Billionaire investor and shareholder activist Carl Icahn reported changes in his portfolio Monday, including new positions in

BJ's Wholesale Club

(BJ) - Get BJ's Wholesale Club Holdings, Inc. Report

,

Federated Department Stores

( FD)

Lear

(LEA) - Get Lear Corporation Report

,

Cendant

( CD) and

Lions Gate Entertaintment

(LGF)

.

His hedge fund, Icahn Management, disclosed the changes in its quarterly regulatory filing, which also revealed that he doubled his stake in

Tyco International

(TYC)

and remains heavily invested in

Time Warner

(TWX)

and

TheStreet Recommends

Blockbuster

( BBI).

Icahn has waged several much-publicized proxy battles recently at Time Warner and Blockbuster, with mixed success. His new holdings could signal that new activist campaigns are in the works. Shares of BJ's Wholesale Club, which have run up in recent months amid buyout rumors, were recently up $1.29, or 4.5%, to $30.13 after Icahn disclosed the purchase of about 2.5 million shares.

Shares of Lear, meanwhile, advanced 40 cents, or 1.5%, to $26.49. Icahn bought 2.6 million shares of the auto-parts maker.

Icahn's fund also reported new positions in

Consol Energy

(CNX) - Get CNX Resources Corporation Report

,

Gencorp

(GY)

,

Houston Exploration

( THX) and

Williams Cos.

(WMB) - Get Williams Companies, Inc. Report

Also, the fund reported that it sold its holdings in

Albertson's

(ABS)

and

Massey Energy

( MEE).