They filed a 13D and reported a 1.24M shares or 5.4% of outstanding shares.
If you are not familiar with Flatbush, let me just tell you that they buy huge stakes in a single company, 15-20%, and sell it for 200% in two years time.
You can check their filing on the Nasdaq web site. Also, check their holdings... Only one holding, MODN.
Couple of years ago,they bought 15% of Retalix, an Israeli software company for an average price of $12.
18 months later Retalix was sold for $30 cash to NCR.
They learn the company inside out and take a single position. My guess is that they increased their holdings in Model N significantly and we should see another filing soon.