Two Harbors Investment more than doubled its jumbo mortgage-backed security issuance in 2015 compared with the previous year, but the increase wasn’t enough to make it worthwhile for the real estate investment trust to continue operating a mortgage conduit. “As we look forward, the environment just was not one that was conducive to the continuation of the business,” Thomas Siering, Two Harbors’ president and CEO, said last week during the REIT’s earnings call. “The market ...