| Held office | U.S. Senate | Sitting member of the U.S. Senate in the 119th Congress. | Source |
| Member of | Seapower Subcommittee | Member of Seapower Subcommittee (119th Congress). | Source |
| Member of | Personnel Subcommittee | Member of Personnel Subcommittee (119th Congress). | Source |
| Member of | Readiness and Management Support Subcommittee | Member of Readiness and Management Support Subcommittee (119th Congress). | Source |
| Member of | Armed Services Committee | Member of Armed Services Committee (119th Congress). | Source |
| Member of | Energy and Natural Resources Committee | Member of Energy and Natural Resources Committee (119th Congress). | Source |
| Member of | Public Lands, Forests, and Mining Subcommittee | Member of Public Lands, Forests, and Mining Subcommittee (119th Congress). | Source |
| Member of | Energy Subcommittee | Member of Energy Subcommittee (119th Congress). | Source |
| Member of | National Parks Subcommittee | Member of National Parks Subcommittee (119th Congress). | Source |
| Member of | Constitution Subcommittee | Member of Constitution Subcommittee (119th Congress). | Source |
| Member of | Small Business and Entrepreneurship Committee | Member of Small Business and Entrepreneurship Committee (119th Congress). | Source |
| Member of | Federal Courts, Oversight, Agency Action, and Federal Rights Subcommittee | Member of Federal Courts, Oversight, Agency Action, and Federal Rights Subcommittee (119th Congress). | Source |
| Member of | Border Security and Immigration Subcommittee | Member of Border Security and Immigration Subcommittee (119th Congress). | Source |
| Member of | Intellectual Property Subcommittee | Member of Intellectual Property Subcommittee (119th Congress). | Source |
| Member of | Judiciary Committee | Member of Judiciary Committee (119th Congress). | Source |
| Member of | Veterans' Affairs Committee | Member of Veterans' Affairs Committee (119th Congress). | Source |
| Voted on | GENIUS Act, Guiding and Establishing National Innovation for U.S. Stablecoins (S.394) | Vote nay on roll call 318 | Source |
| Donated to | TAMMY BALDWIN FOR SENATE | Donated $3,300 to TAMMY BALDWIN FOR SENATE | Source |
| Donated to | DSCC | Donated $250,000 to DSCC | Source |
| Donated to | DEMOCRATIC PARTY OF HAWAII | Donated $10,000 to DEMOCRATIC PARTY OF HAWAII | Source |
| Donated to | FRIENDS OF SHERROD BROWN | Donated $3,300 to FRIENDS OF SHERROD BROWN | Source |
| Donated to | ActBlue conduit — unresolved contributors (ceecda5f) | Donated $11,850 to ACTBLUE | Source |
| Donated to | TOKUDA FOR HAWAII | Donated $2,000 to TOKUDA FOR HAWAII | Source |
| Donated to | EMILY'S LIST | Donated $5,000 to EMILYS LIST | Source |
| Voted on | Ratepayer Protection Act (H.R. 9340) | Vote nay on roll call 254 (On Cloture on the Motion to Proceed) | Source |
| Voted on | Disapproval of SEC Staff Accounting Bulletin 121 | Vote nay on roll call 169 | Source |
| Voted on | One Big Beautiful Bill Act (H.R. 1, 119th) | Vote nay on roll call 372 (On Passage) | Source |
| Voted on | Striking the AI-preemption from H.R. 1 (Blackburn Amdt. 2814) | Vote yea on roll call 363 (On the Amendment) | Source |
| Voted on | ADVANCE Act / Fire Grants and Safety Act (S. 870) | Vote yea on roll call 200 (Motion to Concur in the House Amendments) | Source |
| Voted on | CHIPS and Science Act | Vote yea on roll call 271 (Motion to Concur) | Source |
| Voted on | A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Ocean Energy Management relating to "Protection of Marine Archaeological Resources". | Vote nay on roll call 92 | Source |
| Voted on | A joint resolution terminating the national emergency declared to impose global tariffs. | Vote yea on roll call 225 | Source |
| Voted on | A joint resolution disapproving the rule submitted by the Bureau of Consumer Financial Protection relating to "Overdraft Lending: Very Large Financial Institutions". | Vote nay on roll call 153 | Source |
| Voted on | A joint resolution disapproving the rule submitted by the Bureau of Consumer Financial Protection relating to "Defining Larger Participants of a Market for General-Use Digital Consumer Payment Applications". | Vote nay on roll call 106 | Source |
| Voted on | A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Office of the Comptroller of the Currency of the Department of the Treasury relating to the review of applications under the Bank Merger Act. | Vote nay on roll call 237 | Source |
| Voted on | A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "Review of Final Rule Reclassification of Major Sources as Area Sources Under Section 112 of the Clean Air Act". | Vote nay on roll call 229 | Source |
| Voted on | A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to "National Petroleum Reserve in Alaska Integrated Activity Plan Record of Decision". | Vote nay on roll call 599 | Source |
| Voted on | A joint resolution to direct the removal of United States Armed Forces from hostilities within or against Venezuela that have not been authorized by Congress. | Vote nay on roll call 9 | Source |
| Voted on | Full-Year Continuing Appropriations and Extensions Act, 2025 | Vote nay on roll call 133 | Source |
| Voted on | Rescissions Act of 2025 | Vote nay on roll call 411 | Source |
| Voted on | Continuing Appropriations, Agriculture, Legislative Branch, Military Construction and Veterans Affairs, and Extensions Act, 2026 | Vote nay on roll call 618 | Source |
| Voted on | 21st Century ROAD to Housing Act | Vote yea on roll call 182 | Source |
| Voted on | Commerce, Justice, Science; Energy and Water Development; and Interior and Environment Appropriations Act, 2026 | Vote yea on roll call 11 | Source |
| Voted on | Consolidated Appropriations Act, 2026 | Vote yea on roll call 20 | Source |
