Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Efficient markets hypothesis and performance of IPO shares after lock-up period
That's the way the markets work in THEORY. In actual fact, markets are subject to "real world" pressures. That is, there are so many things going on in the market that the end of the "Lined In" lock up is just one of many. To produce the result you describe, traders would have to hold cash in reserve for this so-called "contingency" to buy at the end of the lock-up. In most cases, they wouldn't want to because of everything else that is going on.  To use a real world analogy, would you want to wait until the last possible moment before going to the bathroom? Or would you go now while you had the chance? That's what the decision about "holding cash in reserve for a contingency" is like.