Greenlight Capital's funds returned -3.3 percent in the third quarter of 2026, trailing the S&P 500's 2.3 percent gain. Year-to-date, the firm is down 1.5 percent versus the index's 12.7 percent advance.
The underperformance reflects an 8.5 percent decline in Greenlight's long portfolio, offset partly by a 7.1 percent gain in shorts. Several holdings fell 10 to 25 percent without company-specific catalysts.
In its Q3 letter, Greenlight addressed AI's economic reality directly. The firm estimates current worldwide end-user AI revenue at less than $100 billion—a fraction of the $30 trillion total addressable market some vendors claim. The firm flagged intense competition among AI providers and the availability of open-source models as structural headwinds.
Greenlight also warned of substantial capital destruction during AI infrastructure buildout, shaping its cautious stance on the broader AI investment landscape.
The firm singled out Fluor Corporation (NYSE: FLR) for defense. Greenlight stated AI will not displace construction—Fluor's core business—and expects companies like Fluor to deploy AI for operational gains and efficiency. Fluor provides engineering, procurement, project management, and construction services across energy, chemicals, and infrastructure sectors.
FLR shares fell 6.0 percent over one month and closed at $46.38 on November 2, 2026, valuing the company at $6.42 billion. The 52-week range is $39.33 to $58.35. Hedge fund ownership increased to 68 portfolios in Q2 from 55 in Q1.
Greenlight's macro portfolio declined 2.0 percent in Q3, bringing year-to-date losses to 6.0 percent, largely from a position betting on Federal Reserve rate cuts that moved against the fund. The firm trimmed that position by one-third for risk management.
