Stembrook Asset Management, LLC
CIK
2109734
Location
RED BANK, NJ
Portfolio Value
Micro
$1,425,490
Diversification
Highly concentrated
Filing Date
Global Rank
#5,987
/ 8,232
▲ 193
Top Industry
Consumer Electronics
69.5%
3Y Alpha vs SPY
+9.4%
Period ended 3 months ago
Filed May 13, 2026 · 33d
2 quarters · since Dec 2025
Clone Performance
Feb 2026–Jun 2026 · vs SPYHypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.
Cloned portfolio
+11.6%
SPY
+9.1%
Annualised alpha
+9.3%
Max drawdown
−8.8%
Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.
Portfolio Concentration
39 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Top Position
50.4%
−0.7 pts
Top 5
82.2%
−0.3 pts
Top 10
86.9%
−0.5 pts
HHI
3,160
Highly concentrated−50
Portfolio Trend
2 quarters · across all stocks
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Technology | 54.3% | $38,172,508 |
| Unclassified | 27.5% | $19,335,986 |
| Financial Services | 5.4% | $3,801,152 |
| Healthcare | 2.6% | $1,814,997 |
| Industrials | 2.5% | $1,770,883 |
| Communication Services | 2.4% | $1,670,723 |
| Energy | 2.0% | $1,425,490 |
| Consumer Defensive | 1.7% | $1,221,215 |
| Consumer Cyclical | 1.6% | $1,138,338 |
Last Quarter's Activity
Export CSVTrimmed
Positions the filer reduced
1 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| BRK-B | Berkshire Hathaway Inc | −60 | 2,878 | $1,379,137 | |
| No positions match the current search. | |||||
3 positions ·
$1,425,490 total
· Energy only
· as of Mar 31, 2026
All sectors
Communication Services
Consumer Cyclical
Consumer Defensive
Energy
Financial Services
Healthcare
Industrials
Technology