{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"hhi-decomposition","count":27,"filters":{"market":"us-mobile-operating-system-usage","matched":true,"marketId":"mkt-mobile-os","slug":"us-mobile-operating-system-usage","name":"U.S. mobile operating-system web 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":27,"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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":3586.8121,"fromScenarioHhi":5157,"fromSharePercent":59.89,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":-391.1712,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"iOS","participantSlug":"ios","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":-3.36,"toClassification":"highly_concentrated","toHhiContribution":3195.6409,"toScenarioHhi":5055,"toSharePercent":56.53,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":1570.5369,"fromScenarioHhi":5157,"fromSharePercent":39.63,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":288.7975,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"Android","participantSlug":"android","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":3.49,"toClassification":"highly_concentrated","toHhiContribution":1859.3344,"toScenarioHhi":5055,"toSharePercent":43.12,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0784,"fromScenarioHhi":5157,"fromSharePercent":0.28,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":-0.0208,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"Samsung","participantSlug":"samsung-mobile-os","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":-0.04,"toClassification":"highly_concentrated","toHhiContribution":0.0576,"toScenarioHhi":5055,"toSharePercent":0.24,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0049,"fromScenarioHhi":5157,"fromSharePercent":0.07,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":-0.0045,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"Windows Phone","participantSlug":"windows-phone","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":-0.05,"toClassification":"highly_concentrated","toHhiContribution":0.0004,"toScenarioHhi":5055,"toSharePercent":0.02,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0016,"fromScenarioHhi":5157,"fromSharePercent":0.04,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":-0.0015,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"SymbianOS","participantSlug":"symbianos","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":-0.03,"toClassification":"highly_concentrated","toHhiContribution":0.0001,"toScenarioHhi":5055,"toSharePercent":0.01,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0002,"fromScenarioHhi":5157,"fromSharePercent":0.03,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":0.0002,"isResidual":true,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"Other mobile operating systems","participantSlug":"other-mobile-operating-systems","participantStatus":"residual","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":0.01,"toClassification":"highly_concentrated","toHhiContribution":0.0004,"toScenarioHhi":5055,"toSharePercent":0.04,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5157,"fromSharePercent":0.02,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":-0.0001,"isResidual":true,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"Unknown mobile OS","participantSlug":"mobile-os-unknown","participantStatus":"residual","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":-0.01,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5055,"toSharePercent":0.01,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5157,"fromSharePercent":0.01,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":0,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"KaiOS","participantSlug":"kaios","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0.0001,"toScenarioHhi":5055,"toSharePercent":0.01,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0004,"fromScenarioHhi":5157,"fromSharePercent":0.02,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2023,"hhiContributionChange":0,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":-102,"participantLabel":"Linux","participantSlug":"mobile-linux","participantStatus":"continuing","possibleHhiChangeCeiling":-102,"possibleHhiChangeFloor":-102,"residualFirmAssumption":4,"scenarioHhiChange":-102,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0.0004,"toScenarioHhi":5055,"toSharePercent":0.02,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":3195.6409,"fromScenarioHhi":5055,"fromSharePercent":56.53,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":122.1191,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"iOS","participantSlug":"ios","participantStatus":"continuing","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":1.07,"toClassification":"highly_concentrated","toHhiContribution":3317.76,"toScenarioHhi":5094,"toSharePercent":57.6,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":1859.3344,"fromScenarioHhi":5055,"fromSharePercent":43.12,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":-82.7119,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"Android","participantSlug":"android","participantStatus":"continuing","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.97,"toClassification":"highly_concentrated","toHhiContribution":1776.6225,"toScenarioHhi":5094,"toSharePercent":42.15,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0576,"fromScenarioHhi":5055,"fromSharePercent":0.24,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":-0.0176,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"Samsung","participantSlug":"samsung-mobile-os","participantStatus":"continuing","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.04,"toClassification":"highly_concentrated","toHhiContribution":0.04,"toScenarioHhi":5094,"toSharePercent":0.2,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0004,"fromScenarioHhi":5055,"fromSharePercent":0.02,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":-0.0004,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"Windows