{"license":"https://creativecommons.org/licenses/by/4.0/","dataset":"hhi-decomposition","count":21,"filters":{"market":"us-search-engine-usage","matched":true,"marketId":"mkt-search","slug":"us-search-engine-usage","name":"U.S. search engine 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-search-engine-usage-2023-2024-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":7899.6544,"fromScenarioHhi":7950,"fromSharePercent":88.88,"fromSourceId":"statcounter-search-us-2026","fromYear":2023,"hhiContributionChange":-403.558,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-375,"participantLabel":"Google Search","participantSlug":"google-search","participantStatus":"continuing","possibleHhiChangeCeiling":-375,"possibleHhiChangeFloor":-375,"residualFirmAssumption":4,"scenarioHhiChange":-375,"shareChangePoints":-2.3,"toClassification":"highly_concentrated","toHhiContribution":7496.0964,"toScenarioHhi":7575,"toSharePercent":86.58,"toSourceId":"statcounter-search-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-search-engine-usage-2023-2024-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":41.3449,"fromScenarioHhi":7950,"fromSharePercent":6.43,"fromSourceId":"statcounter-search-us-2026","fromYear":2023,"hhiContributionChange":26.5527,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-375,"participantLabel":"Bing","participantSlug":"bing","participantStatus":"continuing","possibleHhiChangeCeiling":-375,"possibleHhiChangeFloor":-375,"residualFirmAssumption":4,"scenarioHhiChange":-375,"shareChangePoints":1.81,"toClassification":"highly_concentrated","toHhiContribution":67.8976,"toScenarioHhi":7575,"toSharePercent":8.24,"toSourceId":"statcounter-search-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. 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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-search-engine-usage-2023-2024-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0225,"fromScenarioHhi":7950,"fromSharePercent":0.15,"fromSourceId":"statcounter-search-us-2026","fromYear":2023,"hhiContributionChange":0.0259,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-375,"participantLabel":"Yandex","participantSlug":"yandex","participantStatus":"continuing","possibleHhiChangeCeiling":-375,"possibleHhiChangeFloor":-375,"residualFirmAssumption":4,"scenarioHhiChange":-375,"shareChangePoints":0.07,"toClassification":"highly_concentrated","toHhiContribution":0.0484,"toScenarioHhi":7575,"toSharePercent":0.22,"toSourceId":"statcounter-search-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-search-engine-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0064,"fromScenarioHhi":7950,"fromSharePercent":0.16,"fromSourceId":"statcounter-search-us-2026","fromYear":2023,"hhiContributionChange":0.0046,"isResidual":true,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-375,"participantLabel":"Other search engines","participantSlug":"other-search-engines","participantStatus":"residual","possibleHhiChangeCeiling":-375,"possibleHhiChangeFloor":-375,"residualFirmAssumption":4,"scenarioHhiChange":-375,"shareChangePoints":0.05,"toClassification":"highly_concentrated","toHhiContribution":0.011,"toScenarioHhi":7575,"toSharePercent":0.21,"toSourceId":"statcounter-search-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-search-engine-usage-2023-2024-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0049,"fromScenarioHhi":7950,"fromSharePercent":0.07,"fromSourceId":"statcounter-search-us-2026","fromYear":2023,"hhiContributionChange":0.0015,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-375,"participantLabel":"Ecosia","participantSlug":"ecosia","participantStatus":"continuing","possibleHhiChangeCeiling":-375,"possibleHhiChangeFloor":-375,"residualFirmAssumption":4,"scenarioHhiChange":-375,"shareChangePoints":0.01,"toClassification":"highly_concentrated","toHhiContribution":0.0064,"toScenarioHhi":7575,"toSharePercent":0.08,"toSourceId":"statcounter-search-us-2026","toYear":2024,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. 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Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-search-engine-usage-2024-2025-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":7496.0964,"fromScenarioHhi":7575,"fromSharePercent":86.58,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":22.5277,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"Google Search","participantSlug":"google-search","participantStatus":"continuing","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":0.13,"toClassification":"highly_concentrated","toHhiContribution":7518.6241,"toScenarioHhi":7589,"toSharePercent":86.71,"toSourceId":"statcounter-search-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. 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Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-search-engine-usage-2024-2025-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":67.8976,"fromScenarioHhi":7575,"fromSharePercent":8.24,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":-11.6476,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"Bing","participantSlug":"bing","participantStatus":"continuing","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":-0.74,"toClassification":"highly_concentrated","toHhiContribution":56.25,"toScenarioHhi":7589,"toSharePercent":7.5,"toSourceId":"statcounter-search-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. 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Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-search-engine-usage-2024-2025-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":6.7081,"fromScenarioHhi":7575,"fromSharePercent":2.59,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":1.4715,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"Yahoo Search","participantSlug":"yahoo-search","participantStatus":"continuing","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":0.27,"toClassification":"highly_concentrated","toHhiContribution":8.1796,"toScenarioHhi":7589,"toSharePercent":2.86,"toSourceId":"statcounter-search-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. 