Executive Summary: Key Legal and Evidentiary Issues

• Allocation of risk in uncovered options trading on margin, including whether the broker validly exercised its contractual right to liquidate the clients’ portfolio without prior notice.
• Enforceability and interpretation of a standard-form (adhesion) brokerage contract, particularly clauses on margin calls, liquidation powers, electronic signatures, and risk disclosures.
• Causation and proof of loss in the clients’ counterclaim, including the absence of admissible or reliable evidence that the broker’s margin and liquidation software was defective or negligently designed.
• Credibility of the self-represented defendant trader, especially his inconsistent admissions about having signed the contract and his claimed language barrier during testimony.
• Compatibility of the liquidation clause with article 2759 C.C.Q. and Québec contract law principles on abusive or unconscionable terms in high-risk financial trading relationships.
• Procedural conduct and alleged abuse of process, including multiple unsuccessful disclosure and contempt motions, and the broker’s unsuccessful bid for additional legal costs for substantial breaches in the conduct of the proceedings.

Facts of the case

Interactive Brokers Canada Inc. (IBC) operated as an online discount broker offering clients a fully electronic platform to trade securities and derivatives, including options, on margin. Xing Wang, who described himself as a sophisticated and experienced trader, and his wife, Genghong Zhao, opened a margin account with IBC in 2016. They engaged heavily in high-risk strategies involving uncovered (or “naked”) options on various securities, including Zoom Video Communications, Inc. shares. In a margin account, part of each trade is funded by the client’s own equity and part by a loan from the broker, secured by the client’s account positions. To protect itself from market risk, the broker requires that a minimum level of equity, or margin, be maintained at all times. Mr. Wang traded both call and put options. A call option gave the counterparty the right to force him to sell shares at a fixed strike price; because he often did not own the underlying shares, many of these calls were uncovered, exposing him to theoretically unlimited losses if the market price rose sharply. Put options, by contrast, obliged him to buy the underlying shares at a fixed price, potentially yielding a profit if the market price later exceeded that level. Mr. Wang accepted that options trading generated premiums and fees, could only be executed during market hours, and that prices could move dramatically even when markets were closed.

The triggering market event and margin deficit

On 31 August 2020, shortly after market close, Zoom released exceptionally strong quarterly results, including a year-over-year revenue increase of 355%. The market reacted immediately, with a rapid spike in Zoom’s share price. Although the options could no longer be traded that day, IBC’s systems recalculated the theoretical values of Mr. Wang’s open positions and the corresponding margin requirements for his uncovered calls and his puts. The sharp rise in the value of the underlying Zoom shares drove up the risk and margin requirement on his uncovered calls by far more than any offsetting reduction in requirements on his puts. The result was a substantial margin shortfall and an account deficit. Around 50 minutes after the earnings announcement, IBC’s system issued a written margin call requesting that Mr. Wang inject approximately CAD 1.46 million into the account. Mr. Wang ignored that request and did not add any funds or reduce his positions. The following morning, before the markets opened on 1 September 2020, Mr. Wang’s account appeared on IBC’s risk dashboards as severely deficient. Normally, such a deficit would trigger automatic liquidation under the broker’s risk engine, but in this case the change in exposure was large enough that a global risk manager intervened and manually reviewed the positions. An IBC employee telephoned Mr. Wang to explain the situation and warn that liquidation would occur if he did not meet the margin requirements. Mr. Wang again refused to transfer funds or accept any adjustment to his account. The risk manager then authorised liquidation under the brokerage agreement. IBC proceeded to liquidate Wang’s and Zhao’s positions at then-prevailing market prices. Even after selling out the portfolio, the account remained in deficit. As of 1 September 2020, the net debit balance was approximately CAD 2.57 million, later adjusted to CAD 2,483,649.14 as of April 2021 because of exchange-rate movements.

