I have an account at IB and Think Or Swim. I read numerous people complaining about the margin requirements at IB so I decided to compare it to another broker. Check this out. I calculated the margins for selling 5 DEC 24 calls on the QQQQ for $3.68. IB margin requirement: $5872.50 Maintenance $5604 Now I did the same thing at Think or Swim Margin requirement $2689.50 What the hell happended to IB? If anyone else has an account in another broker could you post the margin requirement for selling 5 DEC 24 CALLS on the QQQQs.