The ranking in this dataset shows a single assignee well ahead of the rest, holding 1,537 of the 25,071 records in scope compared with 337 at fifth place and 222 at tenth. The top five assignees combined hold 21.3% of all records, and the top ten hold 26.6%, which means the remaining roughly three-quarters of filings are spread across a long tail of other companies rather than concentrated among a handful of leaders. Anyone doing freedom-to-operate work should still check the leader’s portfolio closely, but should not assume the field is a two- or three-company market.

Filing volume peaked at 2,096 records in 2022 and fell to 1,424 by 2024, a -31% change from 2021’s 2,058 filings, which is a genuine cooling over that three-year window. However, publication lag of roughly 18 months means the 2025 and 2026 figures in any dataset will look artificially low simply because those applications have not all published yet, so it is not yet possible to say whether the cooling continues past 2024. Treat any 2025-2026 numbers as provisional rather than evidence of a further decline.

Beyond the core gyroscope and navigation class (G01C, 8.3% of records), the largest overlapping areas are digital data processing (G06F, 13.3%), radar/sonar/positioning (G01S, 12.1%) and wireless communications (H04W, 11.8%). This shows the field has shifted toward processing and connectivity claims layered on top of the physical sensing element, which matters for drafting: a claim that only covers the sensor hardware competes in a smaller slice of the art than one that also reaches the data-fusion or transmission layer.