With U.S. stock futures trading lower this morning on Tuesday, some of the stocks that may grab investor focus today are as follows: Wall Street expects Donaldson Company, Inc. (NYSE:DCI) to report quarterly earnings at 83 cents per share on revenue of $915.84 million before the opening bell, according to data from Benzinga Pro. Donaldson shares fell 2.4% to close at $71.95 on Monday. HealthEquity, Inc. (NASDAQ:HQY) reported better-than-expected first-quarter financial results. The company reported quarterly ...