Barron's recently ran an interesting story on an activist hedge fund we follow called The Chilren's Investment Fund. The article interviewed founder Christopher Hohn, who unveiled some very interesting points and gave unparalleled insight into one of the most profound activist hedge funds in today's markets.

Hohn acts very similar to Warren Buffett in that he purchases hard-asset companies that are well-positioned and enjoy a near-monopoly, where there is a high barrier to entry, and which are under-researched and undervalued. The difference is that this investor likes to look for situations where poor management is undervaluing the firm.

The Children's Fund is well known for pushing management to pursue shareholder-friendly activities like share buybacks and special dividends designed to unlock value. Indeed, he has also seen great success by saving companies like Deutsche Borse from bad takeover attempts that undervalue the company.

Another important question answered in the interview was how such an innocent name - The Children's Fund - was assigned to such an aggressive hedge fund. It turns out that Hohn's wife wanted a fund that could help the poor, so this fund donates a portion of its profits to a non-profit organization that helps children in developing nations.

The rest of the interview can be read here.

But the big question is then: What stocks does the Chilren's Investment Fund own now? A quick look at their recent Schedule 13F-HR filing with the SEC shows a portfolio of just nine stocks - some popular and some unknown. The hedge fund's largest holding - not surprisingly - is in Union Pacific Corp., while CSX Corporation comes in second place. However, there are also many unknown names like Martin Marietta Matls on the list.

Here is the complete list:
1. Transalta Corporation (TAC)
2. Sterlite Inds India Ltd (SLT)
3. CSX Corporation (CSX)
4. CME Group, Inc. (CME)
5. Martin Marietta Matls Inc. (MLM)
6. Mastercard Inc. (MA)
7. Nymex Holdings Inc. (NMX)
8. Union Pacific Corp. (UNP)
9. Vulcan Materials Co. (VMC)

Yahoo Inc. (NDAQ: YHOO) has bigger problems than Microsoft Corporation (NDAQ: MSFT) these days. The search giant is now trying to fend off activist investor Carl Icahn who has began his own campaign to force the Microsoft deal. So, what does Yahoo plan to do? Delay the inevitable of course! The company decided to put off its annual shareholders meeting until the end of July to give it more time to think.

Yahoo CEO Jerry Yang will now have to work to prove that he can win back investors after rejecting an offer from Microsoft. If not, Carl Icahn has promised a proxy battle to takeover the board and force an acquisition by Microsoft in order to unlock shareholder value. Currently, Yahoo shares are trading 17% below Microsoft's latest $33 per share takeover offer. However, Microsoft did say that it was pursuing a new transaction with Yahoo that didn't involve a takeover, but that it would reconsider a Yahoo bid at some point.

Icahn also has widespread support for his plans to force a Microsoft bid. He owns 10 million shares himself and has an option to purchase an additional 49 million. Furthermore, he has won support from investors including New York hedge fund Paulson & Co., BP Capital LLC Chairman T. Boone Pickens and Third Point LLC's Daniel Loeb. This represents a substantial amount of outstanding shares that would nearly guarantee a successful acquisition.

Meanwhile, Google is continuing is smear campaign against the merger. Larry Page came out saying that the combination would harm innovation by giving the combined company too much control over web communications. All of this complaining may pique the interest of anti-trust judges that are already on shaky grounds with Microsoft after their battle back in the late 90s and early new millennium.

In the end, the Microsoft buyout represents a huge premium for Yahoo shareholders that could take years to realize as an independent company. As a result, Carl Icahn and many others are pushing towards a sale. Whether or not Jerry Yang can successfully convince the rest that independence is the best route remains to be seen. But this stock is definitely one worth watching over the next few months!

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Google Inc. (GOOG)
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The soaring price of oil may be hitting the airline industry hard, but some airlines are starting to take actions that they may regret. American Airlines (NYSE: AMR) is one such airline that recently decided to start charging $15 for the FIRST check-in bag and eliminate about 12 percent of its flights by the end of the year. These moves put American at the forefront of a growing tide of resentment by customers.

Most U.S. carriers are already charging customers $25 for their second checked bag, breaking a longstanding policy of allowing two checked bags for free. Meanwhile, six airlines are raising the cost of checking a third bag to a whopping $100! These fees come at a time when airlines are still facing a growing number of lost baggage (note: there are no refunds of your fee for lost baggage either).

Southwest remains the only major U.S.carrier to allow travelers to continue to check two pieces of luggage without charge. Previously, these customers have been able to check three, but now the airline has begun to charge $25 for the third piece of luggage. Ironically, Southwest is also one of the few airlines that (at least for now) remains profitable.

In the end, soaring jet fuel prices in the United States have made it extremely expensive for airlines to operate. However, taking measures to alienate customers may not be the best way to recoup costs. Rather, simple increases in fare prices to those by other airlines may be the best option.

Shares of AMR Corporation jumped more than 10% on the news today as investors are hoping that the move will provide a short-term turnaround.

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Southwest Airlines (LUV)
Delta Airlines (DAL)