Columbus Acquisition Files Merger Proxy for WISeSat Deal; Stock Falls 5%

What happened

Columbus Acquisition Corp (Nasdaq: COLA) filed a definitive proxy statement/prospectus with the SEC on August 19, 2026, according to the filing. The document sets a shareholder vote for September 10, 2026 on the company's proposed business combination with WISeSat.Space Corp.

Shares closed at $9.75 on the event date, down 5.06% from the prior close of $10.27, according to the price data provided. The filing does not state a reason for the price move.

Columbus Acquisition is a Cayman Islands blank-check company — commonly called a SPAC — with no operating business of its own. Its shares, units and rights trade on Nasdaq under COLA, COLAU and COLAR.

The deal being voted on

The transaction has three moving parts described in the filing. First, WISeSat.Space Holdings Corp., a new British Virgin Islands company referred to as Pubco, will acquire all ordinary and Class F shares of WISeSat.Space Corp. from seller WISeKey International Holding Ltd. Second, a Pubco subsidiary will merge into Columbus Acquisition, leaving Columbus as a wholly owned Pubco subsidiary. Third, Columbus' existing shares will be cancelled and exchanged one-for-one for Pubco ordinary shares.

The sellers are to receive Pubco shares worth $250 million plus the amount of any transaction financing contributed before closing, divided by $10.00. The filing says SEALSQ Corp (Nasdaq: LAES), a WISeKey subsidiary, has provided $10 million of that financing.

A separate $10 million subscription agreement dated August 6, 2026 has SEALSQ buying Pubco shares at the redemption price. The filing estimates that price at about $10.66 as of June 30, 2026, which would mean roughly 938,086 shares. If Pubco's volume-weighted average price over a set 10-day window after closing falls below the purchase price, Pubco must issue additional shares to the investor, with the VWAP floor set at $5.00.

After closing, Columbus shares are expected to stop trading on Nasdaq under COLA, and Pubco shares are expected to list under the symbol SAIQ. Nasdaq listing approval is a condition of the deal.

What shareholders are being asked to approve

The filing lists several proposals. Proposal No. 1 amends Columbus' articles to loosen the net tangible asset requirement — currently $5,000,001 — that applies when shareholders redeem their shares in connection with a business combination. The filing says the change expands the methods Columbus may use to avoid SEC "penny stock" rules.

Proposal No. 2 approves the business combination agreement, dated November 9, 2025 and amended August 6, 2026. Proposal No. 3 approves the merger itself and related changes to Columbus' share capital as the surviving company.

The proxy statement/prospectus also registers up to 31,385,052 Pubco ordinary shares issued in connection with the deal.

What this means

A SPAC is a shell company that raises money in an initial public offering and holds it in trust, with a set deadline to find a private company to merge with. A DEFM14A is the definitive — meaning final, not draft — proxy statement filed under Section 14(a) of the Securities Exchange Act. A company files one when it needs shareholder votes on matters that require a meeting; here, that is the September 10 extraordinary general meeting. The word "definitive" distinguishes it from a preliminary proxy, which the SEC may comment on before it is finalized.

Because this is a business combination rather than a routine annual meeting, the same document serves two jobs: it is a proxy statement soliciting votes from Columbus shareholders, and it is a prospectus registering the Pubco shares those shareholders and the sellers will receive. That dual role is why the cover page carries two titles.

The redemption mechanic matters for the vote. SPAC shareholders who do not want to stay invested after a merger can instead ask for their money back from the trust — that payment is the "redemption price" referenced in the SEALSQ subscription. The net tangible asset test in Proposal No. 1 exists because a SPAC whose assets shrink too far after redemptions can fall under penny-stock rules. The filing says Columbus wants more flexibility in how it clears that threshold, without stating how many shares it expects to be redeemed.

The structure being described — a Cayman shell, a BVI holding company, a Swiss parent seller, and a Nasdaq listing under a new ticker — is common in SPAC deals because each jurisdiction handles share exchanges and tax treatment differently. What a holder of COLA shares ends up owning is one share of the new Pubco, not a share of Columbus.

The filing itself does not explain the day's 5.1% decline in the share price, and no source provided here connects the two. What the filing does establish is the sequence: shareholders vote on September 10, 2026, and if the proposals pass and Nasdaq approves the listing, COLA, COLAU and COLAR stop trading and Pubco shares begin trading under SAIQ.