StockStory favors Kirby, flags Paychex and F5 as profit headwinds persist

StockStory on May 15, 2026, identified Kirby Corp. (NYSE: KEX) as a profitable company with stronger growth prospects while expressing caution on Paychex Inc. (NASDAQ: PAYX) and F5 Inc. (NASDAQ: FFIV), citing concerns that current profitability may not translate into durable performance. Paychex reported a trailing 12-month GAAP operating margin of 36.9% and traded at $93.99, implying about 5 times forward price-to-sales. F5 posted a 24.7% trailing 12-month GAAP operating margin and traded at $361.65, or about 6 times forward price-to-sales. Kirby, a marine transportation company, had a trailing 12-month GAAP operating margin of 14.6% and traded at $146.14, or 19.8 times forward earnings. The report framed Kirby as the more attractive stock among the three, while warning that Paychex and F5 may face growth or competitive pressures despite positive earnings.