Investors capital almost overdrawn — reflected losses, ultimately! (12)

'investors' is the definition.
(stockholder is a kind of investor)

'capital almost overdrawn reflected losses ultimately' is the wordplay.
I cannot quite understand how this works, but
'capital' could be 'stock' (stock is a kind of capital) and 'stock' is present in the answer.
The remaining letters 'holders' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?