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These shares were sold as part of block trades for multiple security holders of the Issuer at prices ranging from $4.96 to $5.07, inclusive. The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein with regard to the block trades."}],"balance_after":582398,"source":{"system":"sec-edgar","filing":"0002084812-26-000015","document":"form4-08112026_060803.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000015/form4-08112026_060803.xml","form_type":"4"}},{"id":702032,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-07-28T23:10:33.000Z","date":"2026-07-24","kind":"sale","planned":false,"acquired":false,"shares":9021,"price":4.8887,"value":44100.9627,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of restricted stock units. The sales were to satisfy tax withholding obligations to be funded by a \"sell to cover\" transaction."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in this line item is a weighted average price. These shares were sold as part of block trades for multiple security holders of the Issuer at prices ranging from $4.78 to $5.04, inclusive. The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein with regard to the block trades."}],"balance_after":582489,"source":{"system":"sec-edgar","filing":"0002084812-26-000013","document":"form4-07282026_110729.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000013/form4-07282026_110729.xml","form_type":"4"}},{"id":711004,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-07-10T22:14:45.000Z","date":"2026-07-08","kind":"sale","planned":false,"acquired":false,"shares":94,"price":4.9737,"value":467.5278,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sales were to satisfy tax withholding obligations to be funded by a \"sell to cover\" transaction."}],"balance_after":591510,"source":{"system":"sec-edgar","filing":"0002084812-26-000011","document":"form4-07102026_100741.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000011/form4-07102026_100741.xml","form_type":"4"}},{"id":711003,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-07-10T22:14:45.000Z","date":"2026-06-11","kind":"sale","planned":false,"acquired":false,"shares":91,"price":5.1189,"value":465.8199,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sales were to satisfy tax withholding obligations to be funded by a \"sell to cover\" transaction."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in this line item is a weighted average price. These shares were sold as part of block trades for multiple security holders of the Issuer at prices ranging from $5.02 to $5.19, inclusive. The Reporting Person undertakes to provide to the Issuer, any securityholder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein with regard to the block trades."}],"balance_after":591604,"source":{"system":"sec-edgar","filing":"0002084812-26-000011","document":"form4-07102026_100741.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000011/form4-07102026_100741.xml","form_type":"4"}},{"id":711002,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-07-10T22:14:45.000Z","date":"2026-05-06","kind":"tax_withholding","planned":false,"acquired":false,"shares":88,"price":11.87,"value":1044.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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 (\"RSUs\")."}],"balance_after":591695,"source":{"system":"sec-edgar","filing":"0002084812-26-000011","document":"form4-07102026_100741.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000011/form4-07102026_100741.xml","form_type":"4"}},{"id":711001,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-07-10T22:14:45.000Z","date":"2026-04-06","kind":"tax_withholding","planned":false,"acquired":false,"shares":175,"price":8.41,"value":1471.75,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"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 (\"RSUs\")."}],"balance_after":591783,"source":{"system":"sec-edgar","filing":"0002084812-26-000011","document":"form4-07102026_100741.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000011/form4-07102026_100741.xml","form_type":"4"}},{"id":822462,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-04-01T22:09:54.000Z","date":"2026-03-30","kind":"grant","planned":false,"acquired":true,"shares":47125,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"Represents an award of restricted stock units (\"RSUs\") that vests in accordance with the terms of the award. 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The remaining 75% of the option will vest in equal monthly installments thereafter until such time as the options are 100% vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date."}],"balance_after":16000,"derivative":{"exercise_price":0.21,"expiration_date":"2032-10-06","underlying":"Class A Common Stock","underlying_shares":48000},"source":{"system":"sec-edgar","filing":"0002084812-26-000005","document":"form4-01242026_120149.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000005/form4-01242026_120149.xml","form_type":"4"}},{"id":931940,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Stock Option (Right to Buy)","published_at":"2026-01-24T00:39:53.000Z","date":"2025-09-25","kind":"exercise","planned":false,"acquired":false,"shares":125000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":".The transaction occurred prior to the Issuer's registration of a class of equity securities under Section 12 of the Exchange Act in connection with the Issuer's initial public offering, and the transaction is reported herein pursuant to Rule 16a-2(a)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":0.21,"expiration_date":"2032-06-29","underlying":"Class A Common Stock","underlying_shares":125000},"source":{"system":"sec-edgar","filing":"0002084812-26-000005","document":"form4-01242026_120149.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000005/form4-01242026_120149.xml","form_type":"4"}},{"id":931939,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-01-24T00:39:53.000Z","date":"2025-09-25","kind":"exercise","planned":false,"acquired":true,"shares":173000,"price":0.21,"value":36330.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":".The transaction occurred prior to the Issuer's registration of a class of equity securities under Section 12 of the Exchange Act in connection with the Issuer's initial public offering, and the transaction is reported herein pursuant to Rule 16a-2(a)."}],"balance_after":468000,"source":{"system":"sec-edgar","filing":"0002084812-26-000005","document":"form4-01242026_120149.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000005/form4-01242026_120149.xml","form_type":"4"}},{"id":931938,"issuer":{"id":5106,"kind":"organization","name":"BITGO HOLDINGS, INC.","symbol":"BTGO"},"owners":[{"id":24472,"kind":"person","name":"Reginelli Edward","position":1,"cik":"0002084812","reported_name":"Reginelli Edward","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Class A Common Stock","published_at":"2026-01-24T00:39:53.000Z","date":"2025-09-17","kind":"grant","planned":false,"acquired":true,"shares":26000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":".The transaction occurred prior to the Issuer's registration of a class of equity securities under Section 12 of the Exchange Act in connection with the Issuer's initial public offering, and the transaction is reported herein pursuant to Rule 16a-2(a)."},{"field":"date","element":"transactionDate","label":"F2","text":"Represents a restricted stock unit award that was acquired through an exempt transaction with the Issuer."}],"balance_after":295000,"source":{"system":"sec-edgar","filing":"0002084812-26-000005","document":"form4-01242026_120149.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1740604/000208481226000005/form4-01242026_120149.xml","form_type":"4"}}]}