FAIR LAWN, N.J., July 8, 2026 Columbia Financial has become the most interesting bank deal on the calendar because this is not a routine IPO and not a routine thrift conversion. On July 7 the company launched a firm commitment underwritten offering for the shares left over after its subscription process, with $1.1 billion already spoken for in the subscription and resolicitation rounds and another roughly $281 million to $769 million still headed to the street at $10 a share. That leftover block is what turns Columbia from a mutual-conversion story into a real market test.
The formal max deal size is 192.625 million shares, or $1.926 billion, with a 142.375 million share minimum to close. But reading that number like a plain vanilla IPO misses the setup. Columbia already trades as CLBK, but it does so as the minority public float of a mutual holding company. Outside holders own about 26.9 percent of the current company and will be exchanged into the new Maryland successor so their percentage ownership is preserved, while the mutual holding company’s 73.1 percent stake is canceled. IPOGrid reads the $10 sticker as thrift-conversion math, not as a sudden markdown of the listed bank’s value.
The real purpose of the capital raise is bigger. Columbia agreed in February to buy Northfield Bancorp in a transaction valued at about $597 million, and the conversion, stock sale and acquisition are meant to close together. Northfield holders can elect stock or cash, with consideration set at 1.425 shares or $14.25 per share if the final appraisal lands below $2.3 billion, 1.450 shares or $14.50 if it lands between $2.3 billion and $2.6 billion, and 1.465 shares or $14.65 if it clears $2.6 billion. The cash election is capped at 30 percent of Northfield’s outstanding shares. That is why Columbia’s book matters even after the depositor-driven phase. The merger exchange ratio, the mix of stock and cash, and the size of the final underwritten block all still run through the appraisal and the final sale outcome.
The demand pattern is worth reading carefully. Columbia did not clear the whole deal inside the initial subscription window; it had to raise the maximum individual order to 800,000 shares from 300,000 and the group limit to 5 million shares from 1 million, then resolicit the max buyers through June 30. That is not a broken book, but it is not effortless demand either. Our interpretation is that the franchise could attract substantial committed money once limits widened, yet it still needed Wall Street distribution to finish a deal of this size. For IPO readers, that distinction matters more than the headline gross proceeds figure.
The bank group is appropriately specialized. Keefe, Bruyette & Woods, now under Stifel, is lead-left, with Piper Sandler and Brean Capital alongside. In its May 8 approval order, the Federal Reserve said the combined company would have roughly $18.1 billion in consolidated assets and become the 110th largest insured depository organization in the United States. The same order said the combined institution would remain well capitalized. Management also pitched the merger as creating the third largest regional bank headquartered in New Jersey, with pro forma assets of $18 billion as of year-end 2025. Those are credible strategic selling points, and they help explain why Columbia is willing to absorb the complexity of a conversion and a merger at the same time.
The underlying bank is not being floated on hope alone. Columbia reported first quarter net income of $13.1 million, net interest income of $60.4 million and a 2.42 percent net interest margin, while March 31 assets were about $11 billion. Merger-related expense added $1.8 million in the quarter, which at least shows the transaction is already flowing through the income statement. Northfield brings 37 branches across Staten Island, Brooklyn and New Jersey. IPOGrid would frame the industrial logic this way: Columbia is using the thrift-conversion playbook to fund a geographic step-up, but it is asking public investors to underwrite both the capital formation and the integration story at once.
The caution flags are straightforward. Completion still depends on final regulatory approvals and the final independent appraisal, and the minimum sale threshold can be reached with shares issued as merger consideration to Northfield holders, which means the headline demand bar is not the same as pure third-party cash demand. The July 7 final prospectus, free writing prospectus and effectiveness notice put the formal launch documents on EDGAR, but they do not remove execution risk. What they do is make Columbia a live read on whether regional bank consolidation and mutual-conversion mechanics can still produce a credible public book once the unsubscribed balance gets too large to hide inside community-order optics.