Private equity firm Apollo Management raised $239.4 million in an IPO for its portfolio company, Metals USA Holdings Corp. (MUSA). The offering came to $20 per share, which was at the top of the $18 to $20 range. In all, Apollo has realized a tidy 266% return on its investment (since 2005).

This was good news for Apollo, which just this week had to scrap its $2.4 billion deal for Cedar Fair (FUN).

Before going private in 2007, Aeroflex Holding had been a public company for 46 years. Well, now the company has filed for an IPO, planning to raise up to $500 million.

Aeroflex develops radio frequency and microwave circuits and components. The primary focus is on demanding applications, such as for space, avionics, defense and medical. As a result, the margins are fairly high.

Even for top private equity firms, it's extremely tough to raise new funds. Investors are changing their allocations and also concerned about future returns. For example, private equity firms raised only $13 billion in Q1, which was the lowest since 2004. The peak came in Q1 of 2008, when the amount was roughly $68 billion.

As a result, private equity firms need to get creative, such as focusing on new markets.

Even with the rebound in the economy, the problems at Zale (ZLC) continue. The jewelry chain has posted a string of losses over the past couple years and is having liquidity issues. Keep in mind that the company recently indicated that there may not be enough cash flow to meet the operating needs for 2010.

So to deal with the situation, Zale hired investment bank, Peter J. Solomon, which has a strong background in turnarounds.

While the past couple years have been tough for private equity firms, the problems at Cerberus Capital Management have been quite painful. After all, the firm got crushed on investments in companies like GMAC and Chrysler.

But this does not mean everything has been bad. For example, Cerberus has filed for a $100 million IPO of Tower Automotive.

For alternative asset managers, the financial results can be complex and volatile. Just look at the Blackstone Group's (BX) latest quarterly results. Revenues came to $725.3 million, which compares to negative revenues of $611.3 million in the same period a year ago. Adjusted earnings were $329.4 million, or $0.29 per share, which is up from a loss of $763.8 million, or $0.68 per share.

Of course, these results also reflect the brutal impact of the credit crunch.

Even thought its more than 30 years old, Express continues to be a relevant specialty fashion retailer. In fact, it is ranked the number six player in the U.S., with 573 stores.

So this week, Express filed to go public. The company expects to raise $200 million.

Express focuses on a tough demographic; that is, women and men between the ages of 20 and 30. Yes, this is part of the so-called Gen Y crowd, which can be fickle. But it is also a large market and will continue to grow.

When it comes to snowplows and salt spreaders for light trucks, Douglas Dynamics has top-notch brands in the industry. They include Western, Fisher and Blizzard.

Now, Douglas has filed to go public. The estimated size of the offering is about $150 million.

For a mega private equity firm like Blackstone (BX), there's a need to get liquidity on a mega scale. So this week, the firm prepared for one of its holdings, Travelport, to go public. The deal could be worth as much as $3 billion.

Blackstone will float the deal on the London Stock Exchange. There will also be the issuance of 7.2% of the stock to Government of Singapore Investment Corp. (for about $225 million).

A new book, The Prince of Silicon Valley, chronicles the dealmaking of the IPO king of the 1990s: Frank Quattrone. He made a fortune as he helped more than 100 tech companies go public, which included marquee names like Cisco (CSCO), Netscape and Amazon.com (AMZN).

But those days seem quaint. In fact, the tech IPO market has been a backwater for the past decade, even though there have been some big deals -- like the offerings of Google (GOOG) and Salesforce.com (CRM).

The Blackstone Group (BX) is one of the world's largest private equity real estate investors, with a global portfolio of $23.7 billion. The firm also has extensive hotel holdings. Some of the brands include Hilton, La Quinta, Waldorf-Astoria, Boca Raton Resort & Club and the Trianon Palace Versailles.

In fact, as financing warms up -- and valuations remain attractive -- Blackstone is starting the year by boosting its holdings. According to a report in the Wall Street Journal (subscription required), the firm is angling to control Highland Hospitality. This was done by making a clever purchase of outstanding debt from Wachovia.

A few years ago, SS&C Technologies had some bad timing. The company attempted to pull off an IPO. However, because of the global financial crisis, the offering had to be pulled.

Well, as the markets have since improved, SS&C Technologies is taking another try. This week, the company refiled for an IPO.

For the most part, it's been an awful year for private-equity buyouts. Debt financing remains tight and there are still disagreements on valuations.

Instead, the dealmaking has been mostly on the small side. In fact, just look at this week's buyout for Amicas (AMCS). Thoma Bravo LLC has agreed to pay $217 million for the company.

While there was an uptick in the IPO market during the past couple months, it looks like things are cooling down. It seems that investors are holding off from riskier investments until next year.

Unfortunately, this is not good news for Team Health Holdings (TMH), which launched its IPO Wednesday. The company planned to issue 20 million shares at a range of $14 to $16. Instead, Team Health was only able to fetch $12 each for 13.3 million shares. The stock price was up 43 cents in morning trading.

Traditionally, the role of private equity is to buy mature companies and find ways to improve the operations. The result is often a tidy profit.

But over the past couple years, the strategy has been undergoing some changes. Look at the Carlyle Group. Recently, the firm invested $60 million in three growth companies in China. In fact, these deals came only four months after Carlyle raised its Asia Growth Partners IV fund.