Mairs & Power
Based on Q4 2025 SEC Form 13F filings, Mairs & Power manages a portfolio with 243 disclosed long equity positions. The fund's 13F market value sits at $10.40B, reflecting a decline in quarter-over-quarter AUM. Ranked by portfolio weight, the top holdings are MICROSOFT CORP (MSFT) at 8.90%, NVIDIA CORPORATION (NVDA) at 8.88%, and AMAZON COM INC (AMZN) at 5.76%. The fund is primarily focused on the Technology sector. New positions this quarter include INTUITIVE SURGICAL INC (ISRG) , BENTLEY SYS INC (BSY) , JAMES HARDIE INDS PLC (JHX) , SELECT SECTOR SPDR TR (XLI) , and SELECT SECTOR SPDR TR (XLP) . Fully exited positions include JAMF HLDG CORP (SYN_47074L105) , STATE STR SPDR S&P MIDCAP 40 (MDY) , ISHARES TR (SYN_46436E866) , VANGUARD SCOTTSDALE FDS (VONE) , and MONDELEZ INTL INC (MDLZ) . Ranked by the share of each peer fund's 13F equity portfolio that overlaps with Mairs & Power's disclosed positions as of Q4 2025, the closest peers are Trustees of Columbia University in the City of New York (99.6%), H&H International Investment (86.9%), and Berkshire Hathaway (82.4% overlap).
- 13F AUM
- $10.4B
- Equity Positions
- 243
- Top-10 Concentration
- 47.8%
- Largest Sector · 31.8%
- Technology
- Longest held · 40 qtrs
- AAPL
- Median Holding Period
- 14 Qtrs
Top 10 HoldingsQ4 2025
Ranked by portfolio weight. Δ QoQ is the change in weight versus the previous reporting quarter.
| # | Ticker | Company | Sector | Shares | Weight | Δ QoQ | Market Value |
|---|---|---|---|---|---|---|---|
| 1 | MSFT | Technology | 1,912,896 | 8.90% | -0.37% | $925.1M | |
| 2 | NVDA | Technology | 4,949,648 | 8.88% | -0.89% | $923.1M | |
| 3 | AMZN | Consumer Cyclical | 2,592,768 | 5.76% | +0.49% | $598.5M | |
| 4 | GOOG | Communication Services | 1,697,969 | 5.13% | +1.09% | $532.8M | |
| 5 | JPM | Financial Services | 1,276,404 | 3.96% | -0.08% | $411.3M | |
| 6 | LLY | Healthcare | 345,345 | 3.57% | +1.00% | $371.1M | |
| 7 | AAPL | Technology | 1,217,486 | 3.19% | +0.35% | $331.0M | |
| 8 | GGG | Industrials | 3,905,582 | 3.08% | -0.06% | $320.1M | |
| 9 | V | Financial Services | 802,518 | 2.71% | +0.17% | $281.5M | |
| 10 | UNH | Healthcare | 830,535 | 2.64% | -0.83% | $274.2M |
Quarterly shiftsvs previous quarter
Top movers in Mairs & Power's Form 13F versus the prior reporting quarter. Δ Weight is the change in portfolio weight (percentage points); Δ Shares is the percent change in share count.
| Company | Ticker | Δ Weight | Δ Shares |
|---|---|---|---|
| ALPHABET INC | GOOG | +1.09% | -3.67% |
| ELI LILLY & CO | LLY | +1.00% | -3.58% |
| AMAZON COM INC | AMZN | +0.49% | +1.44% |
| APPLE INC | AAPL | +0.35% | +2.94% |
| ZOETIS INC | ZTS | +0.27% | +15094.63% |
| Company | Ticker | Δ Weight | Δ Shares |
|---|---|---|---|
| FISERV, INC. | FISV | -1.06% | -6.10% |
| NVIDIA CORPORATION | NVDA | -0.89% | -11.24% |
| UNITEDHEALTH GROUP INC | UNH | -0.83% | -22.38% |
| MICROSOFT CORP | MSFT | -0.37% | +0.39% |
| FASTENAL CO | FAST | -0.37% | -1.09% |
| Company | Ticker | New weight |
|---|---|---|
| INTUITIVE SURGICAL INCNEW | ISRG | 0.34% |
| BENTLEY SYS INCNEW | BSY | 0.03% |
| JAMES HARDIE INDS PLCNEW | JHX | 0.02% |
| SELECT SECTOR SPDR TRNEW | XLI | 0.02% |
| SELECT SECTOR SPDR TRNEW | XLP | 0.01% |
| Company | Ticker | Prev weight |
|---|---|---|
| JAMF HLDG CORP | SYN_47074L105 | 0.03% |
| STATE STR SPDR S&P MIDCAP 40 | MDY | 0.01% |
| ISHARES TR | SYN_46436E866 | 0.00% |
| VANGUARD SCOTTSDALE FDS | VONE | 0.00% |
| MONDELEZ INTL INC | MDLZ | 0.00% |
Portfolio composition
Sectors, concentrations, and a tap-through treemap of every position in the fund's latest 13F.
