Exhibit 99.3

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION OF ROCKET LAB CORPORATION AND IRIDIUM COMMUNICATIONS INC.

(in thousands, except share and per share values)

On June 28, 2026, Rocket Lab Corporation, a Delaware corporation (“Rocket Lab” or the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Iridium Communications Inc., a Delaware corporation (“Iridium”), Ion Merger Sub I, Inc., a Delaware corporation and an indirect wholly owned subsidiary of Rocket Lab (“Merger Sub I”) and Ion Merger Sub II, LLC, a Delaware limited liability company and an indirect wholly owned subsidiary of Rocket Lab (“Merger Sub II”). Pursuant to the Merger Agreement, and subject to the satisfaction or waiver of the conditions set forth therein, Merger Sub I will merge with and into Iridium (the “First Merger”) with Iridium continuing as the surviving corporation and an indirect wholly owned subsidiary of Rocket Lab, and immediately following the First Merger, the surviving corporation in the First Merger will merge with and into Merger Sub II, with Merger Sub II continuing as the surviving entity (the “Second Merger” and together with the First Merger, the “Mergers”). The Mergers are generally intended to qualify as a tax-free reorganization for U.S. federal income tax purposes so long as the value of the Stock Consideration relative to the Cash Consideration (each as defined below) received by the holders of Iridium Common Stock (defined below) meets the conditions for tax-free treatment. Should those conditions not be met, the Second Merger will not occur and the Mergers will not qualify as a tax-free reorganization for U.S. federal income tax purposes. “Combined Company” refers to Rocket Lab and its subsidiaries, including Iridium and its subsidiaries, taken as a whole, immediately after giving effect to the Mergers.

As a result of the Mergers, at the effective time of the First Merger (the “First Effective Time” or “Purchase”) each issued and outstanding share of common stock of Iridium, par value $0.001 per share (“Iridium Common Stock”), other than as specified in the Merger Agreement, will be converted into the right to receive (i) $27.00 in cash (the “Cash Consideration”) and (ii) a number of shares (the “Stock Consideration” and, together with the Cash Consideration, the “Merger Consideration”) of Rocket Lab’s common stock, par value $0.0001 per share (“Rocket Lab Common Stock”), equal to the “Exchange Ratio” as follows, in each case without interest: (i) if the Rocket Lab Stock Price (as defined below) is equal to or less than $67.50, then the Exchange Ratio will be 0.4000; (ii) if the Rocket Lab Stock Price is greater than $67.50 but less than $112.50, then the Exchange Ratio will be the quotient obtained by dividing $27.00 by the Rocket Lab Stock Price, rounded to four decimal places; and (iii) if the Rocket Lab Stock Price is equal to or greater than $112.50, then the Exchange Ratio will be 0.2400. “Rocket Lab Stock Price” is defined as the volume weighted average price per share of Rocket Lab Common Stock on the Nasdaq Global Select Market for the period of the ten consecutive trading days ending on and including the second full trading day prior to the First Effective Time.

The Merger Agreement provides that at the First Effective Time (i) each outstanding restricted stock unit covering Iridium Common Stock (the “Iridium RSU Awards”), including any Iridium RSU Award that includes performance-based vesting conditions (the “Iridium PSU Awards”), will be assumed by Rocket Lab and converted into a restricted stock unit award with respect to shares of Rocket Lab Common Stock (each, an “Assumed Iridium RSU Award”) subject to the same terms and conditions as applied to such Iridium RSU Award or Iridium PSU Award immediately prior to the closing of the Mergers “(Closing)” (including the same vesting and leaver provisions), except that such Assumed Iridium RSU Award will cover a whole number of shares of Rocket Lab Common Stock equal to the number of shares of Iridium Common Stock covered by such Iridium RSU Award or Iridium PSU Award immediately prior to the First Effective Time (and, with respect to Iridium PSU Awards, determined as if all applicable performance-based vesting conditions had been satisfied at target) multiplied by an Equity Award Exchange Ratio (as defined in the Merger Agreement) equal to (a) the Cash Consideration divided by the Rocket Lab Stock Price plus (b) the Exchange Ratio (rounded down to the nearest whole share), and each Assumed Iridium RSU Award will vest in full in the event of a termination of employment without cause within 12 months following the First Effective Time (in addition to any other provisions that apply to the corresponding Iridium RSU Award or Iridium PSU Award, including under the Iridium Executive Severance Plan), and (ii) each outstanding option to purchase Iridium Common Stock (the “Iridium Option Awards”) and each outstanding cash-settled stock appreciation right award with respect to Iridium Common Stock (the “Iridium CSAR Awards”) will be fully vested and exercisable and canceled and converted into the right to receive the Merger Consideration in respect of each share of Iridium Common Stock covered by such Iridium Option Award or Iridium CSAR Award (paid only in cash, in respect of an Iridium CSAR Award), calculated net of the exercise price or strike price, as applicable, of such Iridium Option Award or Iridium CSAR Award, less applicable withholdings. In connection with the Merger Agreement, Iridium’s Board of Directors approved cash retention awards (the “Iridium Retention Awards”) for certain employees. The Iridium Retention Awards are payable in two tranches, subject to the recipient’s continued employment, with 60% vesting upon the closing of the Mergers and the remaining 40% vesting on the six-month anniversary of the closing date.

