UniFirst Stock Plummets as FTC Moves to Block $5.5 Billion Cintas Merger

UniFirst Corporation (NYSE: UNF) shares plunged nearly 10% in morning trading after the U.S. Federal Trade Commission announced its intention to file a lawsuit to block the company's proposed $5.5 billion acquisition by rival Cintas. The sell-off reflects significantly increased investor doubt that the deal will be completed, compounded by a recent deterioration in UniFirst's standalone financial results.

FTC Challenges Merger on Antitrust Grounds

The FTC is challenging the merger on the basis that it would substantially reduce competition in the uniform rental and facility services market. According to a report from Investing.com, the agency's decision to pursue litigation directly, rather than negotiate a structural remedy such as asset divestitures, suggests regulators believe no simple fix can address their antitrust concerns.

The move represents a significant escalation in the regulatory review process. Both companies had previously agreed not to close the transaction before December 11, 2026, to allow the agency time to complete its investigation.

Market Reaction and Arbitrage Spread

The market's reaction was swift, with UniFirst shares falling by as much as 9.9% to an intraday low of $232.36. The stock remains well below its 52-week high of $306.67, a level that was largely supported by the expected completion of the acquisition.

A key indicator of investor sentiment, the merger arbitrage spread, surged from approximately $50 to $77. This widening gap reflects a sharp reassessment by traders of the probability that the transaction will successfully close. The decline in UniFirst's stock occurred even as the broader S&P 500 and Nasdaq indices traded higher for the day.

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Weakening Fundamentals Add Pressure

Adding to the pressure on the stock is a notable weakening in UniFirst's underlying financial performance. Should the Cintas deal ultimately fail, investors would be left holding shares in a company with a less attractive financial profile.

For its 2026 fiscal year, UniFirst reported:

• A sharp decline in net income.
• An approximately 50% drop in free cash flow.

This combination of a collapsing merger premium and deteriorating fundamentals has created a particularly severe sell-off for the company's shares.