Quarterly shifts
Top movers versus the prior reporting quarter. Left panel bridges market-value change in USD millions; right panel shows share-count change in %.
Holding period analytics
Distribution of holding periods for all 476 stocks the fund has ever held (up to selected quarter):
Peer Group — Funds With Most Portfolio Overlap
Ranked by percentage of the peer fund's 13F equity portfolio that overlaps with Mairs & Power's positions in Q4 2025.
| # | Fund | Shared Positions | Overlap % |
|---|---|---|---|
| 1 | Trustees of Columbia University in the City of New York | 1 | 99.6% |
| 2 | H&H International Investment | 7 | 86.9% |
| 3 | Berkshire Hathaway | 12 | 82.4% |
| 4 | Gates Foundation Trust | 11 | 78.4% |
| 5 | Himalaya Capital Management | 5 | 73.4% |
13F AUM Development
Quarterly 13F-reported equity AUM for Mairs & Power, derived from aggregate long equity position market values disclosed to the U.S. SEC.
Methodology & FAQ
How We Track Mairs & Power Holdings
Our data is systematically aggregated directly from quarterly Form 13F-HR disclosures submitted to the U.S. Securities and Exchange Commission (SEC).
- Who Must File (Reporting Threshold): This dataset includes filings from U.S. institutional investment managers, hedge funds, mutual funds, university endowments, and family offices managing at least $100 million in qualifying discretionary U.S. equities.
- What is Included (Data Scope): We exclusively capture long equity positions and listed options (calls and puts) for Mairs & Power. By SEC regulation, 13F filings do not require the disclosure of short positions, non-U.S. holdings, or OTC derivatives.
- Portfolio Weight Explained (Metric Definition): “Portfolio Weight” shows how much of a fund's total 13F U.S. equity portfolio is allocated to a specific position on the reporting date.
- How to Use This Data (Interpretation): Quarter-over-quarter changes in shares and portfolio weight reflect a combination of active trading and market price movements. These are descriptive metrics of fund allocation, not explicit buy or sell signals.
How do you measure hedge fund conviction in Mairs & Power's portfolio?
We evaluate conviction by looking at portfolio weight rather than just absolute share count. A position that represents a large percentage of a fund's total 13F equity value signals high conviction, regardless of whether it ranks highly in absolute dollar terms. Tracking how this weight changes quarter-over-quarter helps distinguish active capital allocation from passive drift.
Does Mairs & Power's 13F data include short positions or derivatives?
SEC Form 13F only mandates the disclosure of long U.S. equity positions and listed options (put and call contracts). Short interest, swaps, and OTC derivatives are excluded by regulatory design. To ensure accurate position scaling, listed options are reported based on their underlying share equivalent.
Are family offices and endowments included in this data?
Yes. Any institutional entity exercising investment discretion over at least $100 million in qualifying U.S. equities must file a Form 13F — this explicitly includes single-family offices and university endowments. If a qualifying entity holds positions reported by Mairs & Power, their allocation is included in this dataset.
When is the data updated, and is there a reporting lag?
Institutional investment managers are required to file their Form 13F within 45 days after the end of each calendar quarter (the standard “T+45” window). Our platform processes filings immediately upon publication to the SEC EDGAR database, providing point-in-time consensus positioning without look-ahead bias.
Data Source: Aggregated from public SEC Form 13F filings via the EDGAR database.