William H Gates III has bought stock on 8 days since Aug 2017

Gates William H III is William H. “Bill” Gates III, a person and prominent corporate insider of Ecolab Inc. through his investment vehicle Cascade Investment, L.L.C.( As the sole member of Cascade, Gates is deemed the beneficial owner of all Ecolab common stock held by Cascade, making him a major shareholder and more than 10% owner of the company.( He has executed significant Ecolab trades disclosed in SEC filings, including multi‑million‑dollar transactions in recent years, and is listed as Ecolab’s largest individual shareholder with tens of millions of shares representing over 20% of the company.(

Beyond his Ecolab stake, Gates is best known as the co‑founder and former CEO of Microsoft Corporation, where he helped build one of the world’s largest software companies and played a central role in the development and global adoption of the Windows operating system.( He later transitioned from full‑time leadership at Microsoft to focus on philanthropy and investment management through the Bill & Melinda Gates Foundation and Cascade Investment.( Gates earned his undergraduate education at Harvard University, where he studied before leaving to start Microsoft, and he now oversees a diversified portfolio of non‑Microsoft investments, including Ecolab, through his chief investment officer and Cascade business manager, Michael Larson.(

Written by Perplexity from public sources.