Andrew R. Adams - Mairs & Power Growth Fund Investment Strategy (Jun 30, 2025)

As of Jun 30, 2025, the Mairs & Power Growth Fund portfolio managed by Andrew R. Adams demonstrates a sophisticated investment approach with 171 positions and an average holding period of 848 quarters. The strategy focuses on Basic Materials, Communication Services, Consumer Cyclical, Consumer Defensive, Energy, Financial Services, Healthcare, Industrials, Real Estate, Technology, Utilities sectors with a typical position size of 0.7% of the portfolio.

The portfolio's risk management approach includes a maximum position size of 0.72% and sector diversification of 11%, exemplified by the case study of Microsoft (MSFT). This strategic framework provides insights into Andrew R. Adams's investment philosophy, risk management practices, and long-term value creation approach.

Investment Strategy Metrics

Key metrics revealing investment style, risk management, and performance characteristics

Metric	Value	Category	Description
Holding Period	2.3 years	Style	Average duration positions are maintained
Position Count	171	Style	Number of active positions in portfolio
Position Size	0.7%	Risk	Typical allocation per position
Win Rate	47.1%	Performance	Percentage of profitable positions
Average Return	6.2%	Performance	Mean return across positions
Sharpe Ratio	0.05	Performance	Return per unit of risk taken

Investment Case Study: Microsoft (MSFT)

6/30/2013 - 11/10/2025

Performance Metrics

Total Return: 685.27%

Holding Period: 4516 days

Max Position Size: $268,978.00

Position Weight: 0.72%

Key Events

6/30/2013: ENTRY(243,922.00 shares) @ $0.03

9/30/2013: DECREASE(-58,024.00 shares) @ $0.03

12/31/2013: INCREASE(8,056.00 shares) @ $0.04

3/31/2014: DECREASE(-1,558.00 shares) @ $0.04

6/30/2014: DECREASE(-16,849.00 shares) @ $0.04

9/30/2014: DECREASE(-3,569.00 shares) @ $0.05

12/31/2014: DECREASE(-7,675.00 shares) @ $0.05

3/31/2015: INCREASE(1,714.00 shares) @ $0.04

6/30/2015: DECREASE(-5,160.00 shares) @ $0.04

9/30/2015: DECREASE(-572.00 shares) @ $0.04

12/31/2015: DECREASE(-628.00 shares) @ $0.06

3/31/2016: DECREASE(-2,473.00 shares) @ $0.06

6/30/2016: DECREASE(-1,380.00 shares) @ $0.05

9/30/2016: DECREASE(-3,332.00 shares) @ $0.06

12/31/2016: DECREASE(-4,154.00 shares) @ $0.06

3/31/2017: INCREASE(2,492.00 shares) @ $0.07

6/30/2017: INCREASE(521.00 shares) @ $0.07

9/30/2017: INCREASE(2,038.00 shares) @ $0.07

12/31/2017: DECREASE(-3,980.00 shares) @ $0.09

3/31/2018: INCREASE(665,795.00 shares) @ $0.09

6/30/2018: INCREASE(342,127.00 shares) @ $0.10

9/30/2018: INCREASE(143,160.00 shares) @ $0.11

12/31/2018: INCREASE(181,207.00 shares) @ $0.10

3/31/2019: INCREASE(161,671.00 shares) @ $0.12

6/30/2019: INCREASE(41,425.00 shares) @ $0.13

9/30/2019: INCREASE(14,081.00 shares) @ $0.14

12/31/2019: INCREASE(6,774.00 shares) @ $0.16

Investment Thesis

Entry Context: Initial position established based on fundamental analysis

Sector Conditions: Favorable market conditions in the sector

Risk Factors:

Market volatility
Sector-specific risks

Key Learnings

Position sizing is critical for portfolio management
Important to monitor sector exposure