13F
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MAIRS & POWER INC

13F equity value
$9.8B
Positions
245
Top 10 concentration
44.0%
Quarters / total new picks
31 / 257
13F equity value over time
$0M$5B$11B2017201820192020202120222023202420252026

"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 31 quarters, returned +3.6% per quarter — versus +2.2% per quarter from simply owning every 13F stock. It beat that baseline in only 58.1% of quarters (excess t = 0.45, not statistically significant). Its filings tell you what it bought — not what you should buy.

Avg 2Q excess
+1.3%
t-stat
0.45
Quarterly win rate
58%
Annualized excess
+4.0%
$1 → follow vs universe
$2.29 vs $1.73
Cumulative return: $1 invested in new picks vs universe
1.00 20180331: universe 1.04120180630: universe 0.95920180930: universe 1.00320181231: universe 0.99220190331: universe 0.97520190630: universe 1.04820190930: universe 1.12720191231: universe 0.90920200630: universe 1.00420200930: universe 1.23220201231: universe 1.28820210331: universe 1.29920210630: universe 1.40320210930: universe 1.26020211231: universe 1.07220220331: universe 1.15120220630: universe 1.06620220930: universe 1.14520221231: universe 1.06420230331: universe 1.12120230630: universe 1.08120230930: universe 1.22720231231: universe 1.28220240331: universe 1.31020240630: universe 1.42920240930: universe 1.41720241231: universe 1.32320250331: universe 1.44220250630: universe 1.48720250930: universe 1.67220251231: universe 1.730 20180331: follow 1.07520180630: follow 1.07920180930: follow 1.15820181231: follow 1.11620190331: follow 1.19820190630: follow 1.49320190930: follow 1.70420191231: follow 1.41520200630: follow 1.54420200930: follow 1.75320201231: follow 1.72920210331: follow 1.71820210630: follow 1.88520210930: follow 1.64520211231: follow 1.41620220331: follow 1.41920220630: follow 0.89320220930: follow 0.95420221231: follow 0.96020230331: follow 1.03720230630: follow 1.16920230930: follow 1.13820231231: follow 1.15820240331: follow 1.09720240630: follow 1.41820240930: follow 1.59620241231: follow 1.50120250331: follow 1.79220250630: follow 2.12720250930: follow 2.43920251231: follow 2.292 0.82 1.73 2.63 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 20 holdings of 245 · 2026 Q1

Ticker Value Weight QoQ
NVDA $830M
8.5%
TRIM
MSFT $719M
7.3%
HOLD
AMZN $542M
5.5%
HOLD
GOOG $462M
4.7%
TRIM
GGG $323M
3.3%
TRIM
JPM $310M
3.2%
TRIM
AAPL $307M
3.1%
HOLD
LLY $300M
3.1%
TRIM
V $254M
2.6%
ADD
TTC $254M
2.6%
TRIM
LFUS $246M
2.5%
TRIM
NVT $244M
2.5%
TRIM
MSI $235M
2.4%
ADD
WEC $221M
2.3%
HOLD
LNT $207M
2.1%
TRIM
ECL $203M
2.1%
HOLD
UNH $201M
2.1%
TRIM
META $186M
1.9%
ADD
FAST $182M
1.9%
TRIM
VZ $166M
1.7%
HOLD

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

ADIAMBAAMCRAPGGLDMDYMUMURRSPSFMSNAPSOLSTKRUSMVUTHRVGLTVGTVONEVOOVWOWAT

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.