Facebook stock sales make up about 45% of all private company stock trading on SecondMarket, the $250 million online marketplace for trading illiquid assets, PR boss Mark Murphy tells us.
The next closest companies are LinkedIn and Twitter at a combined 25%, followed by Zynga.
So what happens when Facebook IPOs in 2012?
Murphy isn’t worried.
“There will always be a new hot company that comes along,” he says.
The other reason to be optimistic about a soft fallout is that while private company stock trading is Second Market’s fastest growing sector, it only makes up 20% of total revenue.
Still, the Facebook hole is going to be a big one. SecondMarket works with 35 private companies and completed more than $400 million in private company stock transactions last year. Remember, Murphy told us Facebook transactions made up 45% of that figure.
We imagine SharesPost, a Second Market competitor, has to be worried about losing Facebook next year, too.