It seemed like a brilliant move when

Janus Capital

invested $930 million in

Healtheon/WebMD

(HLTH)

in January, paying $62 a share in a private placement. The stock bounced to 71 on the news.

Two months later, as Healtheon/WebMD is trading around 33, the purchase looks more bonehead than brilliant. If this could happen to a top-drawer company like Janus, who else is in danger?

In this week's Saturday Screen, Ian McDonald sifts for mutual funds with the highest percentage of assets in private placements, private companies and illiquid stocks.

Also coming Saturday in Personal Finance Focus:

  • Tools of the Trade. Mark Ingebretsen examines four sites that analyze your retirement portfolio, project its future earnings and suggest improvements.
  • Tax Forum. Tracy Byrnes walks you through Schedule C, a form you will come to know and love (not!) if you are self-employed.
  • Options Forum. We'll show you how to use options to play the ups and downs of biotech stocks.
  • Swing Trading. A look at what has been called "daytrading lite." You actually -- gasp -- hold your stocks overnight or even longer.

And, of course, we'll have Jim Cramer, Gary B. Smith and lots more. See you Saturday.