In connection with the Merger Agreement, Rocket Lab entered into a commitment letter with Deutsche Bank AG New York Branch, Deutsche Bank Securities Inc., Wells Fargo Bank, National Association and Wells Fargo Securities, LLC and, pursuant to which Deutsche Bank AG New York Branch and Wells Fargo Bank, National Association have committed to provide, subject to the terms and conditions thereof, a 364-day senior secured bridge term loan facility in an aggregate principal amount of $3,600,000 (the “Bridge Facility”). Prior to the Closing, Rocket Lab intends to replace the Bridge Facility commitments with permanent financing on more favorable terms, however, such alternatives are not currently determinable. As a result, the unaudited pro forma condensed combined statements of operations for the six months ended June 30, 2026 and for the year ended December 31, 2025 assumes the Bridge Facility, which has a maturity of less than one year, was funded at the Closing and is outstanding for the entirety of the pro forma periods. In connection with the Mergers, the Company is evaluating amendments to certain existing debt agreements of Iridium which, if completed, could reduce borrowings under the Bridge Facility and the related interest expense. As the proposed amendments are not yet determinable, no adjustments related to such amendments have been reflected in these unaudited pro forma condensed combined financial statements.

The unaudited pro forma condensed combined balance sheet gives effect to the Purchase as if consummated as of June 30, 2026, and is derived from:

The unaudited pro forma condensed combined statement of operations for the six months ended June 30, 2026, gives effect to the Purchase as if it had occurred on January 1, 2025, and is derived from:

The unaudited pro forma condensed combined statement of operations for the year ended December 31, 2025, gives effect to the Purchase as if it had occurred on January 1, 2025, and is derived from:

This information should be read together with Rocket Lab’s (i) audited consolidated financial statements and related notes in Rocket Lab’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the Securities and Exchange Commission (“SEC”) on February 26, 2026 and (ii) unaudited condensed consolidated financial statements and related notes in Rocket Lab’s Quarterly Report on Form 10-Q for the six months ended June 30, 2026 filed with the SEC on August 10, 2026 and Iridium’s (i) audited consolidated financial statements for the year ended December 31, 2025 and related notes included in Exhibit 99.1 to this Current Report on Form 8-K and (ii) unaudited condensed consolidated financial statements for the six months ended June 30, 2026 and related notes included in Exhibit 99.2 to this Current Report on Form 8-K.

The unaudited pro forma condensed combined financial information has been prepared by the Company using the acquisition method of accounting for the Purchase, where the Company is the “accounting acquirer” and Iridium is the “accounting acquiree”. The pro forma adjustments are based upon the information currently available and certain assumptions and estimates that the Company believes are reasonable as of the date hereof as described in the accompanying notes. The following unaudited pro forma condensed combined balance sheet as of June 30, 2026, and the unaudited pro forma condensed combined statements of operations for the six months ended June 30, 2026, and for the year ended December 31, 2025, are based on the historical financial statements of Rocket Lab and Iridium. Unless otherwise indicated, all amounts presented in the unaudited pro forma condensed combined financial information and accompanying notes are expressed in thousands of U.S. dollars, except share and per share amounts. These unaudited pro forma condensed combined financial statements and information are provided for illustrative and informational purposes only. They do not purport to represent or be indicative of the consolidated results of operations or financial condition of the Company had the Purchase been completed as of the assumed date or for the periods presented, or which may be realized in the future, and should not be construed as representative of the future consolidated results of operations or financial condition of the combined entity. Actual results may differ materially from the assumptions within the accompanying unaudited pro forma condensed combined financial information.

