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This has been a tough week for many of the names on this list and, for some, it's only going to get worse. If you've read my stuff

before, you'll know that I tend to be open-minded on the effects of expiring lockups. In short, it's a mixed bag: Some go down, some go up, some just shrug it off. This week is different. This week, people are scared.

My advice? If you are nursing a painful position in one of these stocks and you need a nudge to move you to sell, the message that a slew of shares may soon be eligible for sale may be enough to sway you. I say go with it. If you sell and the stock gets worse, you win. If the stock turns around and shows signs of improving strength, you can always buy it back.

Whatever you do, being aware of events like impending lockup expirations will make you a more critical investor. It may also save you some money.

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Let's take a look:

* Lockup expirations may be extended or modified by a pending secondary stock offering.

Ben Holmes is the founder of

ipoPros.com , a Boulder, Colo.-based research boutique (now a wholly-owned subsidiary of TheStreet.com) specializing in the analysis of equity syndicate offerings. This column is not meant as investment advice; it is instead meant to provide insight into the methods of new and secondary offerings. Neither Holmes nor his firm has entered indications of interest in any of the companies discussed in this column. Holmes' This Week in IPOs column appears Sundays, This Week's Secondaries appears Tuesdays, Upcoming Lockup Expirations appears Wednesdays and The Quiet Period appears on Fridays. Under no circumstances does the information in this column represent a recommendation to buy or sell stocks. Holmes appreciates your feedback at

bholmes@thestreet.com.