{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"hhi-decomposition","count":21,"filters":{"market":"us-browser-usage","matched":true,"marketId":"mkt-browser","slug":"us-browser-usage","name":"U.S. browser usage","comparisonMode":"adjacent_releases","framework":"guidelines_2023","from":null,"residualFirmAssumption":4,"to":null,"repaired":[]},"summary":{"availableMarketCount":4,"availableReleaseCount":16,"availableAdjacentComparisonCount":12,"availableYearPairCount":24,"selectedComparisonCount":3,"selectedMarketCount":1,"selectedParticipantRowCount":21,"selectedSourceCount":1},"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions.","rows":[{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":2363.9044,"fromScenarioHhi":3654,"fromSharePercent":48.62,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":440.8572,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Chrome","participantSlug":"chrome","participantStatus":"continuing","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":4.34,"toClassification":"highly_concentrated","toHhiContribution":2804.7616,"toScenarioHhi":3840,"toSharePercent":52.96,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":1202.7024,"fromScenarioHhi":3654,"fromSharePercent":34.68,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":-244.7999,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Safari","participantSlug":"safari","participantStatus":"continuing","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":-3.73,"toClassification":"highly_concentrated","toHhiContribution":957.9025,"toScenarioHhi":3840,"toSharePercent":30.95,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":71.4025,"fromScenarioHhi":3654,"fromSharePercent":8.45,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":-16.1976,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Edge","participantSlug":"edge","participantStatus":"continuing","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":-1.02,"toClassification":"highly_concentrated","toHhiContribution":55.2049,"toScenarioHhi":3840,"toSharePercent":7.43,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":11.4921,"fromScenarioHhi":3654,"fromSharePercent":3.39,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":6.232,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Firefox","participantSlug":"firefox","participantStatus":"continuing","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":0.82,"toClassification":"highly_concentrated","toHhiContribution":17.7241,"toScenarioHhi":3840,"toSharePercent":4.21,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":3.1329,"fromScenarioHhi":3654,"fromSharePercent":3.54,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":-1.1307,"isResidual":true,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Other browsers","participantSlug":"other-browsers","participantStatus":"residual","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":-0.71,"toClassification":"highly_concentrated","toHhiContribution":2.0022,"toScenarioHhi":3840,"toSharePercent":2.83,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":1.7424,"fromScenarioHhi":3654,"fromSharePercent":1.32,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":0.882,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Samsung Internet","participantSlug":"samsung-internet","participantStatus":"continuing","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":0.3,"toClassification":"highly_concentrated","toHhiContribution":2.6244,"toScenarioHhi":3840,"toSharePercent":1.62,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0,"fromScenarioHhi":3654,"fromSharePercent":0,"fromSourceId":"statcounter-browser-us-2026","fromYear":2023,"hhiContributionChange":0,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":182,"participantLabel":"Brave","participantSlug":"brave","participantStatus":"continuing","possibleHhiChangeCeiling":195,"possibleHhiChangeFloor":174,"residualFirmAssumption":4,"scenarioHhiChange":186,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":3840,"toSharePercent":0,"toSourceId":"statcounter-browser-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":2804.7616,"fromScenarioHhi":3840,"fromSharePercent":52.96,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":-67.3792,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Chrome","participantSlug":"chrome","participantStatus":"continuing","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":-0.64,"toClassification":"highly_concentrated","toHhiContribution":2737.3824,"toScenarioHhi":3716,"toSharePercent":52.32,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":957.9025,"fromScenarioHhi":3840,"fromSharePercent":30.95,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":-57.3024,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Safari","participantSlug":"safari","participantStatus":"continuing","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":-0.94,"toClassification":"highly_concentrated","toHhiContribution":900.6001,"toScenarioHhi":3716,"toSharePercent":30.01,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0,"fromScenarioHhi":3840,"fromSharePercent":0,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":6.0516,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Brave","participantSlug":"brave","participantStatus":"entered","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":2.46,"toClassification":"highly_concentrated","toHhiContribution":6.0516,"toScenarioHhi":3716,"toSharePercent":2.46,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":55.2049,"fromScenarioHhi":3840,"fromSharePercent":7.43,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":-4.7949,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Edge","participantSlug":"edge","participantStatus":"continuing","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":-0.33,"toClassification":"highly_concentrated","toHhiContribution":50.41,"toScenarioHhi":3716,"toSharePercent":7.1,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":2.0022,"fromScenarioHhi":3840,"fromSharePercent":2.83,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":-0.5622,"isResidual":true,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Other