Sometimes the stock market makes perfect sense, and sometimes a stock decides to go its own direction entirely. Wednesday was one of those days for Strategy Inc Common Stock Class A (MSTR), which surged even as the broader market took a breather. The S&P 500 slipped 0.38% and the Nasdaq fell 0.53%, but Strategy shares? They had other plans.

So what's driving this rally while everything else is sliding sideways?

An Insider Decides It's Time to Buy

Here's something you don't see every day: a company director actually buying shares with his own money. Carl Rickertsen, a Strategy director, just picked up 5,000 shares for roughly $779,395. That works out to an average price of $155.88 per share, right in the middle of Monday's trading range.

What makes this purchase interesting isn't just the size, but the timing. This marks Rickertsen's first open-market buy in more than three and a half years. Before this, he'd been consistently offloading shares he received through compensation. So why the change of heart? Well, Strategy shares had plummeted about 68% from their highs of $457, and apparently Rickertsen decided that around $156 looked like a decent entry point.

Insider buying doesn't guarantee anything, but when a director who's been selling for years suddenly opens his wallet, people notice.