With U.S. stock futures trading mixed this morning on Tuesday, some of the stocks that may grab investor focus today are as follows:TEN Holdings Inc. (NASDAQ:XHLD) announced a $2.25 million private placement of 991,000 shares at$2.27 per share, according to Benzinga Pro. TEN Holdings shares climbed 17% to $1.65 in after-hours trading.Fonar Corp. (NASDAQ:FONR) shares surged in extended trading hours on Monday after the company announced it signed a definitive agreement for a “take private” sale. Fonar share ...