Filing activity in this dataset is concentrated at the top: the leading assignee alone holds 5,149 of the 24,382 records in scope, and the top 5 of 100 ranked assignees together hold 34.3% of all records. Below the top 5, the count drops sharply — fifth place sits at 619 records and tenth place at 209 — so most of the field sits in a long tail of companies with far smaller filing counts. This pattern is typical of a technology that had an early land-grab phase around a small number of core applications, in this case augmented- and virtual-reality waveguide optics.

Filings peaked at 1,700 in 2020 and have since declined to 1,086 by 2024, a 31% drop over that three-year window. That said, publication typically lags filing by around 18 months, so the 2025 and 2026 figures in any chart are still incomplete and should not be read as evidence the technology itself has plateaued. Recent-year momentum data shows steep year-over-year declines across nearly every major assignee, which points to a cooling filing cycle among the current leaders rather than new entrants failing to appear.

G02B, covering optical elements and systems, appears in 47.9% of all 24,382 records in scope, making it by far the largest IPC subclass in this dataset. Image data processing (G06T), pictorial communication (H04N) and digital data processing (G06F) each cover roughly 10-12% of records, while lighting, positioning and measurement classes each sit around 5-7%. Because a single record can carry multiple IPC classes, these shares add up to more than 100%, and the overlap indicates that many metalens claims extend beyond the optical element itself into system-level image or display functions.