MAIRS & POWER INC 13F: Quarter-over-Quarter Portfolio Changes
MAIRS & POWER INC reported a disclosed portfolio value of approximately $9.8 billion in its latest SEC Form 13F-HR filing for Q1 2026, down 5.8% quarter on quarter. Over the quarter, the manager initiated 21 new positions, bought more shares in 62 holdings, trimmed 107 holdings, and exited 19 positions.
MAIRS & POWER INC's top buy was Waste Management INC (WM) . The manager bought 39724.0% more shares, lifting the position's portfolio weight by 0.9 percentage points. Its top sell was Piper Sandler Companies (62C) . The manager exited the position completely after it had accounted for 0.6% of the previous portfolio.
New PositionsQ1 2026
Securities disclosed for the first time in Q1 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Portfolio Weight | History |
|---|---|---|---|
| PIPER SANDLER COMPANIES | PIPR | 0.4% | Holders → |
| SPROUTS FMRS MKT INC | SFM | 0.2% | Holders → |
| VANGUARD INDEX FDS | VOO | 0.1% | Holders → |
| AMBARELLA INC | AMBA | 0.1% | Holders → |
| API GROUP CORP | APG | 0.0% | Holders → |
| SOLSTICE ADVANCED MATLS INC | SOLS | 0.0% | Holders → |
| VANGUARD INTL EQUITY INDEX F | VWO | 0.0% | Holders → |
| INVESCO EXCHANGE TRADED FD T | RSP | 0.0% | Holders → |
| VANGUARD SCOTTSDALE FDS | VONE | 0.0% | Holders → |
| VANGUARD SCOTTSDALE FDS | VGLT | 0.0% | Holders → |
| SPDR GOLD TR | GLD | 0.0% | Holders → |
| STATE STR SPDR S&P MIDCAP 40 | MDY | 0.0% | Holders → |
| ISHARES TR | USMV | 0.0% | Holders → |
| WATERS CORP | WAT | 0.0% | Holders → |
| MICRON TECHNOLOGY INC | MU | 0.0% | Holders → |
| VANGUARD WORLD FD | VGT | 0.0% | Holders → |
| UNITED THERAPEUTICS CORP DEL | UTHR | 0.0% | Holders → |
| MURPHY OIL CORP | MUR | 0.0% | Holders → |
| ANALOG DEVICES INC | ADI | 0.0% | Holders → |
| TIMKEN CO | TKR | 0.0% | Holders → |
| SNAP INC | SNAP | 0.0% | Holders → |
Top BuysQ1 2026
Showing the top 10 buys among 62 existing positions where the manager bought more shares in Q1 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| WASTE MANAGEMENT INC | WM | +0.9% | +39724.0% | Holders → |
| VANGUARD TAX-MANAGED FDS | VEA | +0.0% | +782.0% | Holders → |
| VANGUARD INDEX FDS | VO | +0.0% | +424.9% | Holders → |
| AMERIPRISE FINANCIAL, INC. | AMP | +0.7% | +362.4% | Holders → |
| VANGUARD INDEX FDS | VB | +0.0% | +288.0% | Holders → |
| BENTLEY SYS INC | BSY | +0.1% | +184.6% | Holders → |
| JAMES HARDIE INDS PLC | JHX | +0.0% | +165.5% | Holders → |
| UIPATH INC | PATH | +0.0% | +153.2% | Holders → |
| PALO ALTO NETWORKS INC | PANW | +0.5% | +141.4% | Holders → |
| XYLEM INC | XYL | +0.0% | +136.0% | Holders → |
Top SellsQ1 2026
Showing the top 10 sells among 107 existing positions where the manager sold shares in Q1 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| SKYWATER TECHNOLOGY INC | SKYT | -0.0% | 92.9% | Holders → |
| SALESFORCE INC | CRM | -0.7% | 83.1% | Holders → |
| KRAFT HEINZ CO | KHC | -0.3% | 81.1% | Holders → |
| AMCOR PLC | AMCR | -0.0% | 80.6% | Holders → |
| ULTA BEAUTY INC | ULTA | -0.0% | 66.6% | Holders → |
| HUB GROUP INC | HUBG | -0.0% | 32.2% | Holders → |
| SYSCO CORP | SYY | -0.0% | 28.3% | Holders → |
