Direct Answer
Amphenol reports revenue across 3 business segments in its fiscal 2025 Form 10-K. Communications Solutions is the largest, with $12.2 billion of revenue (53% of the total), followed by Harsh Environment Solutions at $5.9 billion (25%). 35% of revenue came from the United States.
How Does Amphenol Make Money?
No single line supplies a majority of revenue: the largest, Communications Solutions, is 53%, which spreads Amphenol's exposure across several demand drivers. Between fiscal 2024 and 2025, Communications Solutions grew fastest (+92.3%) and Interconnect and Sensor Systems slowest (+15.6%), so the revenue mix tilts toward Communications Solutions while that gap lasts.
| Segment | FY2025 revenue | FY2024 revenue | Share of revenue | Change |
|---|---|---|---|---|
| Communications Solutions | $12.2 billion | $6.3 billion | 52.7% | 92.3% |
| Harsh Environment Solutions | $5.9 billion | $4.4 billion | 25.5% | 33.1% |
| Interconnect and Sensor Systems | $5.2 billion | $4.5 billion | 22.6% | 15.6% |
Which Amphenol Segments Earn the Most?
| Segment | FY2025 segment operating income | Segment margin |
|---|---|---|
| Communications Solutions | $3.7 billion | 30.8% |
| Harsh Environment Solutions | $1.5 billion | 26.2% |
| Interconnect and Sensor Systems | $1.0 billion | 19.3% |
Segment operating income is the profit measure Amphenol reports to its chief operating decision maker for each segment. It usually leaves out corporate costs that are not allocated to a segment, so the segments usually add up to more than consolidated operating income, and margins are comparable within Amphenol more safely than against another company.
Where Does Amphenol's Revenue Come From?
Regions follow the definitions in the filing; most companies assign revenue by customer location.
| Region | FY2025 revenue | FY2024 revenue | Share of revenue | Change |
|---|---|---|---|---|
| Other Foreign Locations | $11.4 billion | $6.6 billion | 49.5% | 74.6% |
| United States | $8.0 billion | $5.3 billion | 34.6% | 51.5% |
| China | $3.7 billion | $3.4 billion | 15.9% | 8.0% |
What the Segment Figures Do Not Show
The rows above add up to 101% of Amphenol's reported revenue for fiscal 2025; the difference is intersegment eliminations, corporate revenue or items the company reports outside its segments. Segment definitions are management's choice and change when a company reorganizes, in which case it restates prior years in the next filing, so a multi-year comparison should use the figures from a single filing. Revenue shows where sales come from, not where profit or cash is earned: a small segment can carry most of the margin.
Where These Numbers Come From
Every figure on this page is a value Amphenol reported in the segment note and revenue disclosures of its Form 10-K filed February 11, 2026 (accession 0001104659-26-013549), read from the SEC's Financial Statement Data Sets. The prior-year column is the comparative figure from that same filing, so it reflects any restatement for a change in segments. Category names are the company's own XBRL labels, lightly reformatted for reading.
Rows that only total other rows (for example a "Products" line beside the individual products) are left out so nothing is counted twice. This page is educational and describes reported history for fiscal 2025; it is not a forecast or a recommendation.
Frequently Asked Questions
What are Amphenol's business segments?
In its fiscal 2025 Form 10-K, Amphenol reports revenue for Communications Solutions, Harsh Environment Solutions and Interconnect and Sensor Systems.
Which part of Amphenol brings in the most revenue?
Communications Solutions, with $12.2 billion of revenue in fiscal 2025, or 53% of the total.
How much of Amphenol's revenue comes from outside the United States?
65% in fiscal 2025, by the geographic breakdown Amphenol reports in its Form 10-K. Companies assign revenue to regions differently (customer location, shipping address or selling entity), so check the filing's definition before comparing companies.