Pentair plc

Pentair plc is an S&P 500 water-technology company that designs, manufactures, and services equipment used to move, treat, and enjoy water, generating $4.18 billion in revenue in fiscal 2025. Incorporated in Ireland and tax-resident in the United Kingdom, the company operates through three segments — Flow, Water Solutions, and Pool — serving residential, commercial, and industrial customers from a base of roughly 9,000 employees.

Pentair's story over the past three years is less about what it sells than about how it sells it. A sweeping Transformation Program built on 80/20 principles has lifted adjusted return on sales from roughly 21% to a record 25.2%, with sixteen consecutive quarters of margin expansion heading into 2026. The central question for the file is whether that expansion can continue once the easy complexity reduction is done — and whether a stock trading more than 10% below its 52-week high is pricing a return to earth or an opportunity to buy a disciplined compounder at a discount.

This report examines the company's pivot from a conglomerate that bought and divested businesses every few years to a focused water platform running a continuous-improvement playbook. The tension is between a management team with a credible track record of operational improvement and a demand environment — particularly in Pool's consumer-facing end markets — that may not cooperate.