In early 2001, the California Public Employees’ Retirement System (CalPERS) purchased a 5.5% equity stake in Carlyle for $175 million. It was the first such deal of its kind — an institutional investor buying into an actual private equity firm, rather than just a private equity fund — and valued Carlyle at approximately $3.18 billion. By the middle of 2008, the firm’s value had skyrocketed to nearly $17 billion, according to an annual CalPERS investment report.

That was during the “golden age” of private equity, a term coined by Carlyle’s own David Rubenstein. It was also a high point. Carlyle’s value would drop to $4 billion the following year, and rebound a bit to $6 billion by mid-2010.

CalPERS had just published its most recent investment report, showing a $436 million carrying value for its Carlyle investment through June 30, 2011. That works out  to a valuation of nearly $7.93 billion.

A cynic might read this as Carlyle having lost value over the past year, which isn’t the best directional signal for a pending IPO. But, to me, it seems to be confirmation that Carlyle is intentionally seeking to go public at a discount. Particularly given that it’s in the process of raising a new $10 billion North American buyout fund that should create a brand new pool of recurring management fees. Plus, it’s private equity portfolio has appreciated significantly over the past year, given that it’s required to mark private companies to public market comps.

In fact, David Rubenstein reportedly has told prospective investors that Carlyle is seeking to offer its units at a discount to rivals like Blackstone Group (BX) and Kohlberg Kravis Roberts & Co. (KKR), in order to better create return potential. The CalPERS data seems to confirm that strategy.

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