Shares of Charter Communications Inc., the St. Louis-based cable provider, jumped the most in almost nine months after the company reported an increase in customers.

Customer relationships rose 99,000 in the first quarter, Charter said Tuesday in a statement. The company added 141,000 residential Internet customers and 20,000 video customers. That compares with a loss of 24,000 video subscribers a year earlier.

The shares climbed as much as 7.1 percent to $66.18, the biggest intraday gain since Aug. 11. The stock had climbed 8.6 percent this year before Tuesday.