X0306 4 2019-06-07 0 0001764925 Slack Technologies, Inc. WORK 0001715450 Palihapitiya Chamath C/O SOCIAL CAPITAL 120 HAWTHORNE AVENUE PALO ALTO CA 94301 1 0 1 0 Series A Preferred Stock 2019-06-07 4 C 0 266181 0.00 D Class B Common Stock 266181 0 I See Footnotes Series C Preferred Stock 2019-06-07 4 C 0 37897920 0.00 D Class B Common Stock 37897920 0 I See Footnotes Series D Preferred Stock 2019-06-07 4 C 0 5392140 0.00 D Class B Common Stock 5392140 0 I See Footnotes Series E Preferred Stock 2019-06-07 4 C 0 2511300 0.00 D Class B Common Stock 2511300 0 I By:The Social+Capital Partnership Opportunities Fund, L.P. Series F Preferred Stock 2019-06-07 4 C 0 2550628 0.00 D Class B Common Stock 2550628 0 I By:The Social+Capital Partnership Opportunities Fund, L.P. Series G Preferred Stock 2019-06-07 4 C 0 322407 0.00 D Class B Common Stock 322407 0 I See Footnotes Class B Common Stock 2019-06-07 4 J 0 48940576 0.00 A Class A Common Stock 48940576 50853362 I See Footnotes The Series A, Series C, Series D, Series E, Series F, and Series G 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 were converted, in an exempt transaction pursuant to Rule 16b-7, into shares of Class B Common Stock of the Issuer. 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. The shares are held by The Social+Capital Partnership III, L.P. (the "SC III") for itself and as nominee for The Social+Capital Partnership Principals Fund III, L.P. (the "Principals III"). The Social+Capital Partnership GP III, Ltd. (the "GP III Ltd.") is the general partner of The Social+Capital Partnership GP III, L.P. (the "GP III LP"), which is the general partner of SC III. The sole member of GP III Ltd. is Social Capital Holdings Inc. ("SC Holdings"). GP III Ltd. has sole voting and dispositive power with regard to the shares held by SC III. The shares are held by The Social+Capital Partnership II, L.P., (the "SC II") for itself and as nominee for certain other individuals and entities. The Social+Capital Partnership GP II, Ltd.(the "GP II Ltd.") is the general partner of The Social+Capital Partnership GP II, L.P. (the "GP II LP"), which is the general partner of SC II. The sole member of GP II Ltd. is SC Holdings. GP II Ltd. has sole voting and dispositive power with regard to the shares held by SC II. The shares are held by The Social+Capital Partnership Opportunities Fund, L.P., (the "SCP Opportunities Fund"). The Social+Capital Partnership Opportunities Fund GP, Ltd. (the "Opportunities GP Ltd") is the general partner of The Social+Capital Partnership Opportunities Fund GP, L.P. (the "Opportunities GP LP"), which is the general partner of SCP Opportunities Fund. The sole member of Opportunities GP Ltd. is SC Holdings. Opportunities GP Ltd. has sole voting and dispositive power with regard to the shares held by SCP Opportunities Fund. Chamath Palihapitiya is the Chief Executive Officer of SC Holdings and holds voting and dispositive power over shares controlled by GP II Ltd., GP III Ltd., and Opportunities GP Ltd. /s/ Chamath Palihapitiya 2019-06-07