It’s no secret the Dallas region is benefitting from California companies looking to move out of state. But Charles Schwab Corp.’s shift to North Texas is a big one, showcasing the ongoing changes in the region. The retail brokerage said Monday in a news release it’s acquiring rival TD Ameritrade Holding Corp. (Nasdaq: AMTD) in a deal valued at about $26 billion, a massive tie-up for the financial services industry. As part of that, it will shift its corporate headquarters from San Francisco to its new campus in Westlake. The agreement is subject to customary closing conditions, it said. A headquarters relocation from Schwab (NYSE: SCHW) even without the merger would bring heft to North Texas. Click to read more at www.wfaa.com.