1 By Secretary AUTHORIZED SIGNATURE