Nasdaq halts trading for two Houston biotech firms

The Nasdaq stock exchange halted trading for two Houston-based biotech companies as regulators question their recent claims regarding Covid-19 treatments.

Moleculin Biotech Inc. (Nasdaq: MBRX) and CNS Pharmaceuticals Inc. (Nasdaq: CNSP), both headquartered in Houston, had their common stock trading halted by the Nasdaq, the companies announced in separate news releases May 18. The trading halts are “pending the receipt of additional information” from the biotech firms, according to both releases.…