我是谁 发表于 2011-4-25 14:49
this margin is not that m argin
say, you opened an account, put 100K in it. IB let you use this account up to 200K( I am not sure about exact number). So you can buy 200K/133.66=1495 shares of SPY. Here IB say you used 200K margin. Each 100 SPY need margin of
￥13366.
Some other broker might say “You used 100K margin， because 100K was yours and you borrowed 100K”
我是谁 发表于 2011-4-25 15:05
say, you opened an account, put 100K in it. IB let you use this account up to 200K( I am ...
I see. It is margin available vs margin used.
For example, when you hold es, that position contributes to your available margin. However, after selling covered call, that position is used to cover the call, so it no longer contributes to your available margin.
I only learnt not too long ago I myself
“也就是说一个future option 对应一个future contract ? ”---YES
Yes I am earning premium。
It is just me： I never Buy To Open options。
Now I consider this is Bull Market So I hold long and sell covered calls。 If I am sure ES will go down， I will just sell ES and Buy ES later
maldini 发表于 2011-4-25 15:15
这里我又不懂了
比方说你buy ES at 1300
sell covered call with strike price at 1290
long1ES--------positionA
short 1 ES call-----position B
so you have 2 positions
if when call expires ES=1290, positionA lost 10X50 = 500 dollars; positionB gained whatever you have sold that ES call
for, say, 200 dollars.
so your net gain is -300 dollars
maldini 发表于 2011-4-25 15:18
那风险很大啊，如果一个坏消息市场大跌岂非容易被wipe out?
我也在研究赚premium
但我只敢用etf like ...
yes.
please use simulate account to fool around enough time and trades before you use real account. So you will be familiar with fees , margins, fills, ... etc.
狗仔卡
发表于 2011-4-25 01:58 PM