The brokerage contract and key clauses

The relationship between IBC and the defendants was governed by a standard-form brokerage contract of adhesion, which Mr. Wang had electronically signed when opening the account in January 2016, and which Ms. Zhao also accepted. The contract text appeared online during the account-opening process and included prominent capitalised acknowledgments immediately before and after the signature block, stating that the customer had read and understood all information provided, that the typed electronic signature was equivalent to a handwritten signature, and that the customer intended to be legally bound. The court treated the contract as clear and unambiguous and therefore applied its text directly rather than resorting extensively to supplementary interpretive principles. Several clauses were central. First, IBC expressly disclaimed providing investment, tax, or trading advice and emphasised that it was not authorised to solicit orders, reinforcing that all trading decisions were the clients’ responsibility. Second, the clients agreed to accept the electronic trading system “as is” and to hold IBC harmless for losses caused by hardware or software malfunctions, subject to the limits of Québec law. Third, the broker did not guarantee that all orders would be executed at the best posted price and disclaimed responsibility for orders directed by the client to a particular market. Fourth, Mr. Wang undertook to monitor each order until confirmation or cancellation. Fifth, and most importantly for this litigation, the agreement contained detailed provisions on margin trading and liquidation. Clause 11A warned that margin trading was highly risky and could lead to losses exceeding the amount deposited, and it recorded that the client had read a separate “Disclosure of Risks of Margin Trading” addendum. Clause 11B required the client to monitor the account continuously and to maintain sufficient margin at all times, acknowledging that IBC could change margin requirements at its discretion and that the client must promptly replenish any deficiency without demand. Clause 11C stated that IBC was not obliged to issue margin calls at all and reserved the right to liquidate all or part of the client’s positions without prior notice if margin became insufficient, with the client remaining liable for any residual deficit plus interest and collection costs. Clause 11D confirmed that any margin call had to be satisfied immediately but did not limit IBC’s right to liquidate at any time, nor did it require the broker to follow the client’s instructions on how or when to liquidate. Additional addenda warned specifically about the extraordinary risks of uncovered options, the potential for unlimited loss and large, sudden margin calls, and the possibility of adverse price movements outside regular market hours. The court noted that these provisions collectively mirrored article 2759(1) of the Civil Code of Québec, which allows a creditor holding securities as collateral to liquidate them without notice when such a power is expressly stipulated.

Procedural history and evidentiary issues

Substantively, IBC issued a notice of deficit in early September 2020 and a formal demand in December 2020. It then commenced an action in Québec Superior Court in 2021 to recover the outstanding debit balance. The litigation quickly became procedurally complex. Ms. Zhao did not participate meaningfully in the proceedings and failed to appear at trial, so she was found liable by default. Mr. Wang represented himself and filed multiple late and overlapping pleadings, including successive defences, a counterclaim, and numerous motions for extensions and documentary disclosure, as well as applications alleging contempt of court and abuse of process by IBC. Some of these interlocutory decisions reached the Québec Court of Appeal, which, among other things, granted him an extension to file a defence but later dismissed applications for leave to appeal further disclosure rulings. At trial on the merits, Mr. Wang advanced a large counterclaim exceeding CAD 10 million. He alleged that IBC’s margin and liquidation software was defective, negligently designed, or manipulated to his disadvantage; that the liquidation terms in the brokerage contract were invalid or unconscionable; that his electronic signature was not legally effective; and that the broker had unjustly enriched itself through the forced sale of his positions. A central evidentiary theme was Mr. Wang’s credibility. Although his pleadings and prior testimony acknowledged that he had opened the account, signed the agreement, and traded extensively on margin, he attempted at trial to back away from those admissions, even suggesting at one point that he had not realised there was a binding contract. He also repeatedly claimed not to understand straightforward questions in English, despite having conducted his trades, pleadings, and communications with IBC in English and having previously testified without an interpreter. The judge regarded this behaviour as an attempt to avoid answering unfavourable questions and held that Mr. Wang was not a credible witness. The court then scrutinised the documentary evidence supporting the counterclaim. Mr. Wang relied on self-prepared spreadsheets purporting to quantify his losses and to demonstrate that the liquidation engine had obtained inferior prices or sold more positions than necessary. However, he did not produce the underlying raw trading data, and much of what he attempted to file was ruled inadmissible. The court concluded that his tables lacked probative value and could not establish that the broker’s system was flawed, that a better price should have been obtained, or that a more limited liquidation would have satisfied the margin requirements. Other materials he cited, such as a TD Bank document on margin requirements and a 2013 U.S. Commodity Futures Trading Commission decision involving an earlier version of Interactive Brokers software, were found irrelevant to the present Québec law dispute and insufficient to prove any defect in the software used in Canada in 2020.

