After waiting four months has my account finally achieved a new high water mark. The previous high water mark, set on June 4th, was broken on October 21st. And was retested the following Friday (Oct 27th). The month ended at a new high water mark, with the account's relative net liquidation value at 170%, meaning that I have 70% profit on my total invested amount of money. Being at a high water mark is the current drawdown zero.
Overview of open positions at the end of the month (IB symbol codes):
futures, long: ES, ESTX50, LE
futures, short: 3KTB, GE, MXP, NG, PL, V2TX, ZC, ZT
ETF stock, long: DIA, EFA, EWJ, SMH, SPY, XLB, XLI, XLK
This month most of the excitement came from handling margin requirements. Several instruments increased position size at the same time, resulting in warnings from IB about margin. Luckily it stayed with warnings: they did not interfere with my account. I did some tweaking to my system to make it operate not as close to the limit. I guess this is a practical limitation which you encounter when you're using a small account. With a larger account one can diversify over more instruments. This makes it less likely that all/many instruments will increase position size at the same time, resulting in margin requirement limitations.
Whether it is triggered by the margin warning or not I don't know, but IB has decided to make it more costly for me to do business with them. They've sent me a message in which they explain that they exposed my account to a stress test and concluded that this account falls in the very high risk category. With a possibility that the account value goes negative. To reduce the potential financial impact for IB will they now charge a "Daily Exposure Fee". Their explanation sounds like I will have to pay them an insurance premium for the risk that I'm exposing them to. I'm not sure how much this will actually be, but I think it is about 1 USD per calendar day (30 USD per month). Going forward IB will perform this stress test daily, and the premium will be calculated daily. I ran some what-if tests in TWS and noticed that this Fee is only influenced by the position size of ES, ESTX50 and V2TX. VIX and NQ would also have a relatively large impact, but I'm not using these instruments. All other instruments which I monitor have no influence on this Fee.
A few days later I received another message from IB, in which they announce that they will raise margin requirements for certain non-US volatility products (previously they already did so on US volatility products e.g. VIX futures). The list includes the V2TX futures which I use. I will have to monitor my margin usage and throttle V2TX usage a bit lower, if so required.
Having to tweak and fine-tune the system on an almost daily basis due to margin limitations is a good sign: it means that multiple instruments are moving and their position sizes are getting larger. This, in turn, is a sign of a growing portfolio and account value. It reminds me of a saying which a former manager at work told me: "you're not trying hard enough if you don't have the feeling of being out of control". Being in control gives a feeling of security, but being on the verge of out of control is more exciting.