Commercial Air and Defense: Long ProgrammesWide moat

Amphenol (APH) — moat facet

Aerospace and defense are only about an eighth of Amphenol's sales but carry its stickiest designs, and it bought CIT and Trexon to own more of them.

The markets where switching costs are highest are also some of Amphenol's smallest. Commercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 20231234, 6% in 20245, 5% in 20256 and 4% in the June 2026 quarter7. Defense, called military until 2022, was 12% in 20198, 11% in 20249, 9% in 202510 and 8% in the quarter11.

Defense and commercial aerospace share of Amphenol sales (%)12 + 5201912 + 3202011 + 2202111 + 4202311 + 620249 + 520258 + 4Q2 2026Amphenol Forms 10-K FY2019-FY2025, markets section; Q2 2026 call (defense + commercial air)
About an eighth of sales, split roughly two to one.

A connector qualified into an aircraft or a weapons system is hard to replace. Changing it can mean re-testing the system, and the programmes run for decades. That is why Amphenol bought into these markets rather than waiting to grow into them: CIT for about $1,995.3 million in 202412 for "commercial air, defense and industrial markets"13, and Trexon for $1,050.3 million in 2025, "primarily for the defense market"14. Both went into Harsh Environment Solutions1516.

The pandemic showed what such markets do in a shock. Commercial aerospace fell from 5% of sales in 2019 to 2% in 2021 as aircraft stopped flying, and it took until 2024 to reach 6%. Defense barely moved.

Growth is strong now. In the June 2026 quarter defense sales rose 37% in dollars and 24% organically, and commercial air 22% and 21%17, which management put down to "increased aircraft production volumes and higher content on next-generation platforms"18.

The factories are built for it. Many are certified to AS9100, the aerospace quality standard, alongside ISO900119, and Harsh Environment Solutions, where these businesses sit, sold $1,856.8 million in the June 2026 quarter, up 28%2021. The acquisitions landed in the segment built for them. In 2025, "three acquisitions, including Trexon, are included in the Harsh Environment Solutions segment"22, and the segment's June-quarter margin was 30.1%23. Commercial air grew 21% organically in the June quarter against 22% reported24, so little of that growth was bought.

If commercial aerospace and defense together fall below 10% of sales while both still grow organically, they will simply have been outgrown by AI; the moat here would be threatened only by organic declines in a year when aircraft production rises.

Moat trajectory: Widening

Defense +24% and commercial air +21% organic in Q2 2026.

The number that tests this moat
Reported
Commercial aerospace share of sales, latest quarter
4% (Q2 2026), from 5% for 2025

The weight of the stickiest programmes; organic decline in a year of rising aircraft output would signal lost positions.

