BOSTON (TheStreet) -- Paulson & Co. founder John Paulson wants to put 2011 behind him, given the huge losses his hedge fund amassed. The billionaire investor is seeking to rebound from an atrocious performance with new investments in companies including Delphi Automotive (DLPH) - Get Delphi Technologies Plc Report and United Rentals (URI) - Get United Rentals, Inc. Report.

After earning a record $5 billion for a hedge fund manager with the help of gold and bank stocks, Paulson is now slashing some of those holdings to reduce exposure. His flagship Advantage Plus Fund plummeted 51% last year, according to several media reports that cite investors in the fund.

John Paulson (Paulson & Co.)

Last July, Paulson announced during an investor call that he was reducing his net long exposure to 60% from 81% previously, according to a

Reuters

report, with the hedge fund manager saying he "cannot operate the fund at level. I'd like to bring the risk down further to about 50%." He admitted he was "too aggressive" with some stock bets, the report said.

Paulson took part in some dramatic sales during the fourth quarter, unloading his entire position in stocks like

Citigroup

(C) - Get Citigroup Inc. Report

,

Bank of America

(BAC) - Get Bank of America Corp Report

and

Hewlett-Packard

(HPQ) - Get HP Inc. (HPQ) Report

, among others.

Hedge fund and investment managers who manage more than $100 million are required to disclose their equity holdings, options and convertible debt on a Form 13F filed to the

Securities and Exchange Commission

within 45 days of the end of a quarter. Funds aren't required to report short positions betting on declines. Paulson ended the third quarter with 69 reported holdings with a market value of $13.8 billion.

>>View John Paulson's Portfolio

Among other sales, Paulson slashed his holding in the

SPDR Gold Trust ETF

(GLD) - Get SPDR Gold Trust Report

, dropping his position by almost 3 million shares to 17.3 million. The gold ETF still remains as Paulson's largest disclosed holding with a market value of $2.6 billion as of Dec. 31.

Paulson & Co. also cut its holdings in stocks like

Transocean

(RIG) - Get Transocean Ltd. Report

,

Wells Fargo

(WFC) - Get Wells Fargo & Company Report

,

Capital One

(COF) - Get Capital One Financial Corporation Report

and

SunTrust Banks

(STI) - Get SunTrust Banks, Inc. Report

, among others.

Paulson wasn't selling everything in his portfolio. The embattled fund manager increased his stake in 10 companies, including several gold-related companies like

Randgold Resources

(GOLD) - Get Barrick Gold Corporation Report

,

TheStreet Recommends

Iamgold

(IAG) - Get IAMGOLD Corporation Report

and

Barrick Gold

(ABX)

.

Most of Paulson's buys, meanwhile, were M&A targets, some of which have already been gobbled up by buyers. Paulson initiated new stakes during the quarter in

Pharmasset

(VRUS)

and

El Paso

(EP)

while he boosted established positions in

Motorola Mobility

(MMI) - Get Marcus & Millichap, Inc. Report

and

Goodrich

(GR)

.

Two of Paulson's other new stakes were in Delphi Automotive, which went public again in November, and United Rentals, which announced in November that it would merge with

RSC Holdings

(RRR) - Get Red Rock Resorts, Inc. Class A Report

. Paulson's stake in Delphi was about 15.7% of shares outstanding as of Dec. 31 with a market value of $1.1 billion, making it Paulson's third largest disclosed holding.

Perhaps most notably, Paulson sold 1.4 million shares of

Hartford Financial

(HIG) - Get Hartford Financial Services Group, Inc. (HIG) Report

, his portfolio's fifth largest holding with a market value of $608 million as of Dec. 31. The stake is worth 8% of Hartford's outstanding shares, and Paulson is going hostile in order to have the financial company unlock value.

After confronting Hartford CEO Liam McGee on the company's recent earnings call,

Paulson penned a letter to McGee

calling for the company to spin off its property and casual business.

-- Written by Robert Holmes in Boston

.

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