O'Brien Greene & Co. Inc
SEC Form 13F institutional filer · CIK 0001768635
13F-HR · 71 reported holdings · 2026-03-31
Reported long-US-equity value
$0.24B
Top-10 concentration
53.5%
O'Brien Greene & Co. Inc — $239M AUM allocation strategy
O'Brien Greene & Co. Inc files SEC Form 13F and reports $239M of long US equity value across 71 reported holdings for 2026-03-31.
Its largest sector bet is Financials 21.9%, followed by Energy 16.3% and Information Technology 13.5%.
The top 10 holdings account for 54% 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.
O'Brien Greene & Co. Inc — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$239M
total across 71 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
54% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$VLTO +3.31K sh · −$452K+$DHR +1.96K sh · −$1.14M+$EOG +1.91K sh · +$3.5M
Biggest trims (shares)
−$BEN −25.3K sh · +$2.47M−$FDX −12.3K sh · −$3.48M−$IBKR −6.56K sh · +$276K
Exited to nil (held last quarter, gone now)
$BR ($6.99M last qtr)$PYPL ($244K last qtr)$IBM ($207K last qtr)$CRM ($203K 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)
- Investment Banking & Brokerage7.1%—
- Consumer Staples Merchandise Retail6.8%—
- Asset Management & Custody Banks6.1%—
- Technology Hardware, Storage & Peripherals5.9%—
- Multi-Sector Holdings5.6%—
- Oil & Gas Refining & Marketing5.2%—
- Oil & Gas Exploration & Production5.0%—
- Oil & Gas Storage & Transportation4.7%—
- Other holdings53.6%—
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 |
|---|---|---|---|---|---|
| $IBKR | Interactive Brokers Group Inc | 253K | $17M | -6.56K | 7.1% |
| $BEN | Franklin Templeton Inc | 609K | $14.6M | -25.3K | 6.1% |
| $AAPL | Apple Inc | 55.3K | $14M | +493 | 5.9% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 27.8K | $13.3M | -85 | 5.6% |
| $WMT | Walmart Inc | 102K | $12.7M | -1.92K | 5.3% |
| $VLO | Valero Energy Corporation | 50.6K | $12.5M | +1.2K | 5.2% |
| $EOG | EOG Resources Inc | 83.4K | $12.1M | +1.91K | 5.0% |
| $WMB | Williams Companies Inc | 155K | $11.3M | -463 | 4.7% |
| $AMGN | Amgen Inc | 29.6K | $10.4M | -36 | 4.4% |
| $CSCO | Cisco Systems Inc | 130K | $10.1M | -3.1K | 4.2% |
…and 61 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
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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.
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