Kevin Horner’s Technical Tuesday charts cover the S&P 500 (SPX), Applied Optoelectronics (AAOI), and Seagate (STX). On the SPX, he points to the 6,540 ledge as a recent test area to the downside and discusses where the index could move next. AAOI has had a “fantastic year” and is up another 20% today on good volume. Turning to STX, he discusses support and resistance areas to keep an eye on.