PARTHENON LLC
SEC Form 13F institutional filer · CIK 0001088859
13F-HR · 98 reported holdings · 2026-03-31
Parthenon LLC is a registered investment advisor.
Reported long-US-equity value
$0.80B
Top-10 concentration
52.3%
PARTHENON LLC — $800M AUM allocation strategy
PARTHENON LLC files SEC Form 13F and reports $800M of long US equity value across 98 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 20.4%, followed by Communication Services 14.5% and Financials 12.4%.
The top 10 holdings account for 52% 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.
PARTHENON LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$800M
total across 98 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
52% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$PAYX +1.43K sh · −$4.78M+$T +530 sh · +$89.5K+$VOO +515 sh · −$121K
Biggest trims (shares)
−$NVDA −12.4K sh · −$2.37M−$SCHW −10.1K sh · −$1.22M−$MO −6.56K sh · −$18.2K
Added from nil (new positions)
None this quarter
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 & Services14.5%—
- Systems Software10.5%—
- Multi-Sector Holdings8.3%—
- Pharmaceuticals6.0%—
- Technology Hardware, Storage & Peripherals4.0%—
- Electronic Components3.9%—
- Integrated Oil & Gas3.7%—
- Consumer Staples Merchandise Retail3.6%—
- Other holdings45.5%—
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 |
|---|---|---|---|---|---|
| $MSFT | Microsoft Corporation | 228K | $84.3M | +399 | 10.5% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 138K | $66.3M | -271 | 8.3% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 157K | $45.2M | -2.03K | 5.6% |
| $META | Meta Platforms Inc | 67.6K | $38.7M | -897 | 4.8% |
| $GOOGL | Alphabet Inc | 113K | $32.4M | -4.5K | 4.0% |
| $AAPL | Apple Inc | 127K | $32.3M | -1.63K | 4.0% |
| $GLW | Corning Incorporated | 231K | $31.4M | -35 | 3.9% |
| $XOM | ExxonMobil Holdings Corporation | 175K | $29.7M | -1.02K | 3.7% |
| $JNJ | Johnson & Johnson | 121K | $29.5M | -1.47K | 3.7% |
| $WMT | Walmart Inc | 226K | $28.1M | -1.42K | 3.5% |
…and 88 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.
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