10%
Thomas W. Powell is a prominent corporate insider and 10% owner of Powell Industries, Inc. (POWL), a Houston-based company founded in 1947 that specializes in the design, manufacture, and service of custom-engineered electrical power products such as power control rooms, switchgear, circuit breakers, and motor control centers.[[2]](https://robinhood.com/us/en/stocks/POWL/)[[3]](https://www.gurufocus.com/insider/64092/thomas-w-powell)[[5]](https://finviz.com/quote.ashx?t=POWL) As of recent SEC filings, he directly holds 650,472 shares, with indirect ownership of 1,623,328 shares through TWP Holdings and 4,000 shares held by his spouse, Kimberly R. Powell, contributing to a substantial stake estimated at over $1.2 billion prior to recent transactions.[[1]](https://www.investing.com/news/insider-trading-news/powell-thomas-w-sells-powl-stock-worth-828905-93CH-4530387)[[3]](https://www.gurufocus.com/insider/64092/thomas-w-powell)[[4]](https://www.stocktitan.net/sec-filings/POWL/form-4-powell-industries-inc-insider-trading-activity-73e8eaf1e7ba.html)
Powell has a history of active involvement with Powell Industries, previously serving as director, President, and CEO, as indicated in past ownership reports.[[3]](https://www.gurufocus.com/insider/64092/thomas-w-powell) On February 24-25, 2026, he sold 1,479 shares at prices ranging from $560.30 to $563.65, totaling $828,905, part of a pattern of 15 sells and 1 buy over the past five years amid the company's strong performance, including a 222% stock return over the prior year.[[1]](https://www.investing.com/news/insider-trading-news/powell-thomas-w-sells-powl-stock-worth-828905-93CH-4530387)[[3]](https://www.gurufocus.com/insider/64092/thomas-w-powell) His career highlights include significant insider trading activity and maintaining a major ownership position in the firm.[[3]](https://www.gurufocus.com/insider/64092/thomas-w-powell)
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