The S&P 500 boasted a record closing high and its seventh straight session of gains on Thursday while the Nasdaq was boosted by such high-profile stocks as Tesla Inc. and Microsoft Corp. but a tumble in IBM shares weighed on the Dow. After hitting an intraday record the previous day the Dow was in the red for most of Thursday’s session as IBM fell 9.6 percent after missing Wall Street estimates for quarterly revenue as orders in one business segment declined ahead of a spinoff next month. Among the S&P’s 11 major sectors, the biggest boost for the benchmark came from consumer discretionary stocks and the technology index, while energy stocks were the biggest drag as crude oil futures fell on concerns about demand. “For the most part you’re dealing with a slightly risk-off day with people going back to more defensive sectors” including big technology companies, said Chris Zaccarelli, …