"The end of…this…is nigh."

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That's the warning from "The Big Short Investor" Michael Burry, "this" being the stock market's blistering rally to record after record in recent weeks.

Burry said he believes the market could finally be on the edge of the major decline he's been warning about, telling readers of his Substack in an early morning post on Monday that history seems to be repeating itself.

"With what is happening in the market the last week, that I had lived this before suddenly dawned on me," he wrote. "The NASDAQ 100, complete reversal."

The former Scion Asset Management chief pointed to the major rally in recent weeks, with the indexes climbing higher on strong earnings and optimism for a peace deal with Iran, even with no agreement yet in sight.

"I am calling something. The market has jumped the shark," Burry wrote, later speculating that the conflict with Iran, the recent surge in oil prices, or a potential contagion event in private credit could all be triggers to a coming decline.

Burry pointed in particular to the tech and semiconductor sectors, which have been on a tear amid fresh dealmaking and strong earnings over the past month. The iShares Semiconductor ETF is up 65% year-to-date, marking one of its best-ever rallies.

The Nasdaq 100 is up 16% in the last month alone.

In a post last week, Burry flagged an analysis from analysts at BTIG that showed the market, by some metrics, has eclipsed dot-com era moves. According to the analysis, the top 10 performers in the Nasdaq 100 were up an average of 784% over the past year. That compares to the average 622% gain across the top 10 performers in the year leading up to March 2000, the month before the dot-com bubble began to deflate.

The former hedge funder pointed to several charts that showed the "complete reversal" of the major stock indexes following the dot-com bubble and in 1929, labeling each peak with "You are here."

The market environment looks "so familiar" to the months leading up to the dot-com bust, Burry added, suggesting that investors consider selling high-momentum stocks or reducing their exposure to the tech sector.

He added he had taken "significant" leveraged short positions against a portfolio of companies he believed were "depressed and cheap," which is what he had done prior to the market crash in the early 2000s.

"My only thought now, this weekend, today, is to let people know where we are. We are witnessing history. In the stock market, that is not a good thing," Burry said.

Burry acknowledged his reputation as "the boy who cried wolf" in markets, referring to his long history of making bearish calls on the market.

He argued that many of his social media posts in recent memory have been framed by the media as stock-crash warnings, though he wasn't calling for a decline in earnest.

"I am now a meme for the number of times I have called a crash," he said. "Today, however, I am telling."