Q2 2026 13F · SEC CIK 1218663
Oberndorf William E
Investment managerFiled 2026-08-13 for Q2 2026. Open the filing ↗ · All SEC filings ↗
- Reported 13F value
- $55.0M
- Reported positions
- 8
- Top holdings a year, 3 yrs
- +14.2%
- Average holding period
- 1.6 yrs
Oberndorf William E is an investment manager that reported 8 positions worth $55.0M in its Q2 2026 13F, filed 2026-08-13. Its largest holdings were Unitedhealth Group Inc (UNH, 26.9%), Guidewire Software Inc (GWRE, 16.1%), Amazon Com Inc (AMZN, 15.6%). A portfolio copying its top holdings returned 14.2% a year over the last 3 years, against 20.4% for the S&P 500.
Oberndorf William E holdings all 8 positions.
Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.
| Stock | % of 13F value | Share change | Reported value |
|---|---|---|---|
| UNHUnitedhealth Group Inc | 26.9% | +0.0% | $14.8M |
| GWREGuidewire Software Inc | 16.1% | +16.6% | $8.9M |
| AMZNAmazon Com Inc | 15.6% | +0.0% | $8.6M |
| VEEVVeeva Sys Inc | 14.6% | +0.0% | $8.0M |
| PHYSSprott Asset Management LP | 12.3% | +0.0% | $6.8M |
| GOOGAlphabet Inc | 8.2% | — | $4.5M |
| MNDYMonday Com Ltd | 4.8% | — | $2.7M |
| ADSKAutodesk Inc | 1.6% | -83.1% | $860K |
What Oberndorf William E bought and sold in Q2 2026, against Q1 2026.
New positions
- GOOG Alphabet Inc8.2% of 13F
- MNDY Monday Com Ltd4.8% of 13F
Added to
- GWRE Guidewire Software Inc+16.6% shares
Reduced
- ADSK Autodesk Inc-83.1% shares
Sold out
- TEAM Atlassian Corporationwas 9.0%
Share counts compared with the Q1 2026 13F; a split also changes share counts.
How the holdings did against the S&P 500.
- 1 year
- +5.2% /yr
- S&P 500 +20.1%
- 3 years
- +14.2% /yr
- S&P 500 +20.4%
- 5 years
- -3.2% /yr
- S&P 500 +11.6%
A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.
Reported 13F value by quarter.
| Quarter | 13F value | Positions |
|---|---|---|
| Q2 2026 | $55.0M | 8 |
| Q1 2026 | $53.3M | 7 |
| Q4 2025 | $79.0M | 7 |
| Q3 2025 | $74.2M | 7 |
| Q2 2025 | $90.5M | 8 |
| Q1 2025 | $77.9M | 8 |
| Q4 2024 | $59.9M | 6 |
| Q3 2024 | $75.4M | 8 |
| Q2 2024 | $57.0M | 9 |
| Q1 2024 | $61.3M | 9 |
| Q4 2023 | $61.4M | 10 |
| Q3 2023 | $54.7M | 9 |
Questions about Oberndorf William E's portfolio
What stocks does Oberndorf William E own?
Oberndorf William E's latest 13F, for Q2 2026 and filed Aug 13, 2026, lists 8 positions worth $55.0M. The largest are Unitedhealth Group Inc (UNH) at 26.9%, Guidewire Software Inc (GWRE) at 16.1%, Amazon Com Inc (AMZN) at 15.6%, Veeva Sys Inc (VEEV) at 14.6% and Sprott Asset Management LP (PHYS) at 12.3%.
What did Oberndorf William E buy last quarter?
In Q2 2026, Oberndorf William E added a new position in Alphabet Inc (GOOG), a new position in Monday Com Ltd (MNDY) and Guidewire Software Inc (GWRE) (+16.6% shares), compared with its Q1 2026 filing.
What did Oberndorf William E sell last quarter?
In Q2 2026, Oberndorf William E sold all of Atlassian Corporation (TEAM) and Autodesk Inc (ADSK) (-83.1% shares), compared with its Q1 2026 filing.
How has Oberndorf William E's portfolio performed?
A portfolio copying Oberndorf William E's 20 largest 13F holdings each quarter, from the day each filing was public, returned +14.2% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +5.2% against +20.1%. Over 5 years: -3.2% a year against +11.6%.
When is Oberndorf William E's next 13F filing due?
13F filings are due 45 days after each quarter ends. Oberndorf William E's filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.