Billionaire Leon Cooperman is retired but is still investing. (Just like plenty of other retirees! Once you retire, you might have several decades ahead of you, so keeping at least a portion of your portfolio in stocks makes sense.)

Those who follow billionaires and their investments may be curious about where Mr. Cooperman has parked his money. It's easy to find answers at sites such as WhaleWisdom.com, where I looked up Cooperman's holdings.

Someone with arms crossed is smiling.

Image source: Getty Images.

Here are his recent top five holdings:

1. Mr. Cooper Group

The Mr. Cooper Group traces its roots way back to 1889 and is a specialist in home loan services. With a recent market value of nearly $6.6 billion, it has averaged impressive annualized gains of 14.8% over the past 15 years.

2. Vertiv Holdings

Vertiv Holdings specializes in digital infrastructure technologies, such as power management systems and thermal management systems. With a recent market value of $51 billion, it has averaged annual gains of 64% over the past five years and has a promising future.

3. Energy Transfer LP

Energy Transfer LP owns a major pipeline network and specializes in moving and storing natural gas, crude oil, and more. With a recent market value of $69 billion, it has averaged annual gains of 10% over the past 15 years. Energy Transfer has been spending heavily on opportunities to grow. The stock soared in 2024 and can still go higher.

4. Apollo Group Management

Apollo Group Management is a private equity and insurance hybrid firm with a recent market value of $94 billion. It has averaged annual gains of nearly 23% over the past decade.

5. WillScot Holdings

WillScot Holdings specializes in workspace and portable storage solutions. With a recent market value of $6.7 billion, it has averaged annual gains of 14% over the past 10 years. It seems appealingly valued, too, with a recent forward-looking price-to-earnings ratio of 21.5, well below its five-year average of 25.8.

If any of these businesses intrigue you, take a closer look.