NEW YORK (

TheStreet

) -- Activist investor

Carl Icahn stepped up exposure to tech stocks during the third quarter, even as he wages multiple takeover battles, according to latest regulatory filings with the

Securities and Exchange Commission

.

Icahn bought

Mattel

(MAT) - Get Report

,

Dynegy

(DYN)

,

Commercial Metal

(CMC) - Get Report

and tech company

Cadence Design

(CDNS) - Get Report

.

He sold

Anadarko Petroleum

(APC) - Get Report

,

Yahoo!

(YHOO)

,

Micros Systems

(MCRS)

,

Smith & Wesson

(SWHC)

,

Ensco

(ESV)

,

Wendy's/Arby's

(WEN) - Get Report

and

Blockbuster

(BLOKA.A)

He added to his stakes in

Motorola

( MOT),

Chesapeake Energy

(CHK) - Get Report

,

Lawson Software

( LWSN),

Lionsgate

(LGF)

,

Take-Two Interactive

(TTWO) - Get Report

and

Mentor Graphics

(MENT)

.

Motorola,

Genzyme

( GENZ) and

Biogen

(BIIB) - Get Report

are still among his top holdings.

>>View Carl Icahn's Portfolio

Icahn bought 9.6 million shares in energy company Dynegy during the third quarter as part of his efforts to oppose

Blackstone's

(BX) - Get Report

$4.50 a share takeover bid, which he has argued is too low. Most recently,

he offered a $2 billion credit line to Dynegy to allay fears that it may face a liquidity crisis should the takeover bid fail and urged shareholders to vote against acceptance of the deal. Both Dynegy and Blackstone have vehemently opposed Icahn's arguments ahead of a crucial shareholder vote on Nov. 18.

Icahn has also launched a takeover bid for Lionsgate while attempting to orchestrate a buyout of MGM Studios by the former in the process.

MGM recently filed for bankruptcy and

Lionsgate is still said to be in talks with Icahn regarding the takeover..

Investors managing over $100 million assets are required to report their holdings every quarter in a 13F filing within 45 days from the end of the quarter. The managers do not need to disclose short positions or investments in non-U.S. listed securities.

--Written by Shanthi Venkataraman in New York

>To contact the writer of this article, click here:

Shanthi Venkataraman

.

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.

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.

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