According to this WSJ article, the index was down 20% using intraday levels in Oct 2011:
https://www.wsj.com/articles/calling-bull-on-the-longest-bull-market-1534940689
Calling Bull on the Longest Bull Market
https://www.wsj.com/articles/calling-bull-on-the-longest-bull-market-1534940689
Calling Bull on the Longest Bull Market
"The S&P 500 itself fell 19.4% from its postcrisis closing high to the closing low of October 2011, although even here we can split hairs. Use intraday highs and lows and the index was down 21.6%, for a new bear market. Certainly to many investors it felt like a renewed panic, and nothing like a bull market.
Whether today marks a record is open to doubt either way. Based on closing prices, there was no bear market from 1987 until 2000 in the S&P 500, making that by far the longest bull run. Based on intraday prices, there were bear markets in 1990 and 1998, but that run was still longer than the run since 2011."
Whether today marks a record is open to doubt either way. Based on closing prices, there was no bear market from 1987 until 2000 in the S&P 500, making that by far the longest bull run. Based on intraday prices, there were bear markets in 1990 and 1998, but that run was still longer than the run since 2011."