Big Gains for Dan Sundheim’s D1

The ex-Viking star has been boosted by public long holdings, private investments, and short positions.

Illustration by II

Illustration by II

Former Viking Global Investors partner Dan Sundheim has gotten off to a strong start since he launched his firm, D1 Capital Partners, last July.

Sundheim’s fund posted an 11.8 percent gain in the first quarter of this year, according to people familiar with the results.

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