New York City-based Engine Capital Management disclosed a buy of 14.2 million shares of Avantor (AVTR 2.20%), increasing its stake by an estimated $172 million in the third quarter, per a November 14 SEC filing.

What Happened

According to a Securities and Exchange Commission (SEC) filing dated November 14, Engine Capital Management, LP increased its position in Avantor (AVTR 2.20%) by 14.2 million shares during the third quarter. The value of this stake grew by approximately $172 million, resulting in a post-trade holding valued at $246.1 million as of September 30.

What Else to Know

Avantor now represents 29.2% of Engine Capital Management’s 13F AUM.

Top holdings after the filing: 

• NYSE: AVTR: $246.1 million (29.2% of AUM)
• NYSE: NATL: $94.7 million (11.2% of AUM)
• NASDAQ: LNW: $80.9 million (9.6% of AUM)
• NASDAQ: ACHC: $64.0 million (7.6% of AUM)
• NASDAQ: OFIX: $62.3 million (7.4% of AUM)

As of Friday, shares were priced at $10.93, down 48% over the past year and vastly underperforming the S&P 500, which is up 13% in the same period.

Company Overview

Company Snapshot

• Avantor provides high-purity chemicals, laboratory supplies, single-use assemblies, chromatography resins, analytical kits, and specialized instrumentation for the life sciences and advanced technology sectors.
• The company generates revenue through the sale of consumables, equipment, and services, including laboratory and production support, procurement, and biopharmaceutical development solutions.
• Primary customers include biopharmaceutical manufacturers, healthcare providers, academic and government research institutions, and advanced technology companies worldwide.

Avantor, Inc. is a global supplier of mission-critical products and services supporting biopharma, healthcare, education, and advanced technology industries. The company leverages a broad portfolio and integrated supply chain to serve complex customer needs across multiple regions. Its scale, diverse offerings, and focus on high-growth end markets position Avantor as a key partner for organizations engaged in scientific research and production.

Foolish Take

Avantor’s deep drawdown has created a setup long-term investors know well: Structurally important businesses can fall out of favor long before fundamentals stabilize. That tension—between cyclical weakness and long-term relevance—is central to why this move matters. Engine Capital's increased concentration signals conviction that Avantor’s portfolio of mission-critical lab and production supplies remains indispensable even as the company works through operational missteps and a challenged demand backdrop.

The latest quarter underscored that reset. Net sales fell 5% to $1.6 billion, while a $785 million non-cash goodwill impairment drove a GAAP net loss of $712 million. Still, adjusted EBITDA of $268 million and free cash flow of $172 million show the business continues to generate meaningful cash, bucking the harsh headline print. Management also authorized a $500 million share repurchase, a notable signal of confidence in future cash generation and execution progress.

Within Engine Capital’s portfolio, Avantor now represents a dominant 29.2% weighting—far larger than its next-largest holding—suggesting the fund views the selloff as misaligned with long-term value. For patient investors, the setup resembles a classic recovery bet: durable end-market exposure, improving internal discipline, and a valuation reset driven more by sentiment than solvency.

Glossary

13F: A quarterly SEC filing required from institutional investment managers to disclose their equity holdings.
Assets Under Management (AUM): The total market value of investments managed on behalf of clients by a fund or firm.
Position: The amount of a particular security or asset owned by an investor or fund.
Holding: A specific investment owned within a portfolio or fund.
Reportable Assets: Investments that must be disclosed in regulatory filings, such as the 13F report.
Post-trade: The state of a portfolio or position after a transaction has been completed.
Buy (in fund context): The purchase of additional shares or securities to increase a fund's exposure to an investment.
Lagging: Underperforming compared to a benchmark or index over a given period.
Biopharmaceutical: Relating to drugs produced using biotechnology, often for medical or therapeutic use.
Consumables: Products that are used up and need regular replacement, such as laboratory supplies.
Single-use assemblies: Pre-assembled, disposable components used in manufacturing or laboratory processes to reduce contamination risk.
TTM: The 12-month period ending with the most recent quarterly report.