Shares of National Presto Industries, Inc. (NPK) have declined 0.5% since the company reported earnings for the quarter ended April 5, 2026, compared with a 2.3% gain for the S&P 500 index over the same period. Over the past month, the stock fell 3.1%, underperforming the broader market’s 9.6% advance.National Presto reported first-quarter 2026 earnings per share of 93 cents, which dropped from $1.07 in the prior-year quarter.  Net sales of $118.6 million denoted a 14.5% rise from $103.6 million in the year ...