William Severance - 23 Jun 2022 Form 4 Insider Report for DATTO HOLDING CORP.

Footnote F1

Represents 505 shares acquired under the Issuer's 2021 Employee Stock Purchase Plan.

Footnote F2

Pursuant to the Agreement and Plan of Merger, dated April 11, 2022, by and among Knockout Parent Inc., Knockout Merger Sub Inc., the Issuer, and, for certain limited purposes set forth in the Merger Agreement, Kaseya Holdings Inc. and Kaseya Inc. (the "Merger Agreement"), each share of the Issuer's common stock ("Common Stock") was canceled and converted into the right to receive $35.50 per share in cash without interest, subject to required withholding taxes.

Footnote F3

Pursuant to the Merger Agreement, as of June 23, 2022 (the "Effective Time"), each restricted stock unit of the Issuer (an "RSU") that is unexpired, unexercised, outstanding and vested as of immediately prior to the Effective Time or that vested in accordance with its terms as a result of the consummation of the merger and other transactions contemplated by the Merger Agreement (a "Vested RSU") was canceled and converted into the right to receive an amount in cash equal to the product of (i) $35.50 and (ii) the total number of shares of Common Stock subject to such Vested RSUs as of immediately prior to the Effective Time.

Footnote F4

Pursuant to the Merger Agreement, RSUs that were outstanding as of immediately prior to the Effective Time that were not Vested RSUs ("Unvested RSUs") were, at the Effective Time, canceled and converted into the right to receive an amount in cash equal to the product of (i) $35.50 and (ii) the total number of shares of Common Stock subject to such Unvested RSUs (the "Cash Replacement RSU Amounts"), which Cash Replacement RSU Amounts will be paid at the same time that the Unvested RSUs would have vested pursuant to their terms.

Footnote F5

Consists of RSUs, of which 25% will vest on June 30, 2022, and an additional 6.25% will vest quarterly thereafter so long as the Reporting Person continues to be employed as of each respective vesting date. At the Effective Time, the 18,900 Unvested RSUs were canceled and converted into the right to receive a cash payment which represents $35.50 for each outstanding Unvested RSU, which will vest and be payable at the same time as the Unvested RSUs for which such cash amount was exchanged.

Footnote F6

Pursuant to the Merger Agreement, each option to purchase Issuer common stock (an "Option") that was unexpired, unexercised, outstanding and vested as of immediately prior to June 23, 2022 (the "Effective Time") or that vested in accordance with its terms as a result of the consummation of the Merger and the other transactions contemplated by the Merger Agreement (a "Vested Option"), was, at the Effective Time, canceled and converted into the right to receive an amount in cash equal to the product of (i) the number of shares of Common Stock subject to such Vested Option as of immediately prior to the Effective Time and (ii) the excess, if any, of $35.50 over the per share exercise price of such Vested Option.

Footnote F7

At the Effective Time, the 21,875 Options were canceled in exchange for a cash payment representing the difference between $35.50 and the exercise price of the option per share.