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Avantor Inc (AVTR) shares increased by 3.1% to $15.81, with GuruFocus estimating a fair value of $16.87, suggesting it is undervalued by 6.3%. The company holds a GF Score of 71/100, indicating an above-average rating, largely due to strong momentum and valuation despite struggles in profitability and growth. Guru and insider buying activity signals confidence in the stock's future, but its current unprofitability warrants cautious investor consideration.