---
title: "Short Covering + CTA Buying: The Logic Behind the Overnight US Stock Rebound – Will US-Iran Conflict Escalate in the Short Term?"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/282639752.md"
description: "Signs of détente have emerged in US-Iran diplomacy, combined with an extremely bearish position structure triggering a \"mechanical\" rebound. CTAs bought $19 billion in US stocks last week and are expected to purchase another $43.5 billion next week under flat conditions, approaching historical records. Goldman Sachs believes market sentiment remains fragile, with investors still on the sidelines awaiting the next Iran/Hormuz headline—the risks of further escalation or de-escalation are nearly symmetrical, suggesting continued volatility ahead"
datetime: "2026-04-14T06:28:08.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/282639752.md)
  - [en](https://longbridge.com/en/news/282639752.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/282639752.md)
---

# Short Covering + CTA Buying: The Logic Behind the Overnight US Stock Rebound – Will US-Iran Conflict Escalate in the Short Term?

Signs of détente have emerged in the diplomatic window between the US and Iran, combined with an extremely bearish position structure triggering a mechanical rebound. Overnight, US stocks surged more than 2.2% from their intraday lows. The core logic driving market expectations is singular: the conflict will not escalate further in the short term.

According to CCTV News, Pakistani diplomatic sources stated that the US and Iran have agreed to continue negotiations, though disagreements remain regarding the agenda, objectives, format, and location of the next round. US Vice President Vance publicly stated that "the ball is in Iran's court," implying the negotiation window remains open; Iranian President Pezeshkian also expressed willingness to resume talks within the framework of international law. Under these dual signals, on Tuesday, WTI crude oil fell more than 2% to $96.91 per barrel, while Brent crude dropped 1.88% to $97.49 — **the bullish impact of blockade threats was comprehensively suppressed by expectations of diplomatic détente.**

Previously, the degree of bearishness among hedge funds even exceeded the peak selling during the "Liberation Day" sell-off. Highly concentrated short positions provided ample fuel for this position-repair-style rebound.

**On the position front, Goldman Sachs models estimate that CTAs (Commodity Trading Advisors) purchased $19 billion in US stocks last week, and are projected to buy another $43.5 billion next week under flat conditions, approaching historical records; hedge funds have turned net buyers for the first time in eight weeks.** **The key divergence in the current market lies in whether diplomatic signals of détente can be sustained, or if a new round of conflict will reverse the situation.**

## Extremely Bearish Positions Provide "Fuel" for Rebound

The core driver of this rebound stems first from severe imbalance in position structures.

Goldman Sachs data shows that **on Friday, the degree of bearishness in hedge fund positions exceeded levels seen at the peak of the "Liberation Day" sell-off in early April.**

In terms of specific flows, global equities saw net buying for the first time in eight weeks (+1.2 standard deviations on a one-year basis), driven primarily by long purchases with short covering playing a secondary role; the ratio of buying to covering was approximately 3.6:1. All major regions showed net buying, led by emerging markets in Asia and Europe. Macro broad-based products recorded net buying for the second consecutive week, with short covering as the main driver (ratio approximately 3.5:1).

At the institutional level, asset management firms have net bought S&P 500 futures for two consecutive weeks; global equity mutual funds recorded $37 billion in weekly net inflows ($23 billion in US stocks), a significant acceleration from the previous week's $12 billion.

Sentiment has also improved. Goldman Sachs' US stock sentiment indicator rebounded sharply this week to +0.7, up significantly from -0.9 two weeks ago. The CNN Fear & Greed Index rose from 23/100 to 38/100. The volatility panic index plummeted from around 9 since the outbreak of hostilities to 7, its lowest level in two months.

## CTA Purchases Near Record Levels, Systemic Forces Take Over

**If short covering was the "ignition switch" for the rebound, then systematic CTA buying acts as the "accelerant" continuously pushing prices higher.**

Goldman Sachs' latest model estimates indicate that trend-following CTA funds purchased $19 billion in US stocks last week; **looking ahead to the next week, under flat conditions CTAs are expected to buy another $43.5 billion in US stocks, or $82 billion when calculated on a global equity basis—a scale approaching historical records.** Previously, CTAs had compressed equity positions to extremely bearish levels entering April; now, price stabilization has triggered a reversal of trend signals, releasing concentrated systematic buying pressure.

