Top potential stocks to sell short- CHTR, RES, R, WBC, FRT, PBI, KEG

1. Charter Communications Inc. (CHTR): Charter Communications, one of the country largest cable companies, has offered to swap its Los Angeles-area cable system with Time Warner Cable's system in Wisconsin, according a recent trade magazine report. Under the proposed trade, Charter, which already offers cable services in the state, would quickly become Wisconsin's largest cable provider.

2. RPC Inc. (RES): RPC hit a new 52-week high Monday as it is currently trading at $27.39, above its previous 52-week high of $27.27 with 649,388 shares traded as of 10:12 a.m. ET. Average volume has been 1.6 million shares over the past 30 days.

3. Ryder System, Inc. (R): In the past 52 weeks, shares of Ryder System have traded between a low of $37.00 and a high of $54.68 and are now at $54.18, which is 46% above that low price. In the last five trading sessions, the 50-day MA has climbed 0.77% while the 200-day MA has risen 0.63%.

4. WABCO Holdings Inc. (WBC): The 140-year-old company makes anti-lock braking systems, air disk brakes and air compressors, and also sells replacement parts, diagnostic tools and other services in the commercial vehicle after-market. Wabco's January-March net income was $114.7 million, or $1.66 a share, up from $30.7 million, or 47 cents a share, a year earlier. On an adjusted basis, the company earned $1.12 per share.

5. Federal Realty Investment Trust (FRT): In the previous quarter, the company reported EPS of $0.53, missing consensus estimates of $0.56. For the full year, analysts expect the company to post EPS of $2.23. In the year-ago period, the company reported EPS of $0.52 on sales of $138 million.

6. Pitney Bowes Inc. (PBI): Pitney Bowes Inc decreased 5.84% to $24.65. The Company posted first quarter revenue of $1.3 billion, a decline of 2%. Earnings per diluted share for the quarter was $0.42 compared to $0.38 per diluted share in the prior year period.

7. Key Energy Services Inc. (KEG): Key Energy Services reported first quarter net income from continuing operations of $0.09 per share after the close Thursday, up from $0.04 per share last year. The consensus estimate was for EPS of $0.07. Second quarter EPS is expected to be between $0.18 and $0.21, which is above the consensus estimate of $0.14.