It overtook Europe's STOXX 600 (.STOXX), which is up 9%, in late May for the first time this year.
In dollar terms, the STOXX 600 (.STOXXD) is still lagging, having gained 11.3% in 2023, while the euro is up 1.1%.
"Relative to the U.S., European equities are looking less interesting and attractive," said Bernie Ahkong, co-chief investment officer at fund manager UBS O'Connor Global Multi-strategy Alpha.
The euro zone economy was in technical recession in the first quarter, data from European statistics agency Eurostat showed last week.
"But Europe looks even more unattractive than the U.S., because the temporary good data from Europe is really going to turn."
Persons:
Europe's, Bernie Ahkong, UBS O'Connor, Ahkong, Geoffroy Goenen, Candriam, Graham Secker, Morgan Stanley, Hani Redha, Alex Richardson
Organizations:
UBS, UBS O'Connor Global, Alpha, U.S, Bank of America's, Eurostat, Barclays, Thomson
Locations:
U.S, Europe, China, PineBridge, United States