https://www.kitklarenberg.com/p/insider-trading-proves-911-foreknowledge?

Example, among others cited.

Declassified records of one suspicious pre-9/11 trade probed by the FBI sheds potential light on why US and other authorities may have decided to leave the entire issue alone. From September 6th – 10th 2001, a total of 56,000 Stratesec shares were purchased by a single investor. The company provided security systems to several airports, including Wasington DC’s Dulles from where one of the hijacked planes departed, and the World Trade Center. Its share price almost doubled in the attacks’ wake.

The shady trades were traced back to Wirt D. Walker III – a distant relative of the Bush family and business partner of Marvin Bush, then-President George W. Bush’s brother. The FBI reportedly uncovered “no ties to terrorism or other negative information” regarding Walker, so didn’t even interview him before concluding his lucrative transactions were innocent happenstance then closing the investigation. Apparently, the evident possibility Walker III possessed foreknowledge of 9/11 via other means than “ties to terrorism” wasn’t worth exploring.