Stockpicker Dan Sundheim had a monster June. Here's how D1 and other Tiger Cubs did.

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Dan Sundheim speaks in an office in a dark suit

Dan Sundheim is on a roll.

D1 Capital's public equity book returned roughly 10% in June, a person close to the manager told Business Insider.

That put the fund at 25.7% through 2026's first half, the person added — outperforming the tech-heavy Nasdaq 100 index and the S&P 500, which were up roughly 19% and 10% through the same time period, respectively.

Despite being known as a tech investor, D1 began the second quarter with big holdings in companies such as building materials manufacturer James Hardie International and US Foods, both of which are up more than 20% on the year, according to regulatory filings. D1 Capital, which manages roughly $40 billion, declined to comment.

One thing that didn't drive returns in Sundheim's fund was SpaceX. While D1 held a significant stake in Elon Musk's rocket maker via its private markets fund, the shares in the recently IPO-ed company are still held in that fund, not its public equities book, a person close to the New York-based manager said.

The manager was not the only member of the extended Tiger Management family tree — which includes dozens of funds run by portfolio managers with connections to the late investor Julian Robertson — that had strong Junes.

Glen Kacher's $1.6 billion Light Street Capital made 11.9% last month in the manager's long-short fund, a person close to the California-based firm said. This pushed the fund's 2026 gains to more than 37%.

Philippe Laffont's Coatue Management, meanwhile, bounced back from a rough first quarter, when the manager lost more than 3%, to end the first half of the year up 24.5%. The firm gained 4.7% in June alone, a person close to the firm said.

The managers declined to comment on the specific drivers of their outperformance last month, but federal filings reveal the firms' biggest public holdings at the start of the quarter.

Coatue and Light Street remain heavily focused on artificial intelligence companies, with big bets on Taiwan Semiconductors and Broadcom.

Bradley Saacks covers hedge funds and other asset managers for Business Insider from New York. He first wrote about the multi-trillion-dollar industry for Business Insider from New York in late 2018, after spending two years covering mutual funds for the Financial Times' trade publication, Ignites.He left Business Insider for a little over a year, starting in mid-2022, and worked as a business reporter for Semafor, a media startup. He rejoined Business Insider in 2023, this time in the publication's London office, and has since relocated back to New York. A graduate of the University of North Carolina at Chapel Hill's School of Media and Journalism, he was the recipient of the O.J. Skipper Coffin Award, which is given to the top graduating senior in the reporting track.During his time at Business Insider, he has broken news on the biggest names in hedge funds, including Paul Singer's Elliott Management, Ken Griffin's Citadel, Seth Klarman's Baupost Group, and more. He is interested in telling stories about the people behind the scenes who are driving big changes at the biggest firms. He can be reached on WhatsApp and Signal at +1 919 816 5537.Notable stories include: