Why is there no choice to select Allow Outside RTH for a Pink/OTC stock?

There are two reasons why an order would be filled during the pre-market session:

1. The submitted order was set to work outside regular trading hours (RTH) or pre-market hours.
2. The order was for an OTC/Penny stock which does not have a pre-market session but starts regular trading hours at 8:00 EST…

If the product you are trading does not trade outside of regular trading hour session (like a US Stock option) the "Allow outside RTH" option within the Order Ticket or the Time-in-Force drop down will be grayed out and you will be unable to add the attribute. Also, MKT/LMT orders for a CME future and MKT/LMT/Stop orders for an ICE/Nybot future are active throughout the 24 hour trading day (both before and after the contract's designated RTH session) and do not require the Outside RTH attribute to be selected, so they too will be grayed out…

On an IPO’s first trade date, IBKR only allows using a Limit Order (you may select “Yes” to allow trading Outside RTH). You may use a Limit-on-Open order before the first actual trade. After the IPO’s first trade, once the stock is trading in the Secondary market, any order type can be used. Orders created and entered prior to the IPO’s first trade will be Price Capped by IBKR…

A US Penny stock does not trade on a major US exchange as it does not meet the exchange's listing requirements. A US Penny stock trading on the Pink/OTC markets is usually low priced, may lack liquidity, and is considered speculative because it has less regulatory standards to meet and less required report filings. A stock that was originally listed on a major US exchange can be "delisted" because it no longer meets the exchange's listing requirements. A company's shares that have been delisted from NYSE, Nasdaq, etc. may later trade on the Pink or OTC markets with less regulatory oversight…