| JOHNSON & JOHNSON | JNJ | -0.2% | 28.2% | Holders → |
| ZIMMER BIOMET HOLDINGS INC | ZBH | -0.0% | 27.5% | Holders → |
| OLD NATL BANCORP IND | ONB | -0.0% | 26.6% | Holders → |
Full ExitsQ1 2026
Positions present in the prior 13F-HR filing that no longer appear in Q1 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| PIPER SANDLER COMPANIES | 62C | 0.6% |
| INSPIRE MEDICAL SYSTEMS INC | INSP | 0.1% |
| MGP INGREDIENTS INC NEW | MGPI | 0.0% |
| CLEARWATER ANALYTICS HOLDINGS INC | CWAN | 0.0% |
| GENTHERM INC | THRM | 0.0% |
| EXACT SCIENCES CORP | EXK | 0.0% |
| SELECT SECTOR SPDR TR | XLI | 0.0% |
| SELECT SECTOR SPDR TR | XLP | 0.0% |
| SS FINANCIAL SELECT SECTOR | XLF | 0.0% |
| CVRX INC | CVRX | 0.0% |
| SELECT SECTOR SPDR TR | XLV | 0.0% |
| SS MATERIALS SELECT SECTOR | XLB | 0.0% |
| AUTODESK INC | ADSK | 0.0% |
| VANGUARD MUN BD FDS | VTEB | 0.0% |
| REGIONS FINANCIAL CORP NEW | RF | 0.0% |
| EATON CORP PLC | ETN | 0.0% |
| NOVARTIS AG | NVS | 0.0% |
| BLACKROCK INC | BLK | 0.0% |
| SONY GROUP CORP | SONY | 0.0% |
Net Portfolio Value ChangeQ1 2026
- $10.4BPrior quarter
- $9.8BCurrent quarter
- $-0.6BNet delta
- -5.8%% change
Methodology & FAQ
How MAIRS & POWER INC Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for MAIRS & POWER INC: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description — including how confidential treatment filings are handled — is documented in the Methodology.
What stocks did MAIRS & POWER INC buy in Q1 2026?
In Q1 2026, MAIRS & POWER INC initiated 21 new positions (PIPER SANDLER COMPANIES (PIPR), SPROUTS FMRS MKT INC (SFM), VANGUARD INDEX FDS (VOO), AMBARELLA INC (AMBA), API GROUP CORP (APG), SOLSTICE ADVANCED MATLS INC (SOLS), VANGUARD INTL EQUITY INDEX F (VWO), INVESCO EXCHANGE TRADED FD T (RSP), VANGUARD SCOTTSDALE FDS (VONE), VANGUARD SCOTTSDALE FDS (VGLT), SPDR GOLD TR (GLD), STATE STR SPDR S&P MIDCAP 40 (MDY), ISHARES TR (USMV), WATERS CORP (WAT), MICRON TECHNOLOGY INC (MU), VANGUARD WORLD FD (VGT), UNITED THERAPEUTICS CORP DEL (UTHR), MURPHY OIL CORP (MUR), ANALOG DEVICES INC (ADI), TIMKEN CO (TKR), SNAP INC (SNAP)); bought more shares of WASTE MANAGEMENT INC (WM), VANGUARD TAX-MANAGED FDS (VEA), VANGUARD INDEX FDS (VO), AMERIPRISE FINANCIAL, INC. (AMP), VANGUARD INDEX FDS (VB) — the largest 5 of 62 adds.
What stocks did MAIRS & POWER INC sell in Q1 2026?
In Q1 2026, MAIRS & POWER INC fully sold 19 positions (PIPER SANDLER COMPANIES (62C), INSPIRE MEDICAL SYSTEMS INC (INSP), MGP INGREDIENTS INC NEW (MGPI), CLEARWATER ANALYTICS HOLDINGS INC (CWAN), GENTHERM INC (THRM), EXACT SCIENCES CORP (EXK), SELECT SECTOR SPDR TR (XLI), SELECT SECTOR SPDR TR (XLP), SS FINANCIAL SELECT SECTOR (XLF), CVRX INC (CVRX), SELECT SECTOR SPDR TR (XLV), SS MATERIALS SELECT SECTOR (XLB), AUTODESK INC (ADSK), VANGUARD MUN BD FDS (VTEB), REGIONS FINANCIAL CORP NEW (RF), EATON CORP PLC (ETN), NOVARTIS AG (NVS), BLACKROCK INC (BLK), SONY GROUP CORP (SONY)); reduced holdings in SKYWATER TECHNOLOGY INC (SKYT), SALESFORCE INC (CRM), KRAFT HEINZ CO (KHC), AMCOR PLC (AMCR), ULTA BEAUTY INC (ULTA) — the largest 5 of 107 reductions.
Which positions did MAIRS & POWER INC initiate in Q1 2026?
