I can pull information from shares and options - but is it possible to see vertical and horizontal option strategy pricing in excel?
Limited-loss option strategies have the same initial margin and maintenance margin (actually none because you already put up the max you can loose). https://www.interactivebrokers.com/en/index.php?f=26660 Margins are like condoms, I don't worry about them.
Interesting - but TWS says otherwise: Naked Puts for the same strike seem to require more margin that vertical bull spreads with a buy leg 10% lower. It could be a case of illiquid options only (or just the ones that I am looking at) but TWS does not lie.