I just got this back from etrade.
Thank you for your message regarding online trading for MRDY in account xxxx-***. I apologize for any inconvenience. Our order room places certain securities on a hard stop list that requires a principal to review the order prior to placing a trade on the security. This can be for several reasons. The most common are recent volatility or pending corporate actions. Unfortunately I can't give you the specific reason this security is restricted at this time. Should you have any further questions regarding this issue, please feel free to contact us at 1-888-388-2900.
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