For purposes of the unaudited pro forma condensed combined financial information, “Historical” refers to Rocket Lab’s and Iridium’s respective audited consolidated financial statement amounts or unaudited consolidated condensed financial statement amounts prior to giving effect to the Mergers. “Historical, as Reclassified” refers to

Iridium’s historical audited consolidated financial statement amounts or unaudited consolidated condensed financial statement amounts after giving effect to the reclassification adjustments described in Note 3, which were made to conform Iridium’s financial statement presentation to Rocket Lab’s presentation.

An updated determination of the fair value of Iridium’s assets acquired and liabilities assumed will be performed within one year after the Closing. The final purchase price allocation may be materially different from the preliminary purchase consideration allocation presented in the unaudited pro forma condensed combined financial information. Any changes in the fair values of the net assets or total purchase consideration as compared with the information shown in the unaudited pro forma condensed combined financial information may change the amount of the total purchase price allocated to goodwill, and other assets and liabilities, which may impact the combined entity’s balance sheet and statement of operations. As a result of the foregoing, the pro forma adjustments are preliminary and differences between these preliminary estimates and the final acquisition accounting may arise that could have a material impact on the accompanying unaudited pro forma condensed combined financial information and the combined entity’s future results of operations and financial position.

The unaudited pro forma condensed combined financial information does not reflect any expected cost savings, operating synergies, or revenue enhancements that the combined entity may achieve as a result of the Purchase or the costs necessary to achieve any such cost savings, operating synergies, or revenue enhancements.

UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

AS OF JUNE 30, 2026

(in thousands, except share and per share values)

The accompanying notes are an integral part of these pro forma condensed consolidated financial statements.

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

FOR THE SIX MONTHS ENDED JUNE 30, 2026

(in thousands, except per share data)

The accompanying notes are an integral part of these pro forma condensed consolidated financial statements.

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2025

(in thousands, except per share data)

The accompanying notes are an integral part of these pro forma condensed consolidated financial statements.

NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

(in thousands, except share and per share values)

Note 1 - Basis of Pro Forma Presentation

The unaudited pro forma condensed combined financial information has been prepared by the Company in connection with its acquisition of Iridium and the related financing, a leading provider of global voice, data and positioning, navigation and timing satellite services and the only commercial provider of communications services offering true global coverage, connecting people, organizations, and assets to and from anywhere in real time. Iridium sells products and services to government and commercial end users by recruiting and expanding a global wholesale distribution network.

The Company’s and Iridium’s historical financial statements were prepared in accordance with U.S. generally accepted accounting principles in the United States (“GAAP”). Management has included certain reclassification adjustments for consistency in presentation as discussed in Note 3. The Company is currently in the process of evaluating Iridium’s accounting policies which may identify differences between the accounting policies of the Company and Iridium. Based on the information currently available, the Company has determined on a preliminary basis that, except for those identified and adjusted for in the pro forma financials herein, no significant adjustments are necessary to conform Iridium’s accounting policies to the Company’s accounting policies.

The accompanying unaudited pro forma condensed combined financial information and related notes were prepared using the acquisition method of accounting in accordance with Accounting Standards Codification 805, Business Combinations, (“ASC 805”) in which Rocket Lab is the accounting acquirer and Iridium is the accounting acquiree. ASC 805 requires, among other things, that the assets acquired, and liabilities assumed, in a business combination, be recognized at their fair values as of the acquisition date unless subject to certain measurement exceptions. For purposes of the unaudited pro forma condensed combined balance sheet, the purchase price has been allocated to the assets acquired and liabilities assumed of Iridium based upon management’s preliminary estimate of their fair values. The excess of the purchase price consideration over the fair value of assets acquired and liabilities assumed represents goodwill. Accordingly, the purchase price allocation and related adjustments reflected in the unaudited pro forma condensed combined financial information are preliminary and subject to adjustment based on a final determination of fair value and tax contingency matters. The purchase price consideration as well as the estimated fair values of the assets and liabilities will be updated and finalized as soon as practicable, but no later than one year from the Closing.

