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OBERNDORF WILLIAM E

Location
San Francisco, CA
Portfolio Value
Micro $55,022,949
Diversification
Moderately concentrated
Filing Date
Global Rank
#7,068 / 8,676 ▲ 133
Top Industry
Healthcare Plans 26.9%
3Y Alpha vs SPY
-5.2%
Period ended 2 months ago
Filed Aug 13, 2026 · 19d
26 quarters · since Mar 2020

Clone Performance

Sep 2023–Sep 2026 · vs SPY

Hypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.

Cloned portfolio
+49.6%
SPY
+70.0%
Annualised alpha
-5.0%
Max drawdown
−36.2%

Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. Returns use comparable raw closes and exclude dividends. Captured split ratios restate closes onto one basis; only an unusable ratio can exclude earlier closes for that listing. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.

Portfolio Concentration

8 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026
Top Position
26.9%
+8.8 pts
Top 5
85.4%
+6.2 pts
Top 10
100.0%
0.0 pts
HHI
1,680
Sep 2023 → Jun 2026 · range 1,348 – 2,099
Moderately concentrated+194

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026
Sector % Portfolio Value
Healthcare 41.4% $22,790,195
Technology 22.5% $12,379,798
Consumer Cyclical 15.6% $8,587,628
Financial Services 12.3% $6,771,324
Communication Services 8.2% $4,494,004

Last Quarter's Activity

Export CSV
Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased
1 positions
Ticker Δ Shares Shares Value Open

Trimmed

Positions the filer reduced
1 positions
Ticker Δ Shares Shares Value Open

New Positions

Positions the filer opened this quarter
2 positions
Ticker Shares Value Open

Sold Out

Positions the filer fully exited
1 positions
Ticker Shares Value Open

Portfolio Positions

Export CSV View 13F filing
8 tracked positions · $55,022,949 total · filing declares 8 positions · $55,022,953 · as of Jun 30, 2026
Ticker Company Shares Value (USD) % of Portfolio History

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.