National CineMedia surges 25% after hours Receives 6.8% stake in AMC.

$National CineMedia(NCMI.US)$ shares rose after hours on Tuesday, up 25.52 percent at press time, according to a filing that showed theater chain $AMC Entertainment(AMC.US)$ now owns 6.8 percent of the company. AMC shares rose 2.8 percent after hours.

The news comes from an SEC Form 13G, which states that the company holds a passive stake. 13G filings generally refer to outside institutional investors or individuals who are required to disclose their holdings as public companies when they exceed 5%. A passive equity interest is a holding that is not intended to affect the company's business operations.