X0508 4 2025-09-30 0001740604 BITGO HOLDINGS, INC. BTGO 0001908561 Belshe Michael C/O BITGO HOLDINGS, INC. 101 S. REID STREET, SUITE 307, PMB# 9793 SIOUX FALLS SD 57103 true true true false CEO, President, CTO 0 Class A Common Stock 2026-01-21 4 F 0 127613 18 D 872387 D Class B Common Stock 2025-09-30 4 J 1 4188 A Class A Common Stock 4188 4188 D Class B Common Stock 2025-09-30 4 J 1 23167 A Class A Common Stock 23167 27355 D Class B Common Stock 2025-09-30 4 J 1 1064405 A Class A Common Stock 1064405 1091760 D Class B Common Stock 2025-09-30 4 J 1 1227310 A Class A Common Stock 1227310 2319070 D Class B Common Stock 2025-09-30 4 J 1 910489 A Class A Common Stock 910489 910489 I By Trust Class B Common Stock 2025-09-30 4 J 1 723589 A Class A Common Stock 723589 723589 I By Trust Class B Common Stock 2025-09-30 4 J 1 910489 A Class A Common Stock 910489 910489 I By Trust Class B Common Stock 2025-09-30 4 J 1 723589 A Class A Common Stock 723589 723589 I By Trust Class B Common Stock 2025-09-30 4 J 1 910489 A Class A Common Stock 910489 910489 I By Trust Class B Common Stock 2025-09-30 4 J 1 723589 A Class A Common Stock 723589 723589 I By Trust Class B Common Stock 2025-09-23 4 J 1 910489 A Class A Common Stock 910489 910489 I By Trust Class B Common Stock 2025-09-30 4 J 1 723589 A Class A Common Stock 723589 723589 I By Trust The transaction represents the number of shares of Class A Common Stock withheld by the Issuer to satisfy tax withholding liabilities in connection with the net settlement of restricted stock units. Each share of Class B Common Stock is convertible into one share of the Issuer's Class A Common Stock at any time, at the election of the holder or automatically upon certain transfers, whether or not for value, or upon the occurrence of certain events or conditions described in the Issuer's Amended and Restated Certificate of Incorporation. The Reporting Person elected to exchange shares of the Issuer's Series B-3 Preferred Stock for shares of the Issuer's Class B Common Stock pursuant to the terms of an Equity Exchange Rights Agreement between the Issuer and the Reporting Person. The Reporting Person elected to exchange shares of the Issuer's Series Seed Preferred Stock for shares of the Issuer's Class B Common Stock pursuant to the terms of an Equity Exchange Rights Agreement between the Issuer and the Reporting Person. The Reporting Person elected to exchange shares of the Issuer's Class F Common Stock for shares of the Issuer's Class B Common Stock pursuant to the terms of an Equity Exchange Rights Agreement between the Issuer and the Reporting Person. The Reporting Person elected to exchange shares of the Issuer's Common Stock for shares of the Issuer's Class B Common Stock pursuant to the terms of an Equity Exchange Rights Agreement between the Issuer and the Reporting Person. These shares are held by The AB Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The AB Non-Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The CB Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The CB Non-Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The CW Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The CW Non-Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The ZW Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. These shares are held by The ZW Non-Grantor GST Exempt Trust under The Belshe/Xu Family 2021 Irrevocable Trust, of which the Reporting Person is Trustee. /s/ Edward Reginelli, Attorney-in-Fact 2026-01-23