Stockbridge Partners LLC
SEC Form 13F institutional filer · CIK 0001505183
13F-HR · 11 reported holdings · 2026-03-31
Hedge fund manager.
Reported long-US-equity value
$2.81B
Top-10 concentration
99.3%
Stockbridge Partners LLC — $2.81B AUM allocation strategy
Stockbridge Partners LLC files SEC Form 13F and reports $2.81B of long US equity value across 11 reported holdings for 2026-03-31.
Its largest sector bet is Industrials 29.2%, followed by Information Technology 23.4% and Consumer Discretionary 18.3%.
The top 10 holdings account for 99% 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.
Stockbridge Partners LLC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$2.81B
total across 11 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
99% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$AMZN +499K sh · +$59.4M+$GOOG +51.1K sh · −$8.85M+$TDG +1 sh · −$74.2M
Biggest trims (shares)
−$MSFT −223K sh · −$167M−$DE −213K sh · −$44.1M−$VMC −175K sh · −$64.8M
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)
- Broadline Retail18.3%—
- Aerospace & Defense17.9%—
- Construction Materials11.7%—
- Agricultural & Farm Machinery11.3%—
- Interactive Media & Services10.0%—
- Semiconductors9.5%—
- Transaction & Payment Processing Services7.3%—
- Semiconductor Materials & Equipment7.0%—
- Other holdings7.0%—
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 | 2.47M | $515M | +499K | 18.3% |
| $TDG | Transdigm Group Incorporated | 434K | $503M | +1 | 17.9% |
| $DE | Deere & Company | 565K | $318M | -213K | 11.3% |
| $VMC | Vulcan Materials Company | 1.14M | $311M | -175K | 11.1% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 976K | $281M | +51.1K | 10.0% |
| $NVDA | NVIDIA Corporation | 1.53M | $267M | — | 9.5% |
| $KLAC | KLA Corporation | 133K | $196M | -19.7K | 7.0% |
| $MSFT | Microsoft Corporation | 526K | $195M | -223K | 6.9% |
| $MA | Mastercard Incorporated | 206K | $103M | — | 3.7% |
| $V | Visa Inc | 337K | $102M | — | 3.6% |
…and 1 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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