Charles Schwab's Kevin Horner says technical trends on the SPX indicate a market that "does not want to sell off." He highlights key levels in the index investors should watch. As for Transmedics Group (TMDX), Kevin believes bulls pushing the stock above its 20 and 50-day SMA offer additional levels of support for a higher run. He adds that Oklo Inc. (OKLO) continues to show "bull flags" as it pushes new all-time highs.