High-profile, insider-trading cases make headlines for the Securities and Exchange Commission, but the more pressing problem that concerns the industry is the fragility and quirkiness of the tech-driven structure of U.S. equities markets, writes Greg MacSweeney. Whether it's "algo-fueled conspiracies that flood specific stocks with orders, or other high-tech market shenanigans," the SEC under its new leadership "should play a role when it comes to investigating the market abnormalities," MacSweeney writes.

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