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Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-search-engine-usage-2024-2025-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":4.3264,"fromScenarioHhi":7575,"fromSharePercent":2.08,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":1.1492,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"DuckDuckGo","participantSlug":"duckduckgo","participantStatus":"continuing","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":0.26,"toClassification":"highly_concentrated","toHhiContribution":5.4756,"toScenarioHhi":7589,"toSharePercent":2.34,"toSourceId":"statcounter-search-us-2026","toYear":2025,"guardrail":"HHI contribution changes are descriptive share-squared arithmetic, not causal estimates. 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Aggregate residual categories remain sensitivity assumptions rather than observed firm distributions."},{"comparisonId":"us-search-engine-usage-2024-2025-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0484,"fromScenarioHhi":7575,"fromSharePercent":0.22,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":0.054,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"Yandex","participantSlug":"yandex","participantStatus":"continuing","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":0.1,"toClassification":"highly_concentrated","toHhiContribution":0.1024,"toScenarioHhi":7589,"toSharePercent":0.32,"toSourceId":"statcounter-search-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-search-engine-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.011,"fromScenarioHhi":7575,"fromSharePercent":0.21,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":-0.0029,"isResidual":true,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"Other search engines","participantSlug":"other-search-engines","participantStatus":"residual","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":-0.03,"toClassification":"highly_concentrated","toHhiContribution":0.0081,"toScenarioHhi":7589,"toSharePercent":0.18,"toSourceId":"statcounter-search-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-search-engine-usage-2024-2025-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0064,"fromScenarioHhi":7575,"fromSharePercent":0.08,"fromSourceId":"statcounter-search-us-2026","fromYear":2024,"hhiContributionChange":0.0017,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":14,"participantLabel":"Ecosia","participantSlug":"ecosia","participantStatus":"continuing","possibleHhiChangeCeiling":14,"possibleHhiChangeFloor":14,"residualFirmAssumption":4,"scenarioHhiChange":14,"shareChangePoints":0.01,"toClassification":"highly_concentrated","toHhiContribution":0.0081,"toScenarioHhi":7589,"toSharePercent":0.09,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":7518.6241,"fromScenarioHhi":7589,"fromSharePercent":86.71,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":-266.3985,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"Google Search","participantSlug":"google-search","participantStatus":"continuing","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":-1.55,"toClassification":"highly_concentrated","toHhiContribution":7252.2256,"toScenarioHhi":7359,"toSharePercent":85.16,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":56.25,"fromScenarioHhi":7589,"fromSharePercent":7.5,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":40.1824,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"Bing","participantSlug":"bing","participantStatus":"continuing","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":2.32,"toClassification":"highly_concentrated","toHhiContribution":96.4324,"toScenarioHhi":7359,"toSharePercent":9.82,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":5.4756,"fromScenarioHhi":7589,"fromSharePercent":2.34,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":-2.448,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"DuckDuckGo","participantSlug":"duckduckgo","participantStatus":"continuing","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":-0.6,"toClassification":"highly_concentrated","toHhiContribution":3.0276,"toScenarioHhi":7359,"toSharePercent":1.74,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"decreased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":8.1796,"fromScenarioHhi":7589,"fromSharePercent":2.86,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":-1.0507,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"Yahoo Search","participantSlug":"yahoo-search","participantStatus":"continuing","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":-0.19,"toClassification":"highly_concentrated","toHhiContribution":7.1289,"toScenarioHhi":7359,"toSharePercent":2.67,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"increased","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.1024,"fromScenarioHhi":7589,"fromSharePercent":0.32,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":0.042,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"Yandex","participantSlug":"yandex","participantStatus":"continuing","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":0.06,"toClassification":"highly_concentrated","toHhiContribution":0.1444,"toScenarioHhi":7359,"toSharePercent":0.38,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0081,"fromScenarioHhi":7589,"fromSharePercent":0.18,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":-0.0045,"isResidual":true,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"Other search engines","participantSlug":"other-search-engines","participantStatus":"residual","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":-0.06,"toClassification":"highly_concentrated","toHhiContribution":0.0036,"toScenarioHhi":7359,"toSharePercent":0.12,"toSourceId":"statcounter-search-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-search-engine-usage-2025-2026-4","deltaDirection":"unchanged","framework":"guidelines_2023","fromClassification":"highly_concentrated","fromHhiContribution":0.0081,"fromScenarioHhi":7589,"fromSharePercent":0.09,"fromSourceId":"statcounter-search-us-2026","fromYear":2025,"hhiContributionChange":0.004,"isResidual":false,"marketName":"U.S. search engine usage","marketSlug":"us-search-engine-usage","observedHhiChange":-230,"participantLabel":"Ecosia","participantSlug":"ecosia","participantStatus":"continuing","possibleHhiChangeCeiling":-230,"possibleHhiChangeFloor":-230,"residualFirmAssumption":4,"scenarioHhiChange":-230,"shareChangePoints":0.02,"toClassification":"highly_concentrated","toHhiContribution":0.0121,"toScenarioHhi":7359,"toSharePercent":0.11,"toSourceId":"statcounter-search-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."}]}