This landscape identifies 1,150 published records filed between 2015 and 2026 that combine tangential flow filtration or crossflow filtration terminology with flux, pressure or shear-control language, restricted to relevant separation, bioreactor and genetic-engineering IPC classes. The count includes all publication types captured by the search string, not a curated subset. Because a single invention can generate multiple publications across jurisdictions, family-level counts are the more reliable unit for judging true portfolio size.

The ranking covers 100 companies, with the leading assignee holding 116 records, fifth place at 34, and tenth place at 24 — a steep drop after the top few names. The five leading assignees combined account for 26.8% of all 1,150 records in scope, and the top ten reach 39.3%, meaning a majority of filings still sit outside the most active names. This is a field with an identifiable core group of filers but a long tail of smaller entrants rather than a single dominant gatekeeper.

Filing volume grew substantially from 32 records in 2017 to a peak of 99 in 2023, and the most recent complete comparison shows 2021 and 2024 both at 62 filings — a flat, 0% change over that span rather than a decline. Counts for 2025 and 2026 appear lower only because patent publication typically lags filing by around 18 months, so recent years are still filling in. Reading the latest one or two years as a slowdown would be a misreading of how patent data becomes visible over time.