browsers","participantSlug":"other-browsers","participantStatus":"residual","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":-0.43,"toClassification":"highly_concentrated","toHhiContribution":1.44,"toScenarioHhi":3716,"toSharePercent":2.4,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":2.6244,"fromScenarioHhi":3840,"fromSharePercent":1.62,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":-0.2835,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Samsung Internet","participantSlug":"samsung-internet","participantStatus":"continuing","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":-0.09,"toClassification":"highly_concentrated","toHhiContribution":2.3409,"toScenarioHhi":3716,"toSharePercent":1.53,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":17.7241,"fromScenarioHhi":3840,"fromSharePercent":4.21,"fromSourceId":"statcounter-browser-us-2026","fromYear":2024,"hhiContributionChange":-0.2517,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-126,"participantLabel":"Firefox","participantSlug":"firefox","participantStatus":"continuing","possibleHhiChangeCeiling":-118,"possibleHhiChangeFloor":-132,"residualFirmAssumption":4,"scenarioHhiChange":-125,"shareChangePoints":-0.03,"toClassification":"highly_concentrated","toHhiContribution":17.4724,"toScenarioHhi":3716,"toSharePercent":4.18,"toSourceId":"statcounter-browser-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":2737.3824,"fromScenarioHhi":3716,"fromSharePercent":52.32,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":-234.3815,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Chrome","participantSlug":"chrome","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":-2.29,"toClassification":"highly_concentrated","toHhiContribution":2503.0009,"toScenarioHhi":3608,"toSharePercent":50.03,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":900.6001,"fromScenarioHhi":3716,"fromSharePercent":30.01,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":114.4595,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Safari","participantSlug":"safari","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":1.85,"toClassification":"highly_concentrated","toHhiContribution":1015.0596,"toScenarioHhi":3608,"toSharePercent":31.86,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":50.41,"fromScenarioHhi":3716,"fromSharePercent":7.1,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":15.5244,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Edge","participantSlug":"edge","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":1.02,"toClassification":"highly_concentrated","toHhiContribution":65.9344,"toScenarioHhi":3608,"toSharePercent":8.12,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":17.4724,"fromScenarioHhi":3716,"fromSharePercent":4.18,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":-3.4099,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Firefox","participantSlug":"firefox","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":-0.43,"toClassification":"highly_concentrated","toHhiContribution":14.0625,"toScenarioHhi":3608,"toSharePercent":3.75,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":6.0516,"fromScenarioHhi":3716,"fromSharePercent":2.46,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":1.1845,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Brave","participantSlug":"brave","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":0.23,"toClassification":"highly_concentrated","toHhiContribution":7.2361,"toScenarioHhi":3608,"toSharePercent":2.69,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":1.44,"fromScenarioHhi":3716,"fromSharePercent":2.4,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":-0.327,"isResidual":true,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Other browsers","participantSlug":"other-browsers","participantStatus":"residual","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":-0.29,"toClassification":"highly_concentrated","toHhiContribution":1.113,"toScenarioHhi":3608,"toSharePercent":2.11,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-browser-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":2.3409,"fromScenarioHhi":3716,"fromSharePercent":1.53,"fromSourceId":"statcounter-browser-us-2026","fromYear":2025,"hhiContributionChange":-0.2673,"isResidual":false,"marketName":"U.S. browser usage","marketSlug":"us-browser-usage","observedHhiChange":-108,"participantLabel":"Samsung Internet","participantSlug":"samsung-internet","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-113,"residualFirmAssumption":4,"scenarioHhiChange":-107,"shareChangePoints":-0.09,"toClassification":"highly_concentrated","toHhiContribution":2.0736,"toScenarioHhi":3608,"toSharePercent":1.44,"toSourceId":"statcounter-browser-us-2026","toYear":2026,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. A participant's contribution can rise or fall because its observed share changed; the decomposition does not establish conduct, competitive effects, liability, or consumer harm. Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."}]}