Regulators Probe Insider Trading Gaps in UK Bans and US Filings

A study of the London Stock Exchange finds that directors who sit on multiple boards may increase trading in firms where they hold seats when a “close period” bans them from trading in their own company. The research suggests that such trades, which are disclosed and legal, could redirect informed trading rather than suppress it, raising a regulatory gap in the UK’s trading‑ban regime.

Separately, a developer released a Python tool that parses SEC Form 4 filings to score insider conviction for a watchlist of major U.S. companies. The screener highlights large insider purchases, such as a roughly $880 million buy of Tesla shares, and provides a quick signal for investors seeking credible insider buying activity.