I mean if there's a huge deluge of shares coming available for trading on lock up expiry date then that's can be taken as a pretty bearish sign that employee's don't like where the company is going.
Are employee's going to be scrambling to cash out on the first day or are they gong to hold onto their shares because they feel they'll be worth much more in the future?
SNAP did just start having options trading for it so that should help a bit to relieve the short pressure.
> Traders also own more bearish put options than bullish call options, with put open interest being about 70 percent larger than the number of calls outstanding Wednesday, data compiled by Bloomberg show.
This actually seems just as important as the short exposure.
EDIT Just so I don't sound like a heartless ass.... No one is saying employee's should sell stock and diversify, that's just prudent.
But there is a huge difference from employees selling 20% of their holdings vs 50%+ on the very first day/week they are allowed to sell.