What happened

Shares of Scholar Rock Holding (SRRK -1.00%) had jumped by more than 25.8% as of 2:32 p.m. ET on Monday after it disclosed in a financial filing that one of its directors, a venture capital investor named Amir Nashat, had purchased upward of $5.87 million worth of the company's shares on June 22. Nashat also purchased 299,498 of its warrants, which can be exercised at a price of $7.35 through the end of 2025.

So what

The investor is a high-ranking executive at the venture capital group Polaris Partners, which invests in biotechnology businesses like Scholar Rock.

Plus, the shares and warrants are both held by the venture capital firm rather than by Nashat directly, though he does independently own a small number of shares. This means that there is a very good chance the biotech industry experts at Polaris Partners believe that Scholar Rock, which is one of their portfolio companies, is going to do something that makes its share price go way up.

Now what

Scholar Rock is currently running a phase 3 clinical trial investigating whether its candidate called apitegromab is safe and effective for treating spinal muscular atrophy (SMA). For a major investor to double down, it's likely that management is seeing something quite favorable in the interim results. 

But Scholar Rock has kept mum so far, and the trial won't be done until June 2024 at the very earliest. Keep an eye out for any releases about how things are going, as they're likely to bode extremely well for the drug's eventual approval.