Two Sigma Investments (Siegel/Overdeck)Superinvestor
About Two Sigma Investments (Siegel/Overdeck)’s 13F portfolio
Two Sigma Investments (Siegel/Overdeck) is an institutional investment manager that discloses its US-listed holdings each quarter through an SEC Form 13F filing. As of , Two Sigma Investments (Siegel/Overdeck) reported $132.9B across 3,901 US-listed positions (). Its largest position is WESTERN DIGITAL CORP (WDC) at 1.1% of the reported book, and its ten biggest holdings make up 9% of the portfolio. Browse every manager in the fund managers directory, or see the legendary investors we track on the superinvestors page.
| # | Stock | Price | % of portfolio | Shares | Value |
|---|---|---|---|---|---|
| 1 |  NASDAQ: WDC WESTERN DIGITAL CORP | $467.46 +5.86% | 1.1% | 89.0M | $1.5B |
| 2 |  NASDAQ: AMZN AMAZON COM INC | $258.51 −0.15% | 1.0% | 5.7M | $1.4B |
| 3 |  NASDAQ: NVDA NVIDIA CORPORATION | $230.36 +0.84% | 0.9% | 6.3M | $1.3B |
| 4 |  NASDAQ: AAPL APPLE INC | $319.97 −2.51% | 0.9% | 4.2M | $1.2B |
| 5 |  NASDAQ: TSLA TESLA INC | $354.08 −5.92% | 0.9% | 2.9M | $1.2B |
| 6 |  BRK.B BERKSHIRE HATHAWAY INC DEL | $485.23 +1.18% | 0.9% | 2.3M | $1.1B |
| 7 |  NYSE: JPM JPMORGAN CHASE & CO | $358.64 −0.94% | 0.7% | 3.0M | $968.1M |
| 8 |  NYSE: MA MASTERCARD INCORPORATED | $579.21 −1.11% | 0.7% | 1.8M | $945.6M |
| 9 |  NASDAQ: COST COSTCO WHOLESALE CORPORATION | $915.74 −1.04% | 0.7% | 1.0M | $941.3M |
| 10 |  NASDAQ: ASML ASML HLDG NV | $1,714.88 +4.17% | 0.7% | 462K | $918.1M |
| 11 |  NASDAQ: AMD ADVANCED MICRO DEVICES INC | $477.57 +4.69% | 0.7% | 1.5M | $880.3M |
| 12 |  NYSE: C CITIGROUP INC | $137.72 −0.30% | 0.6% | 5.9M | $831.1M |
| 13 |  NYSE: BSX BOSTON SCIENTIFIC CORP | $47.80 +1.81% | 0.6% | 19.4M | $826.2M |
| 14 |  NASDAQ: GOOGL ALPHABET INC | $338.46 −1.11% | 0.6% | 2.2M | $802.9M |
| 15 |  NYSE: LMT LOCKHEED MARTIN CORP | $525.28 −1.44% | 0.6% | 1.6M | $799.8M |
| 16 |  NASDAQ: ISRG INTUITIVE SURGICAL INC | $366.70 −0.85% | 0.6% | 2.0M | $787.1M |
| 17 |  NYSE: SCHW SCHWAB CHARLES CORP | $109.29 −0.99% | 0.6% | 8.4M | $777.4M |
| 18 |  NASDAQ: KMB KIMBERLY-CLARK CORP | $104.96 −1.60% | 0.6% | 7.1M | $774.4M |
| 19 |  NYSE: GS GOLDMAN SACHS GROUP INC | $1,038.61 +0.07% | 0.6% | 754K | $762.1M |
| 20 |  NYSE: TJX TJX COS INC NEW | $132.08 −0.08% | 0.6% | 5.0M | $756.1M |
| 21 |  NASDAQ: TMUS T-MOBILE US INC | $181.52 −3.46% | 0.6% | 4.4M | $745.4M |
| 22 |  NYSE: ABT ABBOTT LABORATORIES | $108.33 −0.42% | 0.6% | 8.1M | $737.4M |
| 23 |  NYSE: RBLX ROBLOX CORP | $43.31 +4.34% | 0.6% | 13.4M | $731.3M |
| 24 |  NASDAQ: IBKR INTERACTIVE BROKERS GROUP IN | $92.62 −0.36% | 0.5% | 8.3M | $725.9M |
| 25 |  NYSE: MS MORGAN STANLEY | $217.72 +0.26% | 0.5% | 3.4M | $715.7M |
Showing 1–25 of 500 positions on this page — of 3,901 total reported in this 13F. Positions beyond the first 500 are not yet available on this page.
