The day-trading Reddit crowd turned the first quarter of 2021 into one of the wildest periods of stock market mania in modern history. Books — plural — will undoubtedly be dedicated to the topic in years to come.

But after these small-time speculators banded together to drive up dozens of obscure stocks by hundreds or even thousands of percent — and in the process burned a few hedge-fund barons betting on declines — the movement appears to be petering out. An index that tracks 37 of the most popular meme stocks — 37 of the 50 that Robinhood Markets banned clients from trading during the height of the frenzy — is essentially unchanged over the past two months after soaring nearly 150% in January.

Talk to Wall Street veterans and they will tell you that this flat-lining is the beginning of what will be an inexorable move downward in these stocks.