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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%

What does Two Sigma Investments hold?

WESTERN DIGITAL CORP is the largest disclosed position, at 1.1% or 1.5B USD. The 15 largest positions, listed below, make up 11% of the 132.9B USD portfolio.

SEC EDGAR Form 13F-HR, quarter ended 30 June 2026

Top holdings by reported value
PositionValueWeightSharesLast quarter
WESTERN DIGITAL CORPNo US ticker on file1.5B USD1.1%89.0MHeld
AMZNAMAZON COM INC1.4B USD1.0%5.7MHeld
NVDANVIDIA CORPORATION1.3B USD0.9%6.3MTrimmed
AAPLAPPLE INC1.2B USD0.9%4.2MTrimmed
TSLATESLA INC1.2B USD0.9%2.9MHeld
BRK.BBERKSHIRE HATHAWAY INC DEL1.1B USD0.8%2.3MAdded
JPMJPMORGAN CHASE & CO968.1M USD0.7%3.0MHeld
MAMASTERCARD INCORPORATED945.6M USD0.7%1.8MHeld
COSTCOSTCO WHOLESALE CORPORATION941.3M USD0.7%1.0MHeld
ASMLASML HLDG NV918.1M USD0.7%461.5KHeld
AMDADVANCED MICRO DEVICES INC880.3M USD0.6%1.5MHeld
CCITIGROUP INC831.1M USD0.6%5.9MAdded
BSXBOSTON SCIENTIFIC CORP826.2M USD0.6%19.4MAdded
GOOGLALPHABET INC802.9M USD0.6%2.2MTrimmed
LMTLOCKHEED MARTIN CORP799.8M USD0.6%1.6MHeld
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