First my background: I have worked in the industry for almost 30 years. As a broker, as a Sr. Reg. Options Principal/Supervisor. I have held many compliance positions. I've worked on the trading desk. I've worked in the margin dept and was responsible for making decisions as to when and what to sell-out or buy-in on customer accounts to meet margin requirements. I worked this position during the tech bubble bust in 2000 and the post 9/11 market decline. I have served as a expert witness in arbitration hearings concerning option trading. I have also worked as a business analyst in the design and functionality for margin and complex option systems development. I provide this information so one can asses the validity of my opinions and statements here.
There are 3 main organizations for the rules and regulations in the financial services/Security Investment industry. The Exchanges, FINRA , and The SEC. The Security industry is highly regulated primarily for the purpose of maintaining investor confidence.
There's an old saying in the legal arena... "You can't sign away your liability." Or put another way , you can't post a sign on your car that says "Warning: Reckless Driver! Not responsible for any accidents or injuries."
It has been said that on the new account agreement there's a statement that reads something like. "The Broker-Dealer is not responsible for computer failures, system errors or the inability for customers to access the online system interface, or third party systems yada yada yada.... "
I'm sure this is true. You can't expect the broker to be held responsible for you not being able to access your account due to a failure of systems they may, or may not have control. Otherwise, every time their internet provider went down or failed to have sufficient secure connection ports, some people would be calling to say they woulda... coulda... bot xyz @ x..... That said, it's not ok to just blame a the computer every time the customer is disadvantaged. All the brokerage firms I worked for had to have contingency plans to accommodate customer orders in the case of system failure. For example: I personally was responsible for writing and presenting to a represenitive of the SEC our document for Y2K with contingencies for any system failures. This not only included computers but phone systems, building access etc. etc.
Now the margin agreement, " We reserve the right to take action in the account to restore or maintain minimum margin requirements without notice. " or something along those lines. That's true. The broker must be able to take action when necessary to protect the firm's capital and return the account to the minimum house requirements and/or the Exchange minimum requirements. The worst thing in the margin department was an account that went "Liq-to-Def" that was to say you could liquidate the entire account and still have a deficit. Many broker-dealers went out of business after the crash of '87 who failed to control risk on accounts with naked puts. The Broker-Dealer is ultimately responsible to the street to make good on all trades. If unable to collect the required funds from the client, it's a charge to the firm's net capital. Falling below Net Capital requirements requires a infusion of funds or closure and SIPC. That being said, it is the margin depts. responsibility to document all margin requirements,(you have no idea how many reports are generated each day) Reg. T, Day Trading, or house and document the resolution of same. Documentation for regulators and if action was taken, for the possibility of arbitration. No system that I have worked with had the capability to correctly handle every contingency. Corporate actions that would cause an adjustment in the options would sometimes effect the proper pairing of the options and produce a false call. Now I can not speak to the policies and procedures at IB, I never worked there. However for several years I would handle from 80 to 180 margin calls per day, fast markets and slow. When required to take action and do a sell-out or a Buy-in to meet a margin call I was required to return the account to margin compliance with as few transactions and as little pain as possible. It was very vary rare that I would have to take action without any attempt of contacting the customer and provide the opportunity for the customer to make the choice of what position to close or to deposit funds. When it did happen in was under very unusual circumstances, a concentrated position that was getting hammered for example. 5/6 was an unusual market. But We would Never every liquidate a position that was moving in favor of the customer, whenever possible our choice of what position to close was based on the position that was causing the pain.
I would speculate that the circumstances of the May 6th market, either buy human intervention, or a systemic search for all short put position and auto-liquidation revealed short comings. Under no circumstances would the regulatory bodies allow a customer to suffer monetary loss not in accordance Rule 431 due to system or human errors on the part of the broker dealer. The new account and margin agreements clients sign are written by lawyers, even so there's no way to write up an agreement that states that if we totally screw-up, your screwed.