The tracked dataset contains 2,045 published patent records filed between 2015 and the 2026-07-31 cut-off. This covers both fire-suppression approaches (agent volume, water mist, reignition prevention) and immersion-cooling approaches (dielectric fluid, coolant flow, runoff containment) as a combined field. Because publication typically lags filing by around 18 months, the true count for the most recent one to two years will be higher once those applications publish.

The ranking covers 100 companies, with the leading assignee holding 126 records versus 69 for the fifth-ranked and 46 for the tenth-ranked company. The top 5 assignees together account for 23.9% of all 2,045 records, and the top 10 account for 36.3% — meaningful concentration at the top, but with nearly two-thirds of filings spread across a long tail of smaller companies. That structure means a new entrant is not blocked by a single dominant portfolio, though the leader’s claim set is worth reviewing closely.

Filing volume peaked at 323 records in 2022 and has since plateaued: 2021 recorded 251 filings and 2024 recorded 254, a flat +1% across that three-year span. This reads as a maturing field rather than a growing or shrinking one — the foundational implementations have largely been filed, and newer filings are likely narrower or defensive in scope. Figures for 2025 and 2026 are still incomplete due to publication lag and should not be read as a decline.