Palantir Technologies (NYSE:PLTR) shares fell 3.6% to $140 in premarket trading Tuesday after co-founder Peter Thiel disclosed intentions to offload 2 million shares, valued at roughly $280 million, according to a regulatory filing released late Monday.
Thiel remains one of the five largest shareholders of the defense-focused artificial intelligence software company, based on LSEG data.
If losses persist into the regular session, the decline would snap a four-day winning streak for the stock.
Palantir shares are down more than 18% so far this year, following a surge of over 135% in 2025.
Broader global markets were also under pressure Tuesday, as investors weighed the fallout from U.S. and Israeli military strikes on Iran, which have amplified geopolitical risks worldwide.