Penbrook Management LLC
SEC Form 13F institutional filer · CIK 0001381055
13F-HR · 34 reported holdings · 2026-03-31
Reported long-US-equity value
$0.06B
Top-10 concentration
75.4%
Penbrook Management LLC — $61.5M AUM allocation strategy
Penbrook Management LLC files SEC Form 13F and reports $61.5M of long US equity value across 34 reported holdings for 2026-03-31.
Its largest sector bet is Communication Services 25.4%, followed by Consumer Discretionary 19.3% and Information Technology 18.8%.
The top 10 holdings account for 75% of reported value — a conviction-weighted book concentrated in its best ideas. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
Penbrook Management LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$61.5M
total across 34 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
75% of value
higher = narrower conviction; lower = spread / hedging
Biggest trims (shares)
−$FIS −14.4K sh · −$898K−$VZ −1.24K sh · +$233K−$QQQ −945 sh · −$615K
Exited to nil (held last quarter, gone now)
$SYF ($1.29M last qtr)$GPN ($396K last qtr)$AFL ($215K last qtr)$JPM ($213K last qtr)
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Interactive Media & Services23.0%—
- Broadline Retail17.5%—
- Systems Software13.4%—
- Financial Exchanges & Data9.6%—
- Oil & Gas Storage & Transportation6.8%—
- Asset Management & Custody Banks3.4%—
- Semiconductors3.1%—
- Multi-Sector Holdings2.6%—
- Other holdings20.7%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
10 of 10 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $AMZN | Amazon.com Inc | 51.8K | $10.8M | +0 | 17.5% |
| $MSFT | Microsoft Corporation | 22.2K | $8.23M | -505 | 13.4% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 23.2K | $6.66M | +0 | 10.8% |
| $GOOGL | Alphabet Inc | 22.6K | $6.47M | +0 | 10.5% |
| $MCO | Moody's Corporation | 13.6K | $5.93M | +0 | 9.6% |
| $BX | Blackstone Inc | 18.1K | $2.09M | +3.35K | 3.4% |
| $TRGP | Targa Resources Inc | 6.89K | $1.73M | -136 | 2.8% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 3.3K | $1.58M | -50 | 2.6% |
| $VZ | Verizon Communications Inc | 29.9K | $1.5M | -1.24K | 2.4% |
| $CSCO | Cisco Systems Inc | 18.4K | $1.42M | +0 | 2.3% |
…and 24 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
← All 13F filers·← QuantOrb.pro
How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
Newsletter signup
Free subscription. Daily trading day morning dispatch. No spam.