With U.S. stock futures trading mixed this morning on Tuesday, some of the stocks that may grab investor focus today are as follows:Wall Street expects Ferguson Enterprises Inc. FERG to report quarterly earnings at $2.88 per share on revenue of$8.41 billion before the opening bell, according to data from Benzinga Pro. Ferguson shares gained 0.6% to $215.87 in after-hours trading.Adtran Holdings Inc. ADTN announced a$150 million convertible senior notes offering. Adtran shares dipped 10% to $9.40 in the af ...