SEC Form 4 show NAVB Directors made open maket purchases
However, insiders will throw down a miniscule $20,000 of good money for publicity so people who watch them will pick up on it, inflate the price, just in advance of doing a secondary share offering.
Look at the financials - company needs a cash infusion soon. This is simply the precursor.
Maybe this is a way to invest - watch for companies in this space which are running low on cash, insiders begin to make purchase wanting to bid the price up for coming share offering.
However, if $20k is your threshold for insiders making purchases, then you probably want to look at OPK where the CEO has thrown down $millions a week, purchasing shares every day...unfortunately that hasn't helped the stock.
Personally, I have no ownership/interest in this company/stock (seems overvalued with only $345k sales but $250 million valuation) nor OPK (nearly as ridiculous valuation), just commenting on the insider purchase filings which showed up on a report for me this morning.