Heartland Advisors, an investment management company, released its “Heartland Mid Cap Value Fund” fourth-quarter 2025 investor letter. A copy of the letter can be downloaded here. As the overall stock market continues to widen, mid-caps are not experiencing the same. The high-quality value stocks continue to underperform, while speculative, low-quality, and momentum-driven sections of the market have received significant attention, and the valuation gaps are widening further. Against this backdrop, the Fund ...