Olin Corporation's stock climbed 6.7% in pre-market trading to $27 after the company and Huntsman Corporation unveiled an all-stock merger of equals that will form a single chemicals company to be called OlinHuntsman Corporation. The firms said the combined enterprise value of the new entity will be in excess of $12 billion.
The merger agreement was signed on June 15, 2026 and publicly announced on June 16. Under the terms of the deal, Olin shareholders are expected to own approximately 54.5% of the merged company. Huntsman shareholders will receive 0.5476 Olin shares for each Huntsman share they hold.
Company executives and the agreement materials point to clear financial drivers behind the transaction. The two firms identified more than $400 million in tangible cost synergies and integration benefits, and they expect the vast majority of those savings to be realized within 24 months after the deal closes. The governance plan names Olin CEO Ken Lane to lead the combined company as Chief Executive Officer, while Peter Huntsman will take on the role of non-executive Chairman.
The announcement arrived alongside broadly positive market moves. The S&P 500 rose 1.65% to 7,554.29 on Monday, marking its largest one-day percentage gain in weeks, a move the companies said was supported by easing geopolitical tensions following a U.S.-Iran peace agreement and a pronounced drop in oil prices. Lower oil prices are a notable input-cost tailwind for chemical producers.
Other major indexes were also higher on the same session, with the Nasdaq up 3.1% and the Dow gaining 0.9%, creating a risk-on market environment that amplified investor interest in transactions. Those market conditions, coupled with the merger's scale, projected cost savings, and management continuity, helped propel Olin's pre-market rally and pushed the stock nearer the top of its 52-week range of $18.08 to $30.46.
The combination of strategic fit, expected integration benefits, and a supportive macro and market backdrop are presented by the companies as the primary factors underpinning the share price reaction in pre-market trading.
Summary
Olin and Huntsman will merge in an all-stock transaction to create OlinHuntsman Corporation with combined enterprise value above $12 billion. The signed agreement allocates roughly 54.5% ownership to Olin shareholders and provides Huntsman shareholders with 0.5476 Olin shares per Huntsman share. Management plans call for Ken Lane as CEO and Peter Huntsman as non-executive Chairman. The companies expect over $400 million in synergies, mostly within 24 months. The announcement coincided with a broadly positive market session that helped lift Olin shares in pre-market trading.