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If you're looking for the hottest stock of the past half-decade, you might think of Nvidia or some other tech darling. But the real winner is an HVAC company you've probably never heard of: Comfort Systems USA (FIX). It's not just beating the market; it's the top performer in the entire S&P 500 over the last five years.
And here's the kicker: a member of Congress was all in on this stock back in 2020, but he sold too early, leaving millions on the table.
Right now, only two members of Congress own Comfort Systems stock, according to the MarketDash Government Trades page. But back in 2020, Rep. Michael McCaul (R-Texas) was a big buyer.
McCaul didn't just dip his toes in; he bought the stock 68 times in February and March 2020, according to data from Quiver Quantitative. Those trades totaled between $68,000 and $1.02 million.
Then, on March 30, 2020, he sold. Two chunks: one for $50,000 to $100,000, another for $15,000 to $50,000. We don't know if he sold everything or just part, because back then, trades didn't specify "partial" or "full" like they do now.
But here's the painful part: based on the trading volume and a high price of $35.73 per share that day, McCaul sold between 1,819.2 and 4,198.2 shares. Today, that stake would be worth between $3,170,265.26 and $7,316,077.19. Yes, you read that right. His 2020 sale cost him up to $7.3 million in potential profits.
McCaul is no stranger to trading. Quiver Quantitative data shows he's made 29,367 stock trades since 2013, totaling more than $1.5 billion. He's one of the most active traders in Congress, but this one was a costly misstep.
Comfort Systems isn't just a five-year wonder. It also ranked in the top five for the 10-, 15-, and 20-year periods, according to a recent social media post. That kind of long-term performance is probably why two current members of Congress are holding on.
Rep. Byron Donalds (R-Fla.) bought $2,000 to $30,000 in FIX stock on Dec. 4, 2025. Based on a high price of $1,006.60 that day, he's already up 73.1% in eight months.
Sen. Alan Armstrong (R-Okla.) bought $1,000 to $15,000 in FIX stock on March 27, 2026. With a high price of $1,390.90 that day, he's up 25.4% in five months.
So, while McCaul is probably kicking himself, Donalds and Armstrong are enjoying the ride. The lesson? Sometimes, the best move is to hold on tight.
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