Investing.com -- "Big Short" investor Michael Burry said Friday he is maintaining his bearish position against Palantir Technologies, despite a public endorsement from President Donald Trump that lifted the stock earlier Friday.

Burry said in a Substack post that he continues to hold long-dated put options on the artificial intelligence software firm. The investor said he started betting against the company in the fall of 2025 and has repeatedly rolled the position.

"I now own the June 17 2027 Strike Price 50 Puts and the Decembers 19, 2026 Strike Price 100 Puts. I am not selling these today," Burry wrote.

Trump praised Palantir in a Truth Social post Friday, boosting the stock off its intraday lows. The shares were on track for a roughly 13% weekly drop, bringing their 2026 losses to about 28%.

"Palantir Technologies (PLTR) has proven to have great warfighting capabilities and equipment," Trump wrote. "Just ask our enemies!!!"

Burry said the stock has weakened since reaching a peak near $200 last year. While acknowledging the possibility of a near-term rally, Burry said the company's value is less than half of what it's worth now.

"Trump's post rallied the stock after the stock had fallen 18% the last three days. The stock may catch a wind here. It has been selling off with software stocks. As mentioned, I continue to hold the puts, as I believe the fundamental value of this company is well under $50/share," he said. Palantir traded around $127 per share Friday.