One assignee leads the ranked field with 234 records, noticeably ahead of the rest of the top ten, where the tenth-place holder has 50. The top five combined account for 33.5% of all 2,010 records in scope, and the top ten for 48.1%, meaning a small number of companies control roughly half of all documented filing activity. Beyond that group, the remaining ranked companies file in much smaller numbers, forming a long tail rather than a second tier of comparable size.

Filings peaked in 2021 at 238 records and had fallen to 103 by 2024, a 57% decline over that three-year window. However, because patent publication typically lags filing by around 18 months, the 2025 and 2026 figures in this dataset are still incomplete and should not be read as evidence of an ongoing slowdown. A fairer read is that the field expanded rapidly through the late 2010s and early 2020s and has since settled to a lower but not yet fully visible baseline.

Both terms describe resonators that use a piezoelectric thin film to generate acoustic waves through the bulk of the material rather than along its surface, and in this dataset they are searched together as closely related structural variants. FBAR specifically refers to designs using a suspended membrane or air cavity beneath the piezoelectric stack, while broader BAW terminology also covers solidly-mounted resonator (SMR) variants that use an acoustic reflector stack instead of a cavity. Patent claims in this space frequently address the reflector or membrane structure, the electrode-to-piezoelectric interface, and methods for suppressing spurious modes, all of which show up as classification tags on the underlying records.

The United States receiving office accounts for 1,138 of the tracked records, by far the largest share, followed by China at 298 and Europe (EPO) at 184. WIPO/PCT filings total 169, with Japan at 49 and the United Kingdom at 39. This distribution suggests that companies working on BAW resonator technology still prioritise US filing first, likely reflecting the concentration of RF front-end module customers and litigation exposure in that market.

The IPC composition shows H03H (impedance networks and filters) present on 89.9% of the 2,010 records, meaning the bulk of the field is framed around filter integration. In contrast, classes tied to velocity/acceleration sensing (G01P) and audio transducers (H04R) each sit at only 1.0% of records, and material analysis and testing (G01N) at 4.9%, all of which indicate comparatively thin claim coverage. A structure that combines core BAW resonator elements with one of these adjacent applications, rather than another filter variant, is more likely to find open claim space.