Court’s analysis of liability and contractual interpretation

Applying Québec civil law principles of contractual interpretation, the judge began by classifying the brokerage agreement as a contract of adhesion but found no ambiguity in the liquidation and margin provisions. Because the text was clear, the court’s task was to apply, rather than reconstruct, the parties’ common intention. The judge emphasised that Mr. Wang was an experienced options trader who well understood the volatility and risk of uncovered positions on highly sensitive growth stocks such as Zoom. By entering into the agreement, reading the addenda, and then actively trading uncovered calls on margin, he had accepted the possibility that an adverse news event could create a sudden and catastrophic margin deficit, triggering forced liquidation. The court held that Article 2759 C.C.Q. expressly authorised liquidation without notice when stipulated, and that the contract’s liquidation clause was therefore both valid and enforceable. It rejected arguments that IBC was obliged to wait for more favourable prices, to liquidate only a portion of the positions, or to comply with Mr. Wang’s preferred liquidation strategy. Nothing in the contract imposed a duty to optimise the client’s outcome; the broker’s duty was to protect its loan by returning the account to compliance, and the client remained responsible for any remaining debit. On these facts, the broker had actually gone beyond its strict obligations by issuing a written margin call and making a personal phone call before liquidating, even though the agreement had exempted it from any duty to provide advance notice. The judge also dismissed the attack on electronic signature, relying on the contract language that expressly equated typing a name with a handwritten signature and on Mr. Wang’s prior admissions and conduct.

Disposition of the counterclaim and abuse-of-process issues

Having found that the margin deficit and resulting liquidation were a direct consequence of Mr. Wang’s own trading decisions, the court dismissed the counterclaim in its entirety. The alleged software defects were unsupported by admissible evidence or expert testimony, and neither foreign regulatory materials nor third-party margin documents established any breach of a Québec standard of care. The court further held that IBC had not caused any of the pre-liquidation losses that Mr. Wang attempted to attribute to the broker; he alone had chosen his trading strategy and timing. On procedural matters, IBC sought approximately CAD 50,000 in additional legal costs or damages for abuse of procedure and substantial breaches in the conduct of the proceedings. The judge agreed that Mr. Wang’s litigation conduct had been seriously problematic: he had multiplied disclosure motions, attempted to relitigate issues already decided, delayed examinations and scheduling, and ignored or missed deadlines. This behaviour justified a finding of substantial breaches of the guiding principles of civil procedure. However, the court ultimately refused to award special costs because IBC had not put sufficient concrete evidence before the court of the additional financial harm it had suffered in legal fees or other prejudice. Given the lack of detailed proof, any dollar figure would have been arbitrary. The judge therefore confined the remedy to ordinary party-and-party costs and interest on the contractual claim.

Final outcome and monetary award

In the final orders, the Superior Court granted IBC’s originating application in part, dismissed the cross-application by Mr. Wang and Ms. Zhao, and awarded ordinary costs against them. The court held both defendants jointly liable for the debit balance remaining in the margin account after liquidation and ordered them to pay CAD 2,483,649.14, together with interest at the legal rate and the additional indemnity under article 1619 C.C.Q. from 5 October 2021, plus legal costs, thereby confirming IBC as the successful party and fixing the monetary recovery at just under 2.5 million dollars before interest and indemnity.