By David Benoit and Emily Glazer 
 

After a bruising second quarter, William Ackman has taken a moment to reflect.

In a 20-page letter to investors reviewed by the Wall Street Journal, Mr. Ackman acknowledged that he has made mistakes, notably in his investment in retailer J.C. Penney & Co. (JCP), as well as Borders Group Inc. and Target Corp (TGT).

"Clearly, retail has not been our strong suit," Mr. Ackman wrote to Pershing Square Capital Management L.P. investors.

But Mr. Ackman remained defiant about the firm's investment in Herbalife Ltd. (HLF), a nutritional supplement maker.

The letter noted that Pershing funds were "flat" in the second quarter and stepped back to look broadly at Pershing Square's investment track record, declaring that in sum, "our successes vastly overwhelm our failures."

The letter also touched on other investments, stating Pershing Square has sold a portion of shares in Procter & Gamble Co. (PG) in order to help fund its new position in Air Products & Chemicals Inc. (APD). Mr. Ackman said Pershing Square will engage with Air Product's management and board and is in the initial stages of those engagements.

On J.C. Penney:

Mr. Ackman said he may eventually sell his 17.7% stake in J.C. Penney.

"We may choose to exit J.C. Penney after more or less time depending on developments at the company, the stock price, and the availability of other investment opportunities."

The stock slid Wednesday, down 3.4% to $13.54.

Pershing Square first took a position in J.C. Penney in August 2010, when shares were trading north of $19. Following a management change and a year of slumping sales, J.C. Penney changed chief executives again earlier this year. Mr. Ackman this month pushed for another change, including taking the unusual tact for a board member of releasing public letters. He ultimately resigned from the board, with an agreement that two additional directors would be named. He reiterated that Pershing Square has "the contractual right" to appoint an additional director to the board. The company disclosed last week an agreement with Pershing Square that would control how any shares would be sold by the investor.

In the investor letter, Mr. Ackman said he released the letters because he believed it was his "fiduciary duty" and as a way to protect Pershing Square's investment.

On Herbalife:

Pershing Square is facing large paper losses on a $1 billion bet that the stock price would fall as the nutritional company has received investor support from such names as Carl Icahn and George Soros and shares have risen more than 95% this year.

Mr. Ackman has accused the company of being a pyramid scheme. The company has denied all charges and fired back that he is manipulating shares.

"We believe that Herbalife was a good short sale at our cost, and an even better one at current values and in light of recent developments," Mr. Ackman wrote. "Our batting average on our active long investments is 16 out of 19, or 84%, and 4 out of 5, or 80%, on the short side, with Herbalife in the undecided column."

Mr. Ackman said there are two key ways for Pershing Square's Herbalife short position to work: regulatory intervention or a decline in the number of new independent distributors. He cited new rules the company has since taken, including discouraging loans for distributors, and the departure of some top sellers to other companies.

Write to David Benoit at david.benoit@wsj.com or Emily Glazer at emily.glazer@wsj.com

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