Source: Amphenol Q2 2026 earnings call ↗
⚠ Threats to the moat
⚠ THREAT 01
Harsh Environment Depends on Washington
More than half of Harsh Environment Solutions' sales go to American customers, and its record 30.1% margin is riding a defense upswing Amphenol does…
References
  1. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol Corporation Form 10-K for fiscal 2019 - the five-year selected financial data for 2015-2019, the largest customer at about 12% of 2018 sales, China sales and backlog. — FY2019 · publ. February 2020 · source ↗
  2. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol Corporation Form 10-K for fiscal 2020 - employees, general managers, end-market shares and backlog for 2020. — FY2020 · publ. February 2021 · source ↗
  3. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol Corporation Form 10-K for fiscal 2021 - the MTS and Halo acquisitions, the largest customer at about 11% of 2020 sales, China sales and backlog. — FY2021 · publ. February 2022 · source ↗
  4. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol Corporation Form 10-K for fiscal 2023 - end-market shares, China sales, employees, general managers and backlog for 2023. — FY2023 · publ. February 2024 · source ↗
  5. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol Corporation Form 10-K for fiscal 2024 - the CIT acquisition, segment sales shares, employees, general managers and backlog. — FY2024 · publ. February 2025 · source ↗
  6. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol Corporation Form 10-K for fiscal 2025 (year ended 31 December 2025) - Item 1 business, markets and customers: end markets, applications and customer types. — FY2025 · publ. 11 February 2026 · source ↗
  7. ReportedCommercial aerospace was about 5% of sales in 2019, 3% in 2020, 2% in 2021 and 4% in 2023, 6% in 2024, 5% in 2025 and 4% in the June 2026 quarter.
    Amphenol second-quarter 2026 earnings call transcript (Motley Fool) - end-market shares and growth, CommScope, orders, debt and leverage - end-market shares and growth. — Q2 2026 · publ. August 2026 · source ↗
  8. ReportedDefense, called military until 2022, was 12% in 2019, 11% in 2024, 9% in 2025 and 8% in the quarter.
    Amphenol Corporation Form 10-K for fiscal 2019 - the five-year selected financial data for 2015-2019, the largest customer at about 12% of 2018 sales, China sales and backlog. — FY2019 · publ. February 2020 · source ↗
  9. ReportedDefense, called military until 2022, was 12% in 2019, 11% in 2024, 9% in 2025 and 8% in the quarter.
    Amphenol Corporation Form 10-K for fiscal 2024 - the CIT acquisition, segment sales shares, employees, general managers and backlog. — FY2024 · publ. February 2025 · source ↗
  10. ReportedDefense, called military until 2022, was 12% in 2019, 11% in 2024, 9% in 2025 and 8% in the quarter.
    Amphenol Corporation Form 10-K for fiscal 2025 (year ended 31 December 2025) - Item 1 business, markets and customers: end markets, applications and customer types. — FY2025 · publ. 11 February 2026 · source ↗
  11. ReportedDefense, called military until 2022, was 12% in 2019, 11% in 2024, 9% in 2025 and 8% in the quarter.
    Amphenol second-quarter 2026 earnings call transcript (Motley Fool) - end-market shares and growth, CommScope, orders, debt and leverage - end-market shares and growth. — Q2 2026 · publ. August 2026 · source ↗
  12. ReportedThat is why Amphenol bought into these markets rather than waiting to grow into them: CIT for about $1,995.3 million in 2024 for "commercial air, defense and industrial markets", and Trexon for $1,050.3 million in 2025, "primarily for the defense market".
    Amphenol Corporation Form 10-K for fiscal 2024 - the CIT acquisition, segment sales shares, employees, general managers and backlog. — FY2024 · publ. February 2025 · source ↗
  13. ReportedThat is why Amphenol bought into these markets rather than waiting to grow into them: CIT for about $1,995.3 million in 2024 for "commercial air, defense and industrial markets", and Trexon for $1,050.3 million in 2025, "primarily for the defense market".
    Amphenol release of 21 May 2024, Form 8-K exhibit 99.1 - completion of the CIT acquisition from Carlisle. — May 2024 · publ. 21 May 2024 · source ↗
  14. ReportedThat is why Amphenol bought into these markets rather than waiting to grow into them: CIT for about $1,995.3 million in 2024 for "commercial air, defense and industrial markets", and Trexon for $1,050.3 million in 2025, "primarily for the defense market".
    Amphenol Corporation Form 10-K for fiscal 2025 (year ended 31 December 2025) - acquisitions: Andrew, Trexon, CommScope, goodwill and the acquisition strategy. — FY2025 · publ. 11 February 2026 · source ↗
  15. ReportedBoth went into Harsh Environment Solutions.
    Amphenol Corporation Form 10-K for fiscal 2024 - the CIT acquisition, segment sales shares, employees, general managers and backlog. — FY2024 · publ. February 2025 · source ↗
  16. ReportedBoth went into Harsh Environment Solutions.
    Amphenol Corporation Form 10-K for fiscal 2025 (year ended 31 December 2025) - segment note (Note 13): segment sales and operating income, geography and sales channel. — FY2025 · publ. 11 February 2026 · source ↗
  17. ReportedIn the June 2026 quarter defense sales rose 37% in dollars and 24% organically, and commercial air 22% and 21%, which management put down to "increased aircraft production volumes and higher content on next-generation platforms".
    Amphenol second-quarter 2026 earnings call transcript (Motley Fool) - end-market shares and growth, CommScope, orders, debt and leverage - end-market shares and growth. — Q2 2026 · publ. August 2026 · source ↗
  18. ReportedIn the June 2026 quarter defense sales rose 37% in dollars and 24% organically, and commercial air 22% and 21%, which management put down to "increased aircraft production volumes and higher content on next-generation platforms".
    Amphenol second-quarter 2026 earnings call transcript (Motley Fool) - end-market shares and growth, CommScope, orders, debt and leverage - end-market shares and growth. — Q2 2026 · publ. August 2026 · source ↗
  19. ReportedMany are certified to AS9100, the aerospace quality standard, alongside ISO9001, and Harsh Environment Solutions, where these businesses sit, sold $1,856.8 million in the June 2026 quarter, up 28%.
    Amphenol Corporation Form 10-K for fiscal 2025 (year ended 31 December 2025) - segment note (Note 13): segment sales and operating income, geography and sales channel. — FY2025 · publ. 11 February 2026 · source ↗
  20. ReportedMany are certified to AS9100, the aerospace quality standard, alongside ISO9001, and Harsh Environment Solutions, where these businesses sit, sold $1,856.8 million in the June 2026 quarter, up 28%.
    Amphenol second-quarter 2026 results release, Form 8-K exhibit 99.1 - net sales, orders, segment sales and operating income, cash flow, CommScope outlook and third-quarter guidance - segment sales, operating income and margins. — Q2 2026 · publ. 29 July 2026 · source ↗
  21. ReportedMany are certified to AS9100, the aerospace quality standard, alongside ISO9001, and Harsh Environment Solutions, where these businesses sit, sold $1,856.8 million in the June 2026 quarter, up 28%.
    Amphenol second-quarter 2026 earnings call transcript (Motley Fool) - end-market shares and growth, CommScope, orders, debt and leverage - end-market shares and growth. — Q2 2026 · publ. August 2026 · source ↗
  22. ReportedIn 2025, "three acquisitions, including Trexon, are included in the Harsh Environment Solutions segment", and the segment's June-quarter margin was 30.1%.
    Amphenol Corporation Form 10-Q for the quarter ended 30 June 2026 - the CommScope purchase price allocation, CommScope's contribution, China sales, debt and buyback authorisation. — Q2 2026 · publ. 31 July 2026 · source ↗
  23. ReportedIn 2025, "three acquisitions, including Trexon, are included in the Harsh Environment Solutions segment", and the segment's June-quarter margin was 30.1%.
    Amphenol second-quarter 2026 results release, Form 8-K exhibit 99.1 - net sales, orders, segment sales and operating income, cash flow, CommScope outlook and third-quarter guidance - segment sales, operating income and margins. — Q2 2026 · publ. 29 July 2026 · source ↗
  24. ReportedCommercial air grew 21% organically in the June quarter against 22% reported, so little of that growth was bought.
    Amphenol second-quarter 2026 earnings call transcript (Motley Fool) - end-market shares and growth, CommScope, orders, debt and leverage - end-market shares and growth. — Q2 2026 · publ. August 2026 · source ↗
Sources
Generated September 28, 2026