pac,
Yes that is the reason.
Because it was the 3rd, and the markets were closed on the 4th, many small stocks lost their bid and ask. Instead of trading in the after hours market, there was no one who kept a bid or ask on it over the holiday. They just left the building, that is all. ON the 5th, when they are back, there will be a bid and ask.
Lots of stocks have no bid or ask on Friday afternoons or on the day before a holiday. At least the small ones.
News 
Market Data 
Discover 
