Iridium Communications Inc. (Nasdaq: IRDM) filed a Form 425 with the Securities and Exchange Commission on August 6, 2026. The document is an employee question-and-answer sheet posted to the company's internal intranet the same day and filed as merger communication under Rule 425 and Rule 14a-12, in connection with the proposed acquisition of Iridium by Rocket Lab Corporation. Employee FAQs are not deal documents, but they are filed because they contain disclosable terms, and this one does.

The filing states that Iridium has entered into a definitive agreement to be acquired by Rocket Lab, describing the counterparty as a global leader in launch and space systems, and that upon closing Iridium will become part of Rocket Lab. It gives an expected closing of mid-2027, subject to regulatory and shareholder approvals.

Under the terms of the agreement, Iridium shareholders will receive $27 in cash plus a number of shares of Rocket Lab common stock calculated pursuant to an exchange ratio.— Iridium Communications Inc., Form 425 filed August 6, 2026, source

What the exchange ratio does

The filing sets the ratio in three regimes, keyed to a Rocket Lab share price measured at a point the FAQ describes but does not reduce to a single figure. If that price is equal to or less than $67.50, the exchange ratio is 0.4000. If it is equal to or greater than $112.50, the ratio is 0.2400. If it falls between the two, the ratio is the quotient obtained by dividing $27.00 by that price.

The arithmetic of those three rules is worth spelling out, because it is not obvious from the numbers alone. At the lower bound, 0.4000 multiplied by $67.50 is $27.00. At the upper bound, 0.2400 multiplied by $112.50 is also $27.00. And between them the ratio is defined as $27.00 divided by the price, which yields $27.00 of stock at every point in the band by construction. Inside the collar, in other words, the stock leg is worth a fixed $27.00 and the share count moves; outside it, the share count is fixed and the value moves. Paired with the $27 cash leg, the consideration is $54 in disclosed value while Rocket Lab trades between $67.50 and $112.50, and floats above or below that only outside the band.

This is a description of the mechanism as filed, not a valuation. The FAQ does not state a total transaction value, an implied premium, an aggregate share count or a reference price, and none of those are computed here. It also notes that whether the transaction is treated as a tax-free reorganisation or a taxable sale for holders will depend on the value of Rocket Lab common stock at closing — a consequence of the mixed cash-and-stock structure, and one the filing explicitly leaves unresolved.

It is worth being clear about what kind of document this is, because the category affects how much weight the contents carry. Rule 425 requires that written communications relating to a business combination be filed, and Rule 14a-12 sweeps in material that may function as proxy solicitation before a formal proxy statement exists. An intranet FAQ written for employees therefore becomes a public filing not because the company chose to publish terms but because it said something about the deal to a group of people, some of whom are shareholders. That is why the exchange-ratio mechanics appear in a document otherwise concerned with bonus timing and reporting lines.

One structural point about the cash leg is worth noting alongside the collar. Because $27 of the consideration is cash and, inside the band, a further $27 of value arrives as stock, the disclosed package is split roughly half and half between certain and share-denominated value while Rocket Lab trades in the band. That split is what drives the tax observation the FAQ makes: a transaction with a substantial cash component may or may not qualify as a tax-free reorganisation depending on the stock value at closing, which is precisely the variable the collar stops controlling once the price leaves the band.

The stated rationale, and the interval

On why the transaction is happening, the filing offers the board's framing: that the industry has entered a period of change in which vertically integrated companies — those that can design, build, launch and operate satellite networks — are the most competitive, and that combining the two creates a company positioned to lead in that environment. It lists the combined capability set as critical communications, Internet of Things, direct-to-device, resilient positioning, navigation and timing, aviation and maritime safety, and mission-critical services. These are the acquirer's and target's characterisations of their own deal, recorded here as such.

Most of the document concerns the interval before closing, and its answers are consistent and unremarkable: roles, responsibilities and reporting structures remain the same; pay and benefits continue unchanged; no changes are expected or contemplated to Iridium locations; and the 2027 bonus plan is to be continued and paid out by Rocket Lab after year-end in the normal course, assuming a mid-2027 close. Employees who hold shares receive the same merger consideration as other shareholders.

One answer in the FAQ is more consequential than its placement suggests: employees who are also shareholders will receive the same merger consideration as other Iridium shareholders. That is a statement about equal treatment of the equity, and it is the kind of assurance that has to be filed precisely because it concerns consideration rather than employment.

An eleven-month gap between announcement and expected closing is long enough that the collar has time to matter, and the FAQ is candid that approvals are outstanding. What the filing does not contain is equally relevant: no purchase price in aggregate, no financing detail, no breakup or termination fee, no regulatory theory of the case, no synergy target and no integration plan. Those, if disclosed, will appear in the merger agreement and the proxy materials rather than in an intranet FAQ. This document establishes the per-share mechanics and the timetable, and does so on the record.