- Technology19%
- Financial Services11%
- Healthcare10%
- Industrials9.1%
- Consumer Cyclical8.2%
- Communication Services3.4%
- Basic Materials3.1%
- Consumer Defensive2.5%
- Energy2.4%
- Real Estate1.8%
- Utilities1.7%
- AddedBRK.BBERKSHIRE HATHAWAY INC DEL+40.3%$1.1B
- AddedMAMASTERCARD INCORPORATED+9.9%$945.6M
- AddedCOSTCOSTCO WHOLESALE CORPORATION+15.0%$941.3M
- AddedASMLASML HLDG NV+21.8%$918.1M
- AddedAMDADVANCED MICRO DEVICES INC+10.5%$880.3M
- AddedCCITIGROUP INC+38.0%$831.1M
- AddedBSXBOSTON SCIENTIFIC CORP+106%$826.2M
- AddedLMTLOCKHEED MARTIN CORP+16.4%$799.8M
- AddedISRGINTUITIVE SURGICAL INC+40.8%$787.1M
- AddedSCHWSCHWAB CHARLES CORP+57.2%$777.4M
- ReducedWDCWESTERN DIGITAL CORP−0.3%$1.5B
- ReducedAMZNAMAZON COM INC−9.8%$1.4B
- ReducedNVDANVIDIA CORPORATION−44.1%$1.3B
- ReducedAAPLAPPLE INC−29.7%$1.2B
- ReducedTSLATESLA INC−1.8%$1.2B
- ReducedJPMJPMORGAN CHASE & CO−10.7%$968.1M
- ReducedGOOGLALPHABET INC−49.3%$802.9M
- ReducedTJXTJX COS INC NEW−4.8%$756.1M
- ReducedMSMORGAN STANLEY−8.5%$715.7M
- ReducedPGRPROGRESSIVE CORP−14.1%$662.0M
Reading Two Sigma Investments (Siegel/Overdeck)’s 13F portfolio
Two Sigma Investments (Siegel/Overdeck)’s $132.9B 13F book is spread across 3,901 reported positions and is broadly diversified — the ten largest names are just 9% of the portfolio. Spread this wide across 3,901 names, no single position dominates, which is typical of large, index-oriented mandates that track broad market exposure. Its five largest positions are WDC, AMZN, NVDA, AAPL and TSLA, led by WESTERN DIGITAL CORP (WDC) at 1.1% of the portfolio. The heaviest sector exposure is Technology (19%), then Financial Services (11%).
What Two Sigma Investments (Siegel/Overdeck) changed last quarter
Between 2026-03-31 and Q2 2026, Two Sigma Investments (Siegel/Overdeck) was a net buyer: it opened 665 new positions and added to 1,561 more, while trimming 1,472 and closing 443 outright. Against a 3,901-name book, that is high turnover, pointing to an active reshuffle of the book. Its largest new or increased position was BERKSHIRE HATHAWAY INC DEL (BRK.B), and its biggest reduction was WESTERN DIGITAL CORP (WDC).
What a 13F does and doesn’t reveal
A 13F captures only Two Sigma Investments (Siegel/Overdeck)’s long positions in US-listed stocks at a single quarter-end, so it is best read as a lagged snapshot rather than a live portfolio. It won’t show shorts, cash, bonds, or holdings listed outside the US, and it never reveals the price paid or the reasoning behind a trade. The signal is in the pattern over time: which names Two Sigma Investments (Siegel/Overdeck) is building up, trimming, or exiting, and how concentrated the book stays from quarter to quarter.
Frequently asked questions
What is an SEC 13F filing?
A Form 13F is a report that every institutional investment manager with at least $100 million in US-listed securities must file with the SEC within 45 days of each quarter's end. It lists the manager's long positions in US-listed stocks and certain options, with the share count and market value of each. Two Sigma Investments (Siegel/Overdeck)'s profile on this page is built directly from those filings.
How current is the 13F data on Two Sigma Investments (Siegel/Overdeck)'s page?
It reflects Two Sigma Investments (Siegel/Overdeck)'s most recently filed 13F, currently the quarter ending Q2 2026. Because managers have up to 45 days after a quarter closes to file, a 13F is always a slightly lagged view rather than a live portfolio. When Two Sigma Investments (Siegel/Overdeck) files its next quarterly report, this page refreshes automatically.
Can I see Two Sigma Investments (Siegel/Overdeck)'s complete list of holdings?
This page highlights Two Sigma Investments (Siegel/Overdeck)'s largest positions rather than all 3,901 names in the filing. The complete, position-by-position 13F is public and available from the SEC's EDGAR database under Two Sigma Investments (Siegel/Overdeck)'s filings.
Does a 13F show everything Two Sigma Investments (Siegel/Overdeck) owns?
No. A 13F only covers long positions in US-listed stocks and certain options. It leaves out short positions, cash, bonds, commodities, foreign-listed stocks, and private holdings, so it is a partial view of Two Sigma Investments (Siegel/Overdeck)'s book rather than its full strategy or total assets.
Is 13F data investment advice?
No. Everything here is educational. 13F positions are disclosed with a delay, cover only long US-listed holdings, and never explain why Two Sigma Investments (Siegel/Overdeck) made a trade or at what price. Treat it as a research lens, not a recommendation, and speak with a licensed financial advisor before making investment decisions.
Not investment advice. Holdings data comes from public SEC Form 13F filings, which are filed with a delay of up to 45 days and may be amended later. It describes historical, disclosed positions in US-listed securities only, meaning no shorts, cash, or foreign holdings, and it is not a recommendation. Always do your own research and speak with a licensed financial advisor before making investment decisions.