The leading assignee in this dataset holds 307 of the 5,239 records in scope, with the second through fifth-ranked companies trailing behind it down to 136 at fifth place. That leadership does not amount to control of the field: the top five combined account for only 21.5% of all records, and the top ten reach 31.7%. The remaining two-thirds plus of filings are spread across a long tail of companies each holding a much smaller share, so competitive mapping needs to look well beyond the largest names.

Filings peaked at 279 in 2019, then declined to 257 by 2021 and to 165 by 2024, a 36% drop over that three-year span. That decline covers the most recent years that can be treated as complete, since publication lags filing by roughly 18 months. The 2025 and 2026 counts in the raw data will look even lower, but that reflects the publication backlog rather than a further collapse in real filing activity, so they should not be read as continuing the downward trend on their own.

H01L, covering semiconductor devices, appears in 58.9% of the 5,239 records and is by far the largest single class. H10W and H05K (printed circuits and assemblies) follow at 34.5% and 30.0% respectively, meaning most packaging filings touch at least one of these three areas. Smaller classes, including connectors (H01R), general semiconductor devices (H10D) and magnetics (H01F), each cover under 7% of records, marking them as narrower but potentially less contested claim spaces.