The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage. NEW YORK ( Trefis) - Comcast ( CMCSA) is the leading provider of cable TV, broadband Internet, and digital voice services. It competes with satellite pay-TV providers like Dish Network ( DISH) and DirecTV ( DTV), cable companies like Time Warner Cable ( TWC) and telecom operators like AT&T ( T) and Verizon ( VZ). In addition to competition from traditional cable and satellite and telecom companies, Comcast is also facing mounting challenge from online platforms like Netflix and Google TV. The firm is trying to plug its pay-TV market share declines with the launch of its new service, Xfinity Signature Support. In addition, Comcast hopes its merger with NBC will benefit the company as it gets access to a vast amount of content with a distribution advantage over other pay-TV providers. While we anticipate Comcast's Pay TV market share will stabilize at around 20% by the end of Trefis forecast period, Trefis members project the market share will pass 23%, translating into an upside of 10% to our estimate for CMCSA stock. We currently have a Trefis price estimate of $29.57 for Comcast's stock, about 21% above the current market price of $24.23.