Rockbridge Asset Management LLC
SEC Form 13F institutional filer · CIK 0002056320
13F-HR · 21 reported holdings · 2026-03-31
Reported long-US-equity value
$0.12B
Top-10 concentration
88.7%
Rockbridge Asset Management LLC — $120M AUM allocation strategy
Rockbridge Asset Management LLC files SEC Form 13F and reports $120M of long US equity value across 21 reported holdings for 2026-03-31.
Its largest sector bet is Financials 22.9%, followed by Consumer Discretionary 22.0% and Industrials 18.2%.
The top 10 holdings account for 89% 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.
Rockbridge Asset Management LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$120M
total across 21 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
89% of value
higher = narrower conviction; lower = spread / hedging
Biggest trims (shares)
−$ORLY −16K sh · −$1.3M−$AMZN −12.3K sh · −$4.21M−$AMT −5.37K sh · −$1.19M
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)
- Transaction & Payment Processing Services13.2%—
- Telecom Tower REITs12.7%—
- Automotive Retail11.3%—
- Broadline Retail10.7%—
- Systems Software9.6%—
- Multi-Sector Holdings9.2%—
- Aerospace & Defense8.3%—
- Diversified Support Services7.7%—
- Other holdings17.4%—
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 |
|---|---|---|---|---|---|
| $AMT | American Tower Corporation | 83K | $14.3M | -5.37K | 12.0% |
| $ORLY | O'Reilly Automotive Inc | 146K | $13.5M | -16K | 11.3% |
| $AMZN | Amazon.com Inc | 61.3K | $12.8M | -12.3K | 10.7% |
| $MSFT | Microsoft Corporation | 30.8K | $11.4M | -2.85K | 9.6% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 22.9K | $11M | -1.52K | 9.2% |
| $LMT | Lockheed Martin Corporation | 15.9K | $9.63M | -1.32K | 8.1% |
| $CPRT | Copart Inc | 276K | $9.16M | +14.9K | 7.7% |
| $AAPL | Apple Inc | 33.8K | $8.58M | -2.39K | 7.2% |
| $MA | Mastercard Incorporated | 16.5K | $8.27M | -1.64K | 6.9% |
| $V | Visa Inc | 24.6K | $7.44M | +4.59K | 6.2% |
…and 11 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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