Phone","participantSlug":"windows-phone","participantStatus":"exited","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.02,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5094,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0004,"fromScenarioHhi":5055,"fromSharePercent":0.02,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":-0.0003,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"Linux","participantSlug":"mobile-linux","participantStatus":"continuing","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.01,"toClassification":"highly_concentrated","toHhiContribution":0.0001,"toScenarioHhi":5094,"toSharePercent":0.01,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0004,"fromScenarioHhi":5055,"fromSharePercent":0.04,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":-0.0003,"isResidual":true,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"Other mobile operating systems","participantSlug":"other-mobile-operating-systems","participantStatus":"residual","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.02,"toClassification":"highly_concentrated","toHhiContribution":0.0001,"toScenarioHhi":5094,"toSharePercent":0.02,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5055,"fromSharePercent":0.01,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":-0.0001,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"SymbianOS","participantSlug":"symbianos","participantStatus":"exited","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.01,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5094,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0,"fromScenarioHhi":5055,"fromSharePercent":0.01,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":0,"isResidual":true,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"Unknown mobile OS","participantSlug":"mobile-os-unknown","participantStatus":"residual","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":-0.01,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5094,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5055,"fromSharePercent":0.01,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2024,"hhiContributionChange":0,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":39,"participantLabel":"KaiOS","participantSlug":"kaios","participantStatus":"continuing","possibleHhiChangeCeiling":39,"possibleHhiChangeFloor":39,"residualFirmAssumption":4,"scenarioHhiChange":39,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0.0001,"toScenarioHhi":5094,"toSharePercent":0.01,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":3317.76,"fromScenarioHhi":5094,"fromSharePercent":57.6,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":661.3264,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"iOS","participantSlug":"ios","participantStatus":"continuing","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":5.48,"toClassification":"highly_concentrated","toHhiContribution":3979.0864,"toScenarioHhi":5337,"toSharePercent":63.08,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":1776.6225,"fromScenarioHhi":5094,"fromSharePercent":42.15,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":-418.7,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"Android","participantSlug":"android","participantStatus":"continuing","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":-5.3,"toClassification":"highly_concentrated","toHhiContribution":1357.9225,"toScenarioHhi":5337,"toSharePercent":36.85,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.04,"fromScenarioHhi":5094,"fromSharePercent":0.2,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":-0.0375,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"Samsung","participantSlug":"samsung-mobile-os","participantStatus":"continuing","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":-0.15,"toClassification":"highly_concentrated","toHhiContribution":0.0025,"toScenarioHhi":5337,"toSharePercent":0.05,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5094,"fromSharePercent":0.01,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":0.0003,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"KaiOS","participantSlug":"kaios","participantStatus":"continuing","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":0.01,"toClassification":"highly_concentrated","toHhiContribution":0.0004,"toScenarioHhi":5337,"toSharePercent":0.02,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5094,"fromSharePercent":0.01,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":-0.0001,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"Linux","participantSlug":"mobile-linux","participantStatus":"exited","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":-0.01,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5337,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0001,"fromScenarioHhi":5094,"fromSharePercent":0.02,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":-0.0001,"isResidual":true,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"Other mobile operating systems","participantSlug":"other-mobile-operating-systems","participantStatus":"residual","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":-0.02,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5337,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0,"fromScenarioHhi":5094,"fromSharePercent":0,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":0,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"SymbianOS","participantSlug":"symbianos","participantStatus":"continuing","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5337,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0,"fromScenarioHhi":5094,"fromSharePercent":0,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":0,"isResidual":true,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"Unknown mobile OS","participantSlug":"mobile-os-unknown","participantStatus":"residual","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5337,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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-mobile-operating-system-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0,"fromScenarioHhi":5094,"fromSharePercent":0,"fromSourceId":"statcounter-mobile-os-us-2026","fromYear":2025,"hhiContributionChange":0,"isResidual":false,"marketName":"U.S. mobile operating-system web usage","marketSlug":"us-mobile-operating-system-usage","observedHhiChange":243,"participantLabel":"Windows Phone","participantSlug":"windows-phone","participantStatus":"continuing","possibleHhiChangeCeiling":243,"possibleHhiChangeFloor":243,"residualFirmAssumption":4,"scenarioHhiChange":243,"shareChangePoints":0,"toClassification":"highly_concentrated","toHhiContribution":0,"toScenarioHhi":5337,"toSharePercent":0,"toSourceId":"statcounter-mobile-os-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."}]}