Cal Henderson - 21 Jul 2021 Form 4 Insider Report for Slack Technologies, Inc.

Footnote F1

Upon consummation of the exchange offer (as described below), each share of tendered Class B common stock, par value $0.0001 per share, converted on a one-to-one basis into Class A common stock, par value $0.0001 per share.

Footnote F2

Shares held of record by Cal Henderson and Rebecca Reeve Henderson, Trustees of The Henderson Family Trust u/a/d/ 7/21/2016.

Footnote F3

Shares held of record by First Republic Trust Company of Delaware LLC and Cal Henderson, Trustees of The Theodore Henderson GST Exempt Trust under the Cal Henderson Family 2019 Irrevocable Trust dated May 22, 2019.

Footnote F4

Shares held of record by First Republic Trust Company of Delaware LLC and Cal Henderson, Trustees of The William Franklin Henderson GST Exempt Trust under the Cal Henderson Family 2019 Irrevocable Trust dated May 22, 2019.

Footnote F5

Shares held of record by First Republic Trust Company of Delaware LLC and Rebecca Reeve Henderson, Trustees of The Theodore Henderson GST Exempt Trust under the Rebecca Reeve Henderson Family 2019 Irrevocable Trust dated May 22, 2019.

Footnote F6

Shares held of record by First Republic Trust Company of Delaware LLC and Rebecca Reeve Henderson, Trustees of The William Franklin Henderson GST Exempt Trust under the Rebecca Reeve Henderson Family 2019 Irrevocable Trust dated May 22, 2019.

Footnote F7

Shares held of record by Rebecca Reeve Henderson, spouse of the Reporting Person, and as such, may be deemed to be beneficially held by the Reporting Person.

Footnote F8

Shares held of record by First Republic Trust Company of Delaware LLC and Cal Henderson, Trustees of The Cal Henderson 2019 Siblings Irrevocable Trust dated May 22, 2019.

Footnote F9

Shares held of record by First Republic Trust Company of Delaware LLC and Cal Henderson, Trustees of The Cal Henderson 2019 Parents Irrevocable Trust dated May 22, 2019.

Footnote F10

Shares held of record by First Republic Trust Company of Delaware LLC and Rebecca Reeve Henderson, Trustees of The Rebecca Reeve Henderson 2019 Siblings Irrevocable Trust dated May 22, 2019.

Footnote F11

Shares held of record by First Republic Trust Company of Delaware LLC and Rebecca Reeve Henderson, Trustees of The Rebecca Reeve Henderson 2019 Parents Irrevocable Trust dated May 22, 2019.

Footnote F12

Pursuant to the Agreement and Plan of Merger, dated as of December 1, 2020 (the "Merger Agreement"), by and among salesforce.com, inc. ("Salesforce"), Skyline Strategies I Inc., Skyline Strategies II LLC, and the Issuer, each share of the Issuer's common stock was tendered in exchange for (i) 0.0776 shares of Salesforce common stock and (ii) $26.79 in cash, together with cash in lieu of any fractional shares of Salesforce common stock.

Footnote F13

Includes 30,919 shares of Class A common stock subject to restricted stock units ("RSUs") of the Issuer. Pursuant to the Merger Agreement, at the effective time of the merger (the "Effective Time"), each of the Issuer's RSUs were assumed and converted into an RSU with respect to a number of shares of Salesforce common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of common stock subject to the Issuer RSU immediately prior to the Effective Time by (ii) the "option/RSU conversion ratio" as defined in the definitive proxy statement filed by the Issuer with the SEC on January 29, 2021. The converted RSU will otherwise be subject to the same terms and conditions as were applicable to the Issuer RSU prior to the Effective Time.

Footnote F14

Reflects 26,588 shares of Class A common stock distributed by The Rebecca Reeve Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019 to Rebecca Reeve Henderson on July 7, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

Footnote F15

Reflects 33,706 shares of Class A common stock distributed by The Cal Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019 to The Cal Henderson 2019 Siblings Irrevocable Trust on July 7, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

Footnote F16

Reflects 8,427 shares of Class A common stock distributed by The Cal Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019 to The Cal Henderson 2019 Parents Irrevocable Trust on July 7, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

Footnote F17

Reflects 29,493 shares of Class A common stock distributed by The Rebecca Reeve Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019 to The Rebecca Reeve Henderson 2019 Siblings Irrevocable Trust on July 7, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

Footnote F18

Reflects 12,640 shares of Class A common stock distributed by The Rebecca Reeve Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019 to The Rebecca Reeve Henderson 2019 Parents Irrevocable Trust on July 7, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

Footnote F19

Reflects 26,588 shares of Class A common stock distributed by The Cal Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019 to the Reporting Person on July 7, 2021, for no consideration, resulting in a change of form of beneficial ownership in accordance with the exemption afforded by Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

Footnote F20

Shares held of record by Cal Henderson, Trustee of The Cal Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019.

Footnote F21

Shares held of record by Rebecca Reeve Henderson, Trustee of The Rebecca Reeve Henderson 2019 Grantor Retained Annuity Trust dated May 22, 2019.

Footnote F22

This RSU represents the right to receive shares of Class B common stock.

Footnote F23

Pursuant to the Merger Agreement, at the Effective Time, each of the Issuer's RSUs were assumed and converted into an RSU with respect to a number of shares of Salesforce common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of common stock subject to the Issuer RSU immediately prior to the Effective Time by (ii) the option/RSU conversion ratio. The converted RSU will otherwise be subject to the same terms and conditions as were applicable to the Issuer RSU prior to the Effective Time.

Footnote F24

Not applicable.

Footnote F25

Pursuant to the Merger Agreement, at the Effective Time, each outstanding option was assumed and converted into an option to purchase the number of shares of Salesforce common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of common stock subject to the Issuer option immediately prior to the Effective Time by (ii) the option/RSU conversion ratio, with an exercise price determined by dividing (i) the exercise price of the Issuer option immediately prior to the Effective Time by (ii) the option/RSU conversion ratio. The converted option will otherwise be subject to the same terms and conditions as were applicable to the Issuer option prior to the Effective Time.