MAIRS & POWER INC established 21 new positions in Q1 2026: PIPER SANDLER COMPANIES (PIPR, 0.4%), SPROUTS FMRS MKT INC (SFM, 0.2%), VANGUARD INDEX FDS (VOO, 0.1%), AMBARELLA INC (AMBA, 0.1%), API GROUP CORP (APG, 0.0%), SOLSTICE ADVANCED MATLS INC (SOLS, 0.0%), VANGUARD INTL EQUITY INDEX F (VWO, 0.0%), INVESCO EXCHANGE TRADED FD T (RSP, 0.0%), VANGUARD SCOTTSDALE FDS (VONE, 0.0%), VANGUARD SCOTTSDALE FDS (VGLT, 0.0%), SPDR GOLD TR (GLD, 0.0%), STATE STR SPDR S&P MIDCAP 40 (MDY, 0.0%), ISHARES TR (USMV, 0.0%), WATERS CORP (WAT, 0.0%), MICRON TECHNOLOGY INC (MU, 0.0%), VANGUARD WORLD FD (VGT, 0.0%), UNITED THERAPEUTICS CORP DEL (UTHR, 0.0%), MURPHY OIL CORP (MUR, 0.0%), ANALOG DEVICES INC (ADI, 0.0%), TIMKEN CO (TKR, 0.0%), SNAP INC (SNAP, 0.0%).
Which existing positions saw the largest allocation increases for MAIRS & POWER INC in Q1 2026?
Of 62 existing positions with share-count increases in Q1 2026, the largest were: WASTE MANAGEMENT INC (WM, +0.9% weight, +39724.0% shares), VANGUARD TAX-MANAGED FDS (VEA, +0.0% weight, +782.0% shares), VANGUARD INDEX FDS (VO, +0.0% weight, +424.9% shares), AMERIPRISE FINANCIAL, INC. (AMP, +0.7% weight, +362.4% shares), VANGUARD INDEX FDS (VB, +0.0% weight, +288.0% shares), BENTLEY SYS INC (BSY, +0.1% weight, +184.6% shares), JAMES HARDIE INDS PLC (JHX, +0.0% weight, +165.5% shares), UIPATH INC (PATH, +0.0% weight, +153.2% shares), PALO ALTO NETWORKS INC (PANW, +0.5% weight, +141.4% shares), XYLEM INC (XYL, +0.0% weight, +136.0% shares).
Which positions did MAIRS & POWER INC fully exit in Q1 2026?
MAIRS & POWER INC fully exited 19 positions in Q1 2026: PIPER SANDLER COMPANIES (62C, last-reported weight 0.6%), INSPIRE MEDICAL SYSTEMS INC (INSP, last-reported weight 0.1%), MGP INGREDIENTS INC NEW (MGPI, last-reported weight 0.0%), CLEARWATER ANALYTICS HOLDINGS INC (CWAN, last-reported weight 0.0%), GENTHERM INC (THRM, last-reported weight 0.0%), EXACT SCIENCES CORP (EXK, last-reported weight 0.0%), SELECT SECTOR SPDR TR (XLI, last-reported weight 0.0%), SELECT SECTOR SPDR TR (XLP, last-reported weight 0.0%), SS FINANCIAL SELECT SECTOR (XLF, last-reported weight 0.0%), CVRX INC (CVRX, last-reported weight 0.0%), SELECT SECTOR SPDR TR (XLV, last-reported weight 0.0%), SS MATERIALS SELECT SECTOR (XLB, last-reported weight 0.0%), AUTODESK INC (ADSK, last-reported weight 0.0%), VANGUARD MUN BD FDS (VTEB, last-reported weight 0.0%), REGIONS FINANCIAL CORP NEW (RF, last-reported weight 0.0%), EATON CORP PLC (ETN, last-reported weight 0.0%), NOVARTIS AG (NVS, last-reported weight 0.0%), BLACKROCK INC (BLK, last-reported weight 0.0%), SONY GROUP CORP (SONY, last-reported weight 0.0%).
Which existing positions saw the largest allocation reductions for MAIRS & POWER INC in Q1 2026?
Of 107 existing positions with share-count reductions in Q1 2026, the largest were: SKYWATER TECHNOLOGY INC (SKYT, -0.0% weight, -92.9% shares), SALESFORCE INC (CRM, -0.7% weight, -83.1% shares), KRAFT HEINZ CO (KHC, -0.3% weight, -81.1% shares), AMCOR PLC (AMCR, -0.0% weight, -80.6% shares), ULTA BEAUTY INC (ULTA, -0.0% weight, -66.6% shares), HUB GROUP INC (HUBG, -0.0% weight, -32.2% shares), SYSCO CORP (SYY, -0.0% weight, -28.3% shares), JOHNSON & JOHNSON (JNJ, -0.2% weight, -28.2% shares), ZIMMER BIOMET HOLDINGS INC (ZBH, -0.0% weight, -27.5% shares), OLD NATL BANCORP IND (ONB, -0.0% weight, -26.6% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.