13F
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Stockbridge Partners LLC

13F equity value
$4.1B
Positions
16
Top 10 concentration
89.7%
Quarters / total new picks
22 / 44
13F equity value over time
$0M$3B$5B2017201820192020202120222023202420252026

"13F equity value" = market value of this filer's US-listed long equity positions only. It excludes cash, bonds, non-US and short positions, so it understates a fund's true assets under management — often by a lot.

Not significant Verdict

13F holdings are disclosed ~45 days after quarter-end, and they never reveal when within the quarter a fund actually bought. So any 13F-based summary is structurally late and blurred — this applies to every fund, including this one.

We backtested copying it anyway. Buying this fund's new positions the day each filing went public, over 22 quarters, returned +4.2% per quarter — versus +2.2% per quarter from simply owning every 13F stock. It beat that baseline in only 59.1% of quarters (excess t = 0.13, not statistically significant). Its filings tell you what it bought — not what you should buy.

Avg 2Q excess
+0.8%
t-stat
0.13
Quarterly win rate
59%
Annualized excess
-0.3%
$1 → follow vs universe
$1.44 vs $1.46
Cumulative return: $1 invested in new picks vs universe
1.00 20180331: universe 1.04120190331: universe 1.02320191231: universe 0.82520200331: universe 0.99520200630: universe 1.09920201231: universe 1.14920210331: universe 1.15920210930: universe 1.04120211231: universe 0.88620220331: universe 0.95120220930: universe 1.02120221231: universe 0.94920230331: universe 0.99920230630: universe 0.96420230930: universe 1.09420231231: universe 1.14320240630: universe 1.24720240930: universe 1.23620241231: universe 1.15320250331: universe 1.25720250930: universe 1.41420251231: universe 1.463 20180331: follow 1.10620190331: follow 1.20620191231: follow 1.36920200331: follow 1.40520200630: follow 1.40820201231: follow 1.30420210331: follow 1.55320210930: follow 0.79020211231: follow 0.41220220331: follow 0.42920220930: follow 0.56320221231: follow 0.58720230331: follow 0.48320230630: follow 0.49920230930: follow 0.58020231231: follow 0.59720240630: follow 0.66420240930: follow 0.79020241231: follow 0.81320250331: follow 0.84220250930: follow 1.09420251231: follow 1.438 0.38 1.03 1.68 20182019202020212022202320242025 Follow Universe

Quarterly compounding, invested quarters only · entry 47 days after quarter-end (when 13F data becomes public)

Listed as facts. See the verdict above before treating this as signal.

Top 16 holdings of 16 · 2026 Q1

Ticker Value Weight QoQ
TSM $727M
17.6%
HOLD
AMZN $515M
12.4%
ADD
TDG $503M
12.2%
HOLD
WCN $398M
9.6%
ADD
DE $318M
7.7%
TRIM
VMC $311M
7.5%
TRIM
GOOGL $281M
6.8%
ADD
NVDA $267M
6.5%
NEW
KLAC $196M
4.7%
TRIM
MSFT $195M
4.7%
TRIM
ALSN $121M
2.9%
NEW
MA $103M
2.5%
NEW
V $102M
2.5%
NEW
FWONK $62M
1.5%
NEW
GWRE $20M
0.5%
TRIM
MLM $19M
0.5%
NEW

QoQ vs previous quarter's share count · NEW = new position · ADD/TRIM = ±2% shares · HOLD = unchanged.

Listed as facts. See the verdict above before treating this as signal.

New positions in 2026 Q1

ALSNFWONKMAMLMNVDAV

Method & Limitations

Method: a "new position" = held this quarter, absent last quarter (options excluded; stocks with <50 prior holders excluded to filter spin-off artifacts). Entry 47 days after quarter-end — the first day the public could act on the filing. Benchmark = equal-weighted universe of all 13F-held stocks. Limitations: quarterly snapshots can't see intra-quarter trades; survivorship bias — funds that shut down are absent, which flatters the sample. Statistics, not advice.