US stocks experienced a strong rebound overnight, but one of Wall Street's largest banks has poured cold water on the optimism. The S&P 500 surged 2.8% on Tuesday, marking its largest single-day gain since May 2025 and its strongest quarter-end closing performance since September 2008. However, JPMorgan's trading desk was blunt in its assessment: the core driver of this rebound was not an improvement in fundamentals, but rather a technical recovery triggered by extremely oversold positions combined with quarter-end rebalancing demand. TMT trader Brian Heavey wrote after the market close, "From our flow perspective, there is no indication that this is anything more than a tactical bounce following oversold conditions." Meanwhile, oil prices remained almost unchanged—a detail multiple analysts view as a key signal that the market's optimistic sentiment may be hard to sustain.
Trigger Factor: Old News Sparks New Moves The immediate catalyst for the rebound was two headlines related to de-escalation in the Middle East. One reported that former President Trump might be willing to end military operations without fully reopening the Strait of Hormuz (SoH); the other indicated that Iranian President Pezeshkian expressed willingness to end the war if security guarantees were provided. According to CCTV News, Iranian President Pezeshkian stated that Iran is willing to end the war, provided its demands are met, particularly guarantees against future aggression. Separately, Xinhua News reported that former President Trump said on the evening of March 31 that the U.S. would end hostilities with Iran within "two to three weeks," possibly reaching an agreement before then. However, these reports contained no substantive new information. Analyst Andrew Tyler noted, "This is likely not new news. These were Iran's initial demands two to two-and-a-half weeks ago—hoping for security guarantees from the U.S. and Israel not only to halt attacks but also to never return, due to Iran's fear of being targeted again after the U.S. midterm elections. This mirrors Ukraine's demands against Russia." Tyler further pointed out that after these demands went unanswered, Iran escalated its conditions to include U.S. troop withdrawal from the Middle East and added war reparations—details already reflected in Iran's response to Trump's 15-point proposal.
Positions Take Center Stage: Oversold Conditions and Quarter-End Rebalancing The primary credit for the rally goes to positioning factors rather than geopolitical news itself. Positioning data shows that as of last Friday, overall market positioning stood at the 18th percentile, similar to levels in mid-March 2025. Although it has recovered from early April lows, it remains in a historically low range—having declined by 2.5 standard deviations over the past four weeks. Meanwhile, quarter-end pension rebalancing generated approximately $34 billion in buying demand, ranking as the eighth-largest single-day pension buying volume this century. Among trend-following systematic investors (CTAs), data indicates that over the past month, CTAs have net sold $184 billion in global equities and hold about $47 billion in net short positions. This extremely bearish positioning means any positive news could easily trigger a short squeeze.
Goldman Sachs' trading desk corroborated this view in its closing report, noting that if the S&P 500 rises another 3.5% from current levels, CTA buying demand would accelerate significantly, with key thresholds at 6,735 and 6,738 points.
Oil Prices Unmoved, Market Optimism May Be Short-Lived Oil price movements are considered a core indicator for assessing the credibility of this rebound. JPMorgan industrial sector expert Paige Henson highlighted that if investors truly believed military de-escalation would lead to substantial risk reduction, oil prices should have reacted. However, with oil prices barely moving during pre-market and intraday trading, she remains cautious about whether stock market optimism can persist. "I believe a genuine de-risking event is closely tied to the reopening of the Strait of Hormuz. We need sufficient visibility and confidence that Iran will fully or largely reopen the strait after U.S. forces withdraw." Commodity strategist Natasha Kaneva has consistently reiterated that the damage is already done and oil prices will continue to rise in the short to medium term. Brian Heavey directly cited this view in his report as evidence that the stock market rebound lacks substantive support.
Tech Sector Foundation Remains Fragile At the sector level, tech stocks experienced sharp volatility over two days. JPMorgan TMT trader Joshua Myers noted that Monday was one of the worst days for U.S. TMT momentum stocks in recent memory, with the AI core infrastructure sector falling 5.6%—led by declines in optics and storage—while the IGV outperformed the SOX by more than 5 percentage points. Micron Technology fell 9.9%, Sandisk dropped 7%, hard drive makers Seagate Technology and Western Digital declined 4.6% and 8.6% respectively, and optical component suppliers Coherent, Lumentum, and Fabrinet fell 9.8%, 6.8%, and 10.9% respectively. On Tuesday, Nvidia announced a strategic partnership with Marvell Technology, including a $2 billion investment, sending Marvell shares up 8.8%. The collaboration involves Marvell supplying custom XPUs and expansion networks compatible with NVLink Fusion, while Nvidia provides Vera CPUs, ConnectX adapters, Bluefield DPUs, NVLink interconnects, and Spectrum-X switches. Myers believes the deal reflects accelerating market penetration of custom ASICs and represents formal recognition of their importance. Nevertheless, Brian Heavey remains cautious about the rebound in memory stocks, noting that while Micron has seen some dip-buying, the "overall feeling remains very fragile," and there are signs of short sellers re-entering the hardware sector.
Traders Still on the Sidelines, ETF Shorts Remain Elevated Despite the day's rebound, overall market activity improvement remains limited. According to a Goldman Sachs report, trading desk activity scored 4 out of 10, a slight improvement from the 2–3 levels maintained for most of the previous two weeks, but still well below normal. The day's theme was clearly focused on a "losers' bounce" year-to-date—with quantum computing, meme stocks, software, and the "Magnificent Seven" leading gains. The latter group has seen a combined market cap recovery of approximately $751 billion since last Friday's close. Meanwhile, ETF short positions remain elevated, with short interest accounting for 40% of activity. The previous day saw net selling in U.S. equities overall, with the ratio of long selling to short selling reaching 4.3 to 1. These data points collectively suggest that market sentiment has not truly shifted—this rebound is more a technical pressure release than the start of a trend reversal.
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