Private company
Who owns Aqua Membranes, Inc.
One company in the researched set discloses a stake in Aqua Membranes, Inc., none of it sized by anyone who discloses it. Aqua Membranes, Inc. is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
Aqua Membranes, Inc. - Profile
- Type
- private company
- Based in
- United States
Aqua Membranes makes reverse osmosis membrane elements built around its patented Printed Spacer Technology, a process that prints three dimensional polymer shapes directly onto flat sheet membrane in place of the plastic feed mesh used in conventional spiral wound elements. Removing the mesh opens up the flow channels, which the company says cuts pressure drop and energy use, lengthens the interval between cleanings and raises usable membrane area, and because the elements keep standard dimensions they drop into existing housings without a retrofit. The technology is aimed at industrial and municipal water treatment, desalination and residential and commercial water systems, with the printed pattern tuned to the application. The company is based in Albuquerque, New Mexico and also operates from Knoxville, Tennessee.
Source
Aqua Membranes, Inc. files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from Aqua Membranes company site, Pentair announces equity investment in Aqua Membranes (WaterWorld) and Pentair announces equity investment in Aqua Membranes (Smart Water Magazine). The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- Pentair plc. Exhibit 21 (List of Subsidiaries) to Pentair's FY2025 10-K (filed 24 Feb 2026, 'Pentair plc and subsidiaries as of December 31, 2025') lists Aqua Membranes, Inc. (United States) with footnote (1), and the exhibit's own footnote key states '(1) 10.26% owned'. No dollar value, share count, or acquisition date is given anywhere in the 10-K or 10-Q; the term 'Aqua Membranes' does not appear anywhere in either filing's main body (checked via full-text search), so Exhibit 21 is the sole source for this stake. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Aqua Membranes, Inc. where a holder stated one, and are missing where no holder did.