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 | — — | 1.1% | 89.0M | $1.5B |
| 2 |  NASDAQ: AMZN AMAZON COM INC | — — | 1.0% | 5.7M | $1.4B |
| 3 |  NASDAQ: NVDA NVIDIA CORPORATION | — — | 0.9% | 6.3M | $1.3B |
| 4 |  NASDAQ: AAPL APPLE INC | — — | 0.9% | 4.2M | $1.2B |
| 5 |  NASDAQ: TSLA TESLA INC | — — | 0.9% | 2.9M | $1.2B |
| 6 |  BRK/B BERKSHIRE HATHAWAY INC DEL | — — | 0.9% | 2.3M | $1.1B |
| 7 |  NYSE: JPM JPMORGAN CHASE & CO | — — | 0.7% | 3.0M | $968.1M |
| 8 |  NYSE: MA MASTERCARD INCORPORATED | — — | 0.7% | 1.8M | $945.6M |
| 9 |  NASDAQ: COST COSTCO WHOLESALE CORPORATION | — — | 0.7% | 1.0M | $941.3M |
| 10 |  NASDAQ: ASML ASML HLDG NV | — — | 0.7% | 462K | $918.1M |
| 11 |  NASDAQ: AMD ADVANCED MICRO DEVICES INC | — — | 0.7% | 1.5M | $880.3M |
| 12 |  NYSE: C CITIGROUP INC | — — | 0.6% | 5.9M | $831.1M |
| 13 |  NYSE: BSX BOSTON SCIENTIFIC CORP | — — | 0.6% | 19.4M | $826.2M |
| 14 |  NASDAQ: GOOGL ALPHABET INC | — — | 0.6% | 2.2M | $802.9M |
| 15 |  NYSE: LMT LOCKHEED MARTIN CORP | — — | 0.6% | 1.6M | $799.8M |
| 16 |  NASDAQ: ISRG INTUITIVE SURGICAL INC | — — | 0.6% | 2.0M | $787.1M |
| 17 |  NYSE: SCHW SCHWAB CHARLES CORP | — — | 0.6% | 8.4M | $777.4M |
| 18 |  NASDAQ: KMB KIMBERLY-CLARK CORP | — — | 0.6% | 7.1M | $774.4M |
| 19 |  NYSE: GS GOLDMAN SACHS GROUP INC | — — | 0.6% | 754K | $762.1M |
| 20 |  NYSE: TJX TJX COS INC NEW | — — | 0.6% | 5.0M | $756.1M |
| 21 |  NASDAQ: TMUS T-MOBILE US INC | — — | 0.6% | 4.4M | $745.4M |
| 22 |  NYSE: ABT ABBOTT LABORATORIES | — — | 0.6% | 8.1M | $737.4M |
| 23 |  NYSE: RBLX ROBLOX CORP | — — | 0.6% | 13.4M | $731.3M |
| 24 |  NASDAQ: IBKR INTERACTIVE BROKERS GROUP IN | — — | 0.5% | 8.3M | $725.9M |
| 25 |  NYSE: MS MORGAN STANLEY | — — | 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.