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Quant fund, long-only 13F filer

Two Sigma Investments

Two Sigma Investments is a data-science-driven quant firm founded by John Overdeck and David Siegel in 2001, using machine learning and distributed computing to trade systematically. It discloses US-listed long equity (and some options) positions each quarter on SEC Form 13F — bonds, cash, private businesses and non-US holdings are not in that filing.

132.9BUSDreported value
5,017positions
+12.4BUSDon the prior filing
WESTERN DIGITAL CORPlargest holding, 1.1%

How has Two Sigma Investments's portfolio moved against the S&P 500?

Rebuilt from its quarterly filings, Two's disclosed portfolio is up 201% since September 2024. Over the stretch where we can compare, since December 2025, it is up 98% against 9% for the S&P 500. The latest filing, for the quarter ended 30 June 2026, lists 5,017 positions worth 132.9B USD.

Two's disclosed holdings, rebuilt at each filing

S&P 500, from Dec 2025, drawn from Two's level then

Long US stock only, held from one filing to the next: an illustrative read, not an audited return.

See the holdings

References
  1. SEC EDGAR Form 13F-HR, quarterly, up to 45 days delayed. Filings are public records. Ticker mapping via SEC public files and OpenFIGI.
  2. Finazon prior-day close, indicative (IEX-derived, not the official close), some closes dollar-rounded at the source
Two Sigma Investments 13F portfolio — holdings and quarterly moves · The Distributed