Having looked into this a bit more I think I can see what's happened.
I partially closed the position and crystalised a loss which should
have gone to cash.
According to the report what's actually happened is instead of the loss
going to cash, IB, having reduced my position appropriately, then
redistribute the existing unrealised loss across the smaller number of
shares, hence the avg price sinks noticeably.
So I end up with no realised loss despite having partially closed the
position. I end up with the same (as pre-trade) unrealised loss over a
smaller number of shares.
Why do they do this? It's really unexpected and hence confusing.
Best,
G.
On Wed, 16 Dec 2020 07:35:51 -0800
"mdelvaux2" <mdelvaux@...> wrote:
I am not an IB insider, so takes this with a grain of salt. It seems
that the average cost can be calculated as approximately the (close -
realized - unrealized) / position
55.42 + (-304.06 - 385.78) / 86 = 47.39860465116279
That would make the avgCost about what is needed to breakeven on the
combined trade
