Stocks jumped $4.5 trillion

U.S. stocks added about $4.5 trillion in market value in eight trading days because the Standard & Poor’s 500 index climbed about 7.7% from 6,328.52 on March 27 to 6,816.89 on April 10, and the index’s market cap was about $58.44 trillion at the end of the first quarter. (finance.yahoo.com) (seekingalpha.com) The spark was not one earnings report or one Federal Reserve meeting. The biggest change was a drop in war fear after the White House announced a two-week pause in attacks on Iran and markets started pricing a lower chance of a prolonged Strait of Hormuz disruption. (cnbc.com) (am.jpmorgan.com) That mattered because oil had been the fastest transmission belt from the Middle East to Wall Street. JPMorgan said Brent crude jumped 63% in March after damage to energy infrastructure and the effective closure of the Strait of Hormuz pushed investors to fear higher inflation and fewer rate cuts. (am.jpmorgan.com) When oil stops screaming higher, stocks can rebound before the economy changes at all. KKR said oil had become the near-term focal point because it can quickly alter expectations for inflation, growth, and central bank policy. (kkr.com) The argument now is not about whether prices bounced. The argument is whether the bounce is broad enough to last, because a healthy rally usually pulls in banks, industrial companies, small companies, and lower-quality credit instead of relying on a few giant technology names. (kkr.com) (am.jpmorgan.com) Credit is the cleanest stress test because bond investors get paid only if companies keep making their payments. The Ice Bank of America United States High Yield option-adjusted spread rose from about 2.65 percentage points at the start of 2026 to about 3.17 percentage points by early April, which means lenders were still demanding more protection from weaker borrowers even as stocks rallied. (forbes.com) (fred.stlouisfed.org) That does not mean a crash is next. It means stocks are trading like the fire is mostly out while parts of the credit market are still smelling smoke, especially below investment grade. (forbes.com) Sector leadership tells the same story in a different language. JPMorgan said the first-quarter rotation away from mega-cap technology helped value stocks beat growth stocks, so a durable recovery would usually need more than the old artificial-intelligence winners retaking the wheel for a few sessions. (am.jpmorgan.com) The simplest way to read the $4.5 trillion jump is that markets rapidly removed one layer of worst-case pricing. The harder question, and the one traders are still testing in April 2026, is whether lower oil, steadier credit, and wider participation can keep carrying stocks after the ceasefire headlines fade. (cnbc.com) (kkr.com)