These CEOs are taking advantage of the market plunge to double down on their own companies

There are no two ways around it: Late August has the stock market in a swoon.

Friday's market plunge made the past week the worst for the Dow since the nadir of the financial crisis.

For some chief executives, that means it's time to buy.

Senior leaders at Lending Club and On Deck Capital, which each saw shares hampered by a recent court decision, have been buyers of company shares this month.

At Twitter, execs that were once dumping stock changed their minds and start buying back in as the company's shares test their original float price.

And Elon Musk doubled down on his electric car maker Tesla, in a big way this week.

Business Insider went through Form 4s filings to come up with a list of the insiders buying company stock in hopes that their market timing will make them a bundle in the long-run.