(Bloomberg) – China plans to tighten controls on foreign stock sales by domestic companies and ban those whose listing could pose a threat to national security. Most read by Bloomberg All Chinese companies seeking initial public offerings and additional overseas share sales would have to register with the China Securities Regulatory Commission, according to a consultation paper released late Friday. Under the proposals, firms whose listing on foreign exchanges could threaten national security will be banned from selling shares and firms whose activities raise cybersecurity concerns will be subject to security audits. “Improving oversight of overseas listed companies comes with…