The Nasdaq rose 1.5% to 24,468.5, while the S&P 500 added 1.2% to 7,126.1, notching record-high closing levels for the third straight day. The Nasdaq extended its advance to a 13th consecutive session, its longest winning streak since 1992, according to CNBC.
The Dow Jones Industrial Average jumped 1.8% to 49,447.9.
Barring energy and utilities, all sectors were in the green, led by consumer discretionary's 2% jump.
The Nasdaq and the S&P 500 saw their biggest weekly gains since May last year, rising 6.8% and 4.5%, respectively, this week. The Dow advanced 3.2% this week, the most since June.
West Texas Intermediate crude oil sank 11% to $84.68 a barrel in Friday late-afternoon trade, while Brent lost 8.7% to $90.71.
"In line with the ceasefire in Lebanon, the passage for all commercial vessels through Strait of Hormuz is declared completely open for the remaining period of ceasefire," Iranian Foreign Minister Seyed Abbas Araghchi said Friday in a post on the X platform.
Vessels must move through a "coordinated route" announced by Iran's Ports and Maritime Organization, Araghchi said.
On Thursday, US President Donald Trump said Lebanon and Israel agreed to a 10-day ceasefire that seeks to pause hostilities between Israel and Iran-backed Hezbollah in Lebanon. That was a key sticking point in peace negotiations between the US and Iran.
"Araghchi's statement represents a significant and unexpected diplomatic opening," Artem Abramov, deputy head of analysis at Rystad Energy, said in a note e-mailed to MT Newswires. "The Strait of Hormuz has been the single most consequential variable in global oil markets since the conflict escalated, and any credible signal that the chokepoint may reopen, even temporarily, is a market-moving development of the first order."
Trump welcomed the reopening of the strait, though he said the US naval blockade of Iran's ports will continue until "our transaction with Iran is 100% complete."
"The news that Iran will allow traffic to resume through the Strait of Hormuz could be an important turning point and the catalyst for upgrades to our economic forecasts, but not immediately," Oxford Economics said in a note. "The development increases the risk that a more lasting deal could be brokered, reducing the likelihood of extreme downside scenarios crystalizing."
Shares of cruise line operators and airlines jumped, with Royal Caribbean Cruises (RCL) up 7.3%, the best performer on the S&P 500, followed United Airlines (UAL) and Carnival (CCL). Southwest Airlines (LUV) rose 5.1%.
US Treasury yields were lower, with the 10-year rate down seven basis points at 4.25% and the two-year rate dropping 7.4 basis point to 3.71%.
In company news, Netflix (NFLX) shares tumbled 9.7%, the third-worst performer on the S&P 500.
The streaming giant late Thursday posted first-quarter revenue above Wall Street's estimates. However, the company disappointed investors by maintaining its margin outlook even though its cost base apparently would have benefited from its decision to walk away from a deal to acquire Warner Bros. Discovery (WBD), MoffettNathanson said in a note Friday.
Gold was last up 1.3% at $4,871.10 per troy ounce, while silver gained 3.4% to $81.40 per ounce.
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