| Voted on | Homeland Security and Further Additional Continuing Appropriations Act, 2026. | Vote nay on roll call 74 | Source |
| Voted on | Laken Riley Act | Vote nay on roll call 7 | Source |
| Voted on | HALT Fentanyl Act | Vote nay on roll call 127 | Source |
| Voted on | National Defense Authorization Act for Fiscal Year 2026 | Vote yea on roll call 648 | Source |
| Voted on | Secure America Act | Vote nay on roll call 163 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "Waste Emissions Charge for Petroleum and Natural Gas Systems: Procedures for Facilitating Compliance, Including Netting and Exemptions". | Vote nay on roll call 97 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Internal Revenue Service relating to "Gross Proceeds Reporting by Brokers That Regularly Provide Services Effectuating Digital Asset Sales". | Vote nay on roll call 151 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Department of Energy relating to "Energy Conservation Program: Energy Conservation Standards for Consumer Gas-fired Instantaneous Water Heaters". | Vote nay on roll call 207 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Department of Energy relating to "Energy Conservation Program: Energy Conservation Standards for Walk-In Coolers and Walk-In Freezers". | Vote nay on roll call 162 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Department of Energy relating to "Energy Conservation Program for Appliance Standards: Certification Requirements, Labeling Requirements, and Enforcement Provisions for Certain Consumer Products and Commercial Equipment". | Vote nay on roll call 223 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Office of Energy Efficiency and Renewable Energy, Department of Energy relating to "Energy Conservation Program: Energy Conservation Standards for Commercial Refrigerators, Freezers, and Refrigerator-Freezers". | Vote nay on roll call 228 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the National Park Service relating to "Glen Canyon National Recreation Area: Motor Vehicles". | Vote nay on roll call 239 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "National Emission Standards for Hazardous Air Pollutants: Rubber Tire Manufacturing". | Vote nay on roll call 232 | Source |
| Voted on | Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine and Nonroad Engine Pollution Control Standards; The "Omnibus" Low NOX Regulation; Waiver of Preemption; Notice of Decision". | Vote nay on roll call 281 | Source |
| Voted on | Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Advanced Clean Cars II; Waiver of Preemption; Notice of Decision". | Vote nay on roll call 277 | Source |
| Voted on | Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Heavy-Duty Vehicle and Engine Emission Warranty and Maintenance Provisions; Advanced Clean Trucks; Zero Emission Airport Shuttle; Zero-Emission Power Train Certification; Waiver of Preemption; Notice of Decision". | Vote nay on roll call 279 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to "Miles City Field Office Record of Decision and Approved Resource Management Plan Amendment". | Vote nay on roll call 549 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to "North Dakota Field Office Record of Decision and Approved Resource Management Plan". | Vote nay on roll call 556 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to "Central Yukon Record of Decision and Approved Resource Management Plan". | Vote nay on roll call 560 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to Buffalo Field Office Record of Decision and Approved Resource Management Plan Amendment. | Vote nay on roll call 623 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to Coastal Plain Oil and Gas Leasing Program Record of Decision. | Vote nay on roll call 632 | Source |
| Voted on | Disapproving the action of the District of Columbia Council in approving the D.C. Income and Franchise Tax Conformity and Revision Temporary Amendment Act of 2025. | Vote nay on roll call 37 | Source |
| Voted on | Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Bureau of Land Management relating to Public Land Order No. 7917 for Withdrawal of Federal Lands; Cook, Lake, and Saint Louis Counties, MN. | Vote nay on roll call 84 | Source |
| Voted on | Social Security Fairness Act of 2023 | Vote yea on roll call 338 | Source |
| Voted on | Making emergency supplemental appropriations for the fiscal year ending September 30, 2024, and for other purposes. | Vote yea on roll call 154 | Source |
| Voted on | National Defense Authorization Act for Fiscal Year 2024 | Vote yea on roll call 343 | Source |
| Voted on | Making further continuing appropriations for the fiscal year ending September 30, 2024, and for other purposes. | Vote yea on roll call 12 | Source |
| Voted on | Further Consolidated Appropriations Act, 2024 | Vote yea on roll call 114 | Source |
| Voted on | Fiscal Responsibility Act of 2023 | Vote yea on roll call 146 | Source |
| Voted on | FAA Reauthorization Act of 2024 | Vote yea on roll call 162 | Source |
| Voted on | Consolidated Appropriations Act, 2024 | Vote yea on roll call 84 | Source |
| Voted on | Servicemember Quality of Life Improvement and National Defense Authorization Act for Fiscal Year 2025 | Vote yea on roll call 325 | Source |
| Voted on | Continuing Appropriations Act, 2024 and Other Extensions Act | Vote yea on roll call 247 | Source |
| Voted on | Further Continuing Appropriations and Other Extensions Act, 2024 | Vote yea on roll call 312 | Source |
| Affiliated with | FRIENDS OF MAZIE HIRONO | FRIENDS OF MAZIE HIRONO is the principal campaign committee of Mazie K. Hirono (FEC committee C00420760, designation P; candidate S2HI00106). | Source |
