MAIRS & POWER INC
SEC Form 13F institutional filer · CIK 0001070134
13F-HR · 152 reported holdings · 2026-03-31
Investment advisor.
Reported long-US-equity value
$7.67B
Top-10 concentration
54.5%
MAIRS & POWER INC — $7.67B AUM allocation strategy
MAIRS & POWER INC files SEC Form 13F and reports $7.67B of long US equity value across 152 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 27.3%, followed by Communication Services 10.6% and Health Care 10.2%.
The top 10 holdings account for 55% 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.
MAIRS & POWER INC — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$7.67B
total across 152 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
55% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$FISV +510K sh · +$9.75M+$WM +397K sh · +$91.3M+$PANW +312K sh · +$44.8M
Biggest trims (shares)
−$KHC −1.36M sh · −$33.4M−$FAST −745K sh · −$5.31M−$HRL −372K sh · −$12.4M
Exited to nil (held last quarter, gone now)
$XLI ($1.63M last qtr)$XLP ($1.56M last qtr)$XLF ($1.39M last qtr)$XLV ($855K last qtr)$XLB ($239K last qtr)
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)
- Semiconductors10.8%—
- Systems Software9.4%—
- Interactive Media & Services8.4%—
- Broadline Retail7.1%—
- Pharmaceuticals5.8%—
- Electric Utilities5.6%—
- Specialty Chemicals4.5%—
- Diversified Banks4.1%—
- Other holdings44.4%—
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 |
|---|---|---|---|---|---|
| $NVDA | NVIDIA Corporation | 4.76M | $830M | -188K | 10.8% |
| $MSFT | Microsoft Corporation | 1.94M | $719M | +29.5K | 9.4% |
| $AMZN | Amazon.com Inc | 2.6M | $542M | +10.1K | 7.1% |
| $GOOGL | Alphabet Inc | 1.61M | $462M | -86.4K | 6.0% |
| $JPM | JP Morgan Chase & Co | 1.05M | $310M | -222K | 4.0% |
| $AAPL | Apple Inc | 1.21M | $307M | -9.09K | 4.0% |
| $LLY | Eli Lilly and Company | 326K | $300M | -19K | 3.9% |
| $V | Visa Inc | 841K | $254M | +38.4K | 3.3% |
| $MSI | Motorola Solutions Inc | 541K | $235M | +15.5K | 3.1% |
| $WEC | WEC Energy Group Inc | 1.91M | $221M | +1.91K | 2.9% |
…and 142 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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