What should I do if a position is missing from my inbound position transfer?

When a position is missing, the best course of action is to contact the delivering firm to determine why the asset was excluded (with the exception of Mutual Funds).

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What products can I transfer from another broker to IBKR?
How can I transfer Canadian shares from my Solium account to IB Canada?
Can I exchange one of my mutual fund positions for a different one?