Among today’s S&P 500 members, 84% of the 856 times a stock closed 50% or more below its high since 2000 it later got back to that high, but only 49.2% of the 772 episodes with three years of follow‑up did so within three years, and that count leaves out the companies that never came back. That is Exent’s count on dividend‑adjusted daily closes from Jan 3, 2000 to Oct 27, 2026, for 499 current members.
The 84% is not a probability for your stock. The sample is today’s index, so every stock in it is a company that survived and grew big enough to be in the S&P 500 in 2026. Companies that fell 50% and then went bankrupt or were dropped from the index are missing. Enron (bankrupt in 2001), WorldCom (2002) and Lehman Brothers (2008) all fell far more than 50% and never recovered; none of them is in this count. Because they are left out, this sample overstates how often a stock that falls 50% gets back, and it cannot estimate the odds for one stock or for all stocks.
Even among survivors, a 50% fall is common, not rare: 444 of the 499 members (89%) had at least one since 2000. A 50% loss needs a 100% gain to get back to even, which is why the wait is often long. The arithmetic is in loss recovery math.