Antitrust Radar
Merger activity observatory

Scenario analysis / observed shares

Merger structure lab

Calculate a hypothetical concentration change from two published participant shares. This is an arithmetic screen, not a claim that a transaction exists or a legal conclusion.

Live scenarioiOS+Android
Delta HHI+4,649Post HHI9,986
Eligible markets
6
Observed firm-level shares
Observed periods
18
Definition-matched snapshots
Complete HHI screens
17
Baseline and post-merger HHI
Share observations
136
Named, source-labeled rows
Scenario layer

Market, observed period, and two source-labeled participants can change.

Evidence layer

Published shares, baseline HHI, source status, confidence, and definition remain fixed.

Interpretation layer

Numeric conditions are screening inputs, never a standalone liability or outcome claim.

Observed-share scenario

Structure screen

Mobile operating systemsUnited StatesPublic proxyUsage shares100%named share coverageComplete HHIMedium confidence

Digital platforms / 2026

iOS + Android

2 x 63.08% x 36.85% = 4649 HHI points
Numeric condition crossedThe selected shares cross both published Guideline 1 numeric paths.
Baseline HHI
5,337
2026 published anchor
Delta HHI
+4,649
Exact 2ab arithmetic
Post-merger HHI
9,986
Published baseline + delta
Merged share
99.93%
63.08% + 36.85%
Participant geometryObserved shares, combined only for this scenario
Observed2026
CombinedScenario
iOS + Android99.93%Samsung0.05%KaiOS0.02%Linux0%Other mobile operating systems0%SymbianOS0%Unknown mobile OS0%Windows Phone0%
Guideline 1 numeric pathsOfficial reference
Guideline 1 HHI threshold planePost-merger HHI is plotted horizontally and the merger-related HHI increase vertically. The published numeric path is above 1,800 post-merger HHI and above 100 delta HHI. The selected scenario plots at post-merger HHI 9986 and delta HHI 4649.02,5005,0007,50010,00002,5005,000HHI 1,800Delta 100Post-merger HHIDelta HHI
Merged-firm share path99.93%

Share above 30% and delta HHI above 100: crossed

Evidence contractOpen market profile

The scenario inherits this published boundary

Product
Mobile operating-system web usage detected in mobile page views
Geography
United States
Measurement
StatCounter mobile operating-system page-view share
Denominator
U.S. mobile page views recorded on StatCounter-tracked websites in each pinned April snapshot

IncludedEvery operating-system category published in the source row, including small and Other categories

ExcludedDevice sales, installed base, active devices, app-store activity, operating-system revenue, desktop usage, and tying conduct

LimitationPage-view usage is a public web-analytics proxy. It does not measure devices, users, sales, revenue, or a legally defined mobile operating-system market.

Reusable scenario packet

Carry the exact inputs into research

Antitrust Radar, Merger Structure Lab: iOS + Android in U.S. mobile operating-system web usage (2026); observed shares 63.08% and 36.85%; ΔHHI 4649; post-merger HHI 9986.
JSONCSV

Source custody

Mobile operating system market share in United States of America, April 2023-April 2026StatCounter Global Stats2023 Merger Guidelines, Guideline 1U.S. Department of Justice and Federal Trade Commission / December 18, 2023

01This tool combines two observed shares as a research scenario. It does not report an actual transaction, define a legal market, or predict an agency or court outcome.

02The calculation inherits the published public proxy boundary, United States, measurement basis, denominator, and source limitations shown below.

03The post-merger HHI adds the exact share-based delta to the published, rounded baseline HHI; small rounding differences can remain.

04Guideline 1 concentration arithmetic is one screening framework. The Merger Guidelines identify additional fact-specific theories, evidence, and rebuttal considerations.

The JSON and CSV packets preserve the selected shares, arithmetic, thresholds, evidence status, definition contract, sources, citation, and guardrails.

Merger Structure Lab | Antitrust Radar