The ranking covers 100 assignees measured by record count within this scope, with a single leader holding 26 records — well ahead of the fifth-placed assignee at 17. The top five assignees combined account for 19.8% of the 514 records in scope, and the top ten account for 31.7%, so while there is a visible leader, the majority of filings are spread across a long tail of smaller filers rather than concentrated in a handful of firms. Anyone doing freedom-to-operate work should still check the full ranked list rather than assume one company covers the space.

Filings rose from 19 in 2017 to a peak of 45 in 2023, then fell to 17 by 2024, a 32% decline over that three-year span. Because patent publication typically lags filing by around 18 months, the 2025 and 2026 counts in this dataset are still incomplete and should not be read as evidence of an ongoing slowdown. The safest reading is that the field passed through a filing wave that peaked in 2023 and has since settled to a lower but still active rate.

Beyond the G01N material-analysis baseline that defines this search, the largest overlapping IPC classes are G01J (radiation and light measurement), covering 18.7% of the 514 records, and A61B (diagnosis and surgery), covering 16.7%. Smaller but distinct clusters appear in digital data processing, enzyme/DNA-based measurement, AI-based computing, particle/fibre-board sensing and computational chemistry, each between roughly 4.9% and 7.4% of records. Because a single record can carry several IPC codes, these figures add up to more than 100% and should not be treated as mutually exclusive categories.