X0206 3 2020-10-20 0 0001724570 DATTO HOLDING CORP. MSP 0001216495 VEP Group, LLC C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001576947 Vista Foundation Fund II, L.P. C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001828725 VISTA FOUNDATION FUND II GP, LLC C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001576936 Vista Foundation Fund II-A, L.P. C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001828733 VFF II GP (CAYMAN), L.P. C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001828731 VFF II GP (CAYMAN), LTD. C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001576974 VFF II FAF, L.P. C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001589964 Vista Foundation Fund II Executive, L.P. C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001589968 Vista Foundation Associates II, LLC C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 0001735621 Merritt VI Aggregator, LLC C/O VISTA EQUITY PARTNERS 4 EMBARCADERO CENTER, 20TH FL. SAN FRANCISCO CA 94111 0 0 1 0 Common stock, $0.001 par value 113753615 I See Footnote Includes 13,941,912 shares held directly by Vista Foundation Fund II, L.P. ("VFF II"), 3,175,352 shares held directly by Vista Foundation Fund II-A, L.P. ("VFF II-A"), 846,946 shares held directly by VFF II FAF, L.P. ("VFF II FAF"), 208,600 shares held directly by Vista Foundation Fund II Executive, L.P. ("VFF II Executive"), 27,193 shares held directly by Vista Foundation Associates II, LLC ("VF Associates II") and 95,553,611 shares held directly by Merritt VI Aggregator, LLC ("Merritt VI," and collectively with VFF II, VFF II-A, VFF II FAF, VFF II Executive and VF Associates II, the "Vista Funds"). Vista Foundation Fund II GP, LLC ("VFF II GP") is the general partner of each of VFF II, VFF II FAF and VFF II Executive. VEP Group, LLC ("VEP Group") is the Senior Managing Member of VFF II GP and VF Associates II. VFF II GP (Cayman), L.P. ("VFF II-A GP") is the general partner of VFF II-A. VFF II GP (Cayman), Ltd. ("VFF II-A UGP") is the general partner of VFF II-A GP. Vista Equity Partners Fund VI, L.P. ("VEPF VI") is the managing member of Merritt VI. Vista Equity Partners Fund VI GP, L.P. ("Fund VI GP") is the sole general partner of VEPF VI. VEPF VI GP, Ltd. ("Fund VI UGP") is the general partner of Fund VI GP. Robert F. Smith is the sole director and one of 11 members of each of VFF II-A UGP and Fund VI UGP. Robert F. Smith is the sole Managing Member of VEP Group. (Continued from footnote 2) Consequently, Mr. Smith, VFF II GP, VFF II-A GP, VFF II-A UGP, VEPF VI, Fund VI GP, Fund VI UGP and VEP Group may be deemed the beneficial owners of the shares held by the Vista Funds. Each of the Vista Funds, Mr. Smith, VFF II GP, VFF II-A GP, VFF II-A UGP, VEPF VI, Fund VI GP, Fund VI UGP and VEP Group expressly disclaim beneficial ownership of any shares not held directly, except to the extent of its or his pecuniary interest. Exhibit 24 - Power of Attorney. This report is filed as form 1 of 2 to report related transactions for the following filers: Vista Foundation Fund II, L.P., Vista Foundation Fund II-A, L.P., VFF II FAF, L.P., Vista Foundation Fund II Executive, L.P., Vista Foundation Associates II, LLC, Merritt VI Aggregator, LLC, Vista Foundation Fund II GP, LLC, VEP Group, LLC, VFF II GP (Cayman), L.P., VFF II GP (Cayman), Ltd., Vista Equity Partners Fund VI, L.P., Vista Equity Partners Fund VI GP, L.P., VEPF VI GP, Ltd. and Robert F. Smith. /s/ Robert F. Smith, Managing Member of the Senior Managing Member of the General Partner of Vista Foundation Fund II, L.P. 2020-10-20 /s/ Robert F. Smith, Managing Member of the Senior Managing Member of Vista Foundation Fund II GP, LLC 2020-10-20 /s/ Robert F. Smith, Managing Member of the VEP Group, LLC 2020-10-20 /s/ Robert F. Smith, sole director and member of the General Partner of the General Partner of Vista Foundation Fund II-A, L.P. 2020-10-20 /s/ Robert F. Smith, sole director and member of the General Partner of VEP II GP (Cayman), L.P, 2020-10-20 /s/ Robert F. Smith, sole director and member of VP II GP (Cayman), Ltd. 2020-10-20 /s/ Robert F. Smith, Managing Member of the Senior Managing Member of the General Partner of VFF II FAF, L.P. 2020-10-20 /s/ Robert F. Smith, Managing Member of the Senior Managing Member of the General Partner of Vista Foundation Fund II Executive, L.P. 2020-10-20 /s/ Robert F. Smith, Managing Member of the Senior Managing Member of Vista Foundation Associates II, L.P. 2020-10-20 /s/ Robert F. Smith, sole director and member of the General Partner of the General Partner of the Managing Member of Merritt VI Aggregator, LLC 2020-10-20