X0303 4 2011-03-08 0001005757 CSG SYSTEMS INTERNATIONAL INC CSGS 0001382513 Ruble Joseph Thomas 9555 MAROON CIRCLE ENGLEWOOD CO 80112 1 EVP, Gen Counsel & Secretary Common Stock 2011-03-08 4 S 0 3015 20.00 D 110074 D Common Stock 2011-03-11 4 F 0 1813 19.65 D 108261 D Common Stock 2011-03-11 4 F 0 1813 19.65 D 106448 D Common Stock 2011-03-11 4 F 0 1555 19.65 D 104893 D The shares sold in Table 1 are pursuant to a 10b5-1 plan. The price reported above reflects the weighted average sale price. 17,500 shares of restricted stock held by Mr. Joseph T. Ruble vested on March 11, 2011. The sold shares reported on this form represent those shares sold to cover a portion of the personal income tax withholding requirements as a result of such vesting. 17,500 shares of restricted stock held by Mr. Joseph T. Ruble vested on March 11, 2011. The sold shares reported on this form represent those shares sold to cover a portion of the personal income tax withholding requirements as a result of such vesting. 15,000 shares of restricted stock held by Mr. Joseph T. Ruble vested on March 11, 2011. The sold shares reported on this form represent those shares sold to cover a portion of the personal income tax withholding requirements as a result of such vesting. Joseph T. Ruble 2011-03-14