) --


(NFLX) - Get Report

shares surged as much as 20% after legendary activist investor

Carl Icahn

took a large stake in the movie-streaming and DVD-rental company.

Icahn on Wednesday disclosed in a


with the

Securities and Exchange Commission

he has a 9.9% stake in Netflix, or 4,291,066 shares.

Netflix shares rose sharply in reaction to Icahn's disclosure, jumping 20% before briefly being halted in


trading. Upon resumption of trading late on Wednesday, Netflix shares were up 14% to $79.56. The company's stock has gained over 20% this year, as the news of Icahn's stake is helping to stem a slide from March's highs of $120-plus.

The filing didn't say if Icahn plans to nominate board seats to the struggling video service.

For Icahn, his newly unveiled Netflix stake represents a return to the tech sector after waging a successful campaign for the breakup of Motorola into

Motorola Mobility


Motorola Solutions

(MSI) - Get Report

. In August 2011, Motorola Mobility was sold to


(GOOG) - Get Report

, in one of the largest technology deals since the financial crisis.

In recent days, Netflix has been rumored to be under the gaze of


(MSFT) - Get Report

. Company officials denied the speculation. At this time last year, Netflix CEO Reed Hastings mapped out a plan to split the company's streaming subscription business from its mail-order unit. Investors and analysts balked, prompting the company to retreat from its plan.

Earlier in October, Icahn submitted a tender offer for military truck maker


(OSK) - Get Report

in a $3 billion bid worth $32.50 a share. The Wisconsin-based company's board quickly rejected Icahn's offer, signaling he may need to make a buyout pitch directly to shareholders.

Netflix stands out as Icahn's most notable investment of the fall after he successfully imparted a host of board changes at struggling oil and gas giant

Chesapeake Energy

(CHK) - Get Report

, and was seen as instrumental in the company's divestiture of billions in non-core exploration and midstream assets.

In August, after a rare win in a tender offer campaign for refiner

CVR Energy

(CVI) - Get Report

, Icahn


his bid and is now in the process of IPO-ing individual pieces of the company.

For more on Carl Icahn, see his

investment portfolio


Follow @agara2004

-- Written by Antoine Gara in New York.