Updated from 12:08 p.m. EDT

Las Vegas Sands

(LVS) - Get Las Vegas Sands Corp. (LVS) Report

shares closed lower on Monday, despite an upgrade by JPMorgan.

Las Vegas Sands was down 7.8% to $4.64 on volume of more than 51.8 million shares.

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JPMorgan analyst Joseph Greff upgraded LVS from neutral to overweight and has a year-end price target of $8. Among the reasons Greff gave for the improved outlook were "reasonable near-term and achievable expectations" for the company's Las Vegas Strip properties and that those properties are outperforming their peers; stabilization of its Macau properties' operations and the potential for continued improved investor sentiment in front of its early 2010 opening of its Singapore property.

MGM Mirage

(MGM) - Get MGM Resorts International (MGM) Report

was down 20% to $5.02 on volume of more than 17 million shares. MGM Mirage has been in the news lately on reports that billionaire investor

Carl Icahn is pushing for the company

to file for Chapter 11 bankruptcy. MGM Mirage is majority owned by another billionaire investor, Kirk Kerkorian.

Boyd Gaming

TheStreet Recommends

(BYD) - Get Boyd Gaming Corporation Report

was off 11.4% to $5.37.

Melco Crown Entertainment

(MPEL)

was lower by 7.1% to $4.21.

Penn National Gaming

(PENN) - Get Penn National Gaming, Inc. Report

was down 4.3% to $27.56.

Wynn Entertainment

(WYNN) - Get Wynn Resorts, Limited (WYNN) Report

was down 7.1% to $30.44.

Ameristar Casinos

(ASCA)

closed down 2.6% to $13.79.