Carl Icahn revealed the size of his stake in VMware Monday.

“I wish I had a bigger position than I have, but it’s a sizable position .. It’s in the hundreds of millions of dollars, but it could be more but the stock just got away from me,” he said on CNBC’s “Halftime Report” Monday. “I added to the position. I also bought the tracking stock [Dell Technologies Inc Class V] too, which I don’t think was mentioned.”

CNBC reported in April Icahn acquired a “medium-sized” stake in VMware, according to sources familiar with the matter.

Icahn broached the prospect of facing off with Dell founder Michael Dell again.

“We’re right there against Dell again, maybe,” he said. “I say maybe because I hope he does the right thing and he pays a fair price for it.”

Icahn publicly and unsuccessfully challenged Michael Dell in his 2013 effort to take Dell private. Michael Dell and Silver Lake ultimately acquired the company for $24.4 billion, a price tag Icahn said “greatly undervalues it.”

The billionaire investor is chairman of Icahn Enterprises. He often targets struggling companies as an activist to bring about changes to improve their businesses and boost their stock market values.

—CNBC’s Alex Sherman contributed to this report.