President Trump's tendency to announce major developments over the weekend has compelled Wall Street to readjust its strategies. Last Saturday, Trump declared that Iran had 48 hours to reach an agreement or face a series of devastating strikes targeting public utilities and other infrastructure. However, by Monday, he reversed course, announcing a five-day suspension of attacks on energy facilities. Following the news, Brent crude oil plummeted by more than 14% at one point during Monday's trading session. Then, on Thursday, after U.S. stock markets had closed, Trump extended the deadline to April 6. Spot crude oil prices initially turned negative and risk assets briefly rebounded, but markets appeared to grow increasingly "immune" to Trump's verbal interventions, with asset prices eventually reverting to their intraday trends. By Friday, as tensions escalated further, U.S. crude oil had recouped all of its weekly losses, while U.S. stocks suffered significant declines, with the Dow Jones Industrial Average falling more than 10% from its yearly high, following the Nasdaq into correction territory. Trump's actions during market closures have had a tangible impact on trading behavior. Traders across equities, fixed income, and commodity markets are now generally reluctant to hold large positions heading into the weekend, aiming to avoid sharp volatility at Monday's open. Kathy Jones, Chief Fixed Income Strategist at Charles Schwab, remarked this week, "Entering the weekend with any sizable position could lead to a very difficult Monday morning." Over the past year, Trump has repeatedly taken major actions on Saturdays, including airstrikes against Iran last June, efforts to seize control of Venezuelan President Maduro, and the latest military maneuvers targeting Iran—all timed when major markets, including foreign exchange, are closed. A White House spokesperson, Kush Desai, denied any connection between the timing of military actions and market closures, stating, "The suggestion that these operations are scheduled around stock market hours rather than intelligence and operational effectiveness is absurd and believed only by those who have never planned even a child's birthday party." An unnamed White House official also cited in reports insisted that the clustering of significant events on weekends is purely coincidental. Nevertheless, Trump's pattern of dramatic moves outside market hours has reshaped the dynamic between Wall Street and Washington. As the reality of a potential closure of the Strait of Hormuz looms larger, his ability to soothe markets with optimistic rhetoric is waning. Even a 10-day suspension of military action offers no guarantee of stability. A proprietary analysis framework developed by Deutsche Bank strategists indicates that Trump tends to make his most impactful decisions when market stress is highest. The bank's "stress index," which weighs the S&P 500, U.S. Treasury yields, inflation expectations, and Trump's approval rating, has surged to its highest level since he took office in January 2025. Previous peaks coincided with Trump's delay of "reciprocal tariffs" last spring, his clarification that he would not fire Fed Chair Powell last summer, and his earlier threat to seize Greenland. Evidence also shows that Trump's weekend announcements significantly impact Monday openings. For instance, the frequency of large gaps between Friday's close and Monday's open in the EUR/USD pair and the S&P 500 has increased, leaving investors little time to quickly unwind losing positions. Despite the temporary pause, the market remains uncertain about what comes next. Wolfe Research analyst Tobin Marcus dubbed Trump's latest maneuver the "Schrödinger's TACO" and warned in a Monday report that as Trump deploys additional Marines to the region, the risk of seizing Iran's key oil export hub, Kharg Island, is rising, keeping escalation threats elevated. Marcus wrote, "Once these forces are in place, Trump will face a choice: back down, escalate, or muddle through. We don't think it will be an easy decision, but investors must take the possibility of escalation seriously." Trump's ambiguous signals on Middle East tensions have drawn criticism. Former Deputy Secretary of State Wendy Sherman commented, "This may just be a delaying tactic until our forces are fully deployed, but if so, the U.S. faces a protracted standoff, and the President won't be able to continue manipulating markets every Saturday and Monday morning." Josh Lipsky, Director of the Atlantic Council's GeoEconomics Center, urged caution, stating, "I think markets, and all of us, should expect weekend volatility to increase going forward." However, he also warned against overinterpreting any perceived regularity in these patterns.
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