****

At the retail investor level, the proportion of bulls in the AAII survey rose to 35.7%, while the bearish proportion fell by 8.4 percentage points; sectors most favored by retail investors rebounded sharply, with Bitcoin-sensitive stocks gaining as much as +15.51% over the week. However, JPMorgan data shows retail behavior has evolved from "buying the dip" to "skipping declines and reducing positions at highs," indicating a stronger defensive tone. Their retail trading volume last week fell below the 2nd percentile historically, reflecting lingering doubts about whether the rebound can sustain itself.

The technology sector previously underwent aggressive de-risking, resulting in cleaner positions and lighter exposure, yet fundamentals did not deteriorate synchronously with prices, creating a "gap between price and earnings expectations." Market makers are in a short gamma state, making cheap upside options still attractive; once positions are fully reset and prices stabilize, upside option prices could rapidly reprice.

## US-Iran Negotiations: Broken but Window Not Closed

**Another key thread driving this rebound is the market's repricing of the expectation that the US-Iran conflict will not escalate in the short term.**

The Islamabad marathon negotiations broke down on the 12th. Vance stated in an interview that the Iranian delegation made concessions on two core issues, "they moved toward us... but not far enough." The US's two non-negotiable conditions are: removing Iran's enriched uranium and ensuring Iran lacks uranium enrichment capabilities.

Vance noted that given "the current team and the current timeline," no agreement could be reached, so both sides decided to return to their respective capitals. Iranian Foreign Minister Abbas Araghchi responded on X platform that Iran participated in negotiations "in good faith," but encountered "extremism, moving targets, and blockades" just one step away from reaching the "Islamabad Memorandum of Understanding."

**However, multiple signals suggest diplomatic channels remain open. According to Pakistani diplomatic sources, both sides agreed to continue negotiations, with disagreements persisting on details such as agenda, objectives, format, and location—Iran prefers Islamabad, while the US is considering alternative options.**

According to Xinhua News Agency, Iranian President Pezeshkian spoke with French President Macron on the 13th, stating Iran is willing to continue negotiations within the framework of international law, comply with ceasefire terms, and attribute the failure to reach prior agreements to the US side's "excessive ambition." Vance repeatedly emphasized, "I believe there is indeed a grand deal that can be reached here," and indicated he would wait for Iran to "take the next step."

## Oil Prices Under Pressure: Blockade Threat vs. Diplomatic Signals

Although the US immediately announced maritime blockades on Iranian ports and coastal areas, theoretically constituting a bullish factor for supply tightening, the market reaction was falling oil prices.

Vance characterized the blockade as a means of "additional economic pressure" and stated that full reopening of the Strait of Hormuz is one of the US's clear requirements. He pointed out that part of the premise for the previous 14-day ceasefire agreement was Tehran's agreement to reopen the strait, "but we have not yet seen full reopening," warning that "if they do not do so, it will fundamentally change our negotiations with them." According to Vivek Dhar, analyst at Australia's Commonwealth Bank, the blockade directly threatens Iran's oil exports via the Strait of Hormuz—last month, Iran's oil transit through this channel was approximately 1.7 million barrels per day; "the blockade will further tighten physical oil and refined product markets."

However, oil prices are reacting inconsistently to the same shock—the transmission mechanism typically operating through equities, volatility, and exchange rates is beginning to break down.

**Market participants note that when the same shock begins to produce divergent reactions, it usually signals a narrative shift. Diplomatic signals are overshadowing blockade threats, becoming the dominant logic for current market pricing: Vance's statement returning initiative to Iran rather than declaring negotiations terminated leaves room for diplomatic resolution, which is the core reason investors briefly breathed a sigh of relief.**

## Outlook: Fragile Sentiment, Next Headline Is Key

In its latest position report, Goldman Sachs warned that **sentiment remains fragile. Beyond the mechanical drive of systematic buying, short covering, and highly selective repositioning, investors remain on the sidelines awaiting the next Iran/Hormuz headline—the risks of further escalation or de-escalation are nearly symmetrical, suggesting continued volatility ahead.**

Regarding buybacks, Goldman Sachs estimates that currently about 98% of companies are in a buyback silence period, with buyback flows down approximately 30% from normal levels. The silence period is expected to end around April 28, at which point corporate buybacks will resume providing market support.

In summary, this rebound is dominated by position repair rather than fundamental drivers. Short covering and systematic CTA buying provide strong upward momentum, but the true directional judgment will depend on whether US-Iran negotiations release clearer diplomatic signals in the coming days.

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