The pro forma adjustments are based upon available information and certain assumptions that the Company believes are reasonable. The unaudited pro forma condensed combined financial information is provided for informational purposes only and does not purport to represent or be indicative of the consolidated results of operations or financial condition of the Company had the Purchase been completed as of the dates presented and should not be construed as representative of the future consolidated results of operations or financial condition of the combined entity. Accordingly, the unaudited condensed pro forma adjustments, which are described in the accompanying notes, may be revised as additional information becomes available and is evaluated. Therefore, it is likely that the actual adjustments will differ from the pro forma adjustments, and it is possible the difference may be material. Rocket Lab believes that its assumptions and methodologies provide a reasonable basis for presenting all of the significant effects of the Purchase and related transactions based on information available to management at the time and that the pro forma adjustments give appropriate effect to those assumptions in the unaudited pro forma condensed combined financial information.

The unaudited pro forma condensed combined financial information should be read in conjunction with the historical Rocket Lab and Iridium audited consolidated financial statements as of and for the year ended December 31, 2025, and unaudited condensed consolidated financial statements as of and for the six months ended June 30, 2026 and notes thereto and does not give effect to any anticipated synergies, operating efficiencies, tax savings, or cost savings that may be associated with the Purchase. The unaudited pro forma condensed combined financial information is not necessarily indicative of what the actual results of operations and financial position would have been had the Purchase and related transactions taken place on the dates indicated, nor are they indicative of the future consolidated results of operations or financial position of the Combined Company.

The unaudited pro forma financial statements do not reflect the impact of acquisitions completed after June 30, 2026 by Iridium or Rocket Lab, including Iridium’s acquisition of Aireon LLC (“Aireon”) which was completed on July 2, 2026. As a result of the Aireon acquisition by Iridium, Iridium’s debt obligations have increased subsequent

to June 30, 2026, incorporating a $183,400 one-year, non-interest-bearing loan from the sellers and the consolidation of Aireon’s existing term loans, which had an outstanding balance of $154,700 at the closing date. The remaining balances of the additional Aireon indebtedness is expected to be repaid by Rocket Lab at closing.

Note 2 - Significant Accounting Policies

The accounting policies used in the preparation of these unaudited pro forma condensed combined financial statements are based on the footnotes in Rocket Lab’s audited consolidated financial statements as of and for the year ended December 31, 2025, and Rocket Lab’s unaudited condensed consolidated financial statements as of and for the six months ended June 30, 2026. During the preparation of the unaudited pro forma condensed combined financial statements, management performed a preliminary analysis of Iridium’s financial information to identify differences in accounting policies as compared to those of Rocket Lab and determined that with the information currently available, there were no significant accounting policy differences between the companies requiring adjustments to conform Iridium’s accounting policies to Rocket Lab accounting policies for purposes of unaudited pro forma condensed combined financial statements. This conclusion is subject to change as Rocket Lab continues to conduct a detailed review of Iridium’s accounting policies which may result in the identification of additional differences between the accounting policies of the two companies that, when conformed, could have a material impact on the unaudited pro forma condensed combined financial information.

Note 3 - Iridium Reclassification Adjustments

During the preparation of the unaudited pro forma condensed combined statement of operations, management performed a preliminary analysis of Iridium’s financial information to identify differences in Iridium’s financial statement presentation as compared to the financial statement presentation of the Company and has made certain reclassification adjustments to conform Iridium’s historical financial statement presentation to the Company’s financial statement presentation. The Company is currently performing a full and detailed review of Iridium’s financial statement presentation, which could result in the amounts in the Company’s future financial statements being materially different from the amounts set forth in the unaudited pro forma condensed combined financial information presented herein.

The following table reflects certain reclassification adjustments to conform Iridium’s historical consolidated balance sheet presentation as of June 30, 2026 to Rocket Lab’s historical consolidated balance sheet presentation as of June 30, 2026, which have no impact on net assets and are summarized below (in thousands):

The table below reflects certain adjustments made to present Iridium’s historical Consolidated Statement of Operations for the six months ended June 30, 2026 to conform with that of Rocket Lab’s historical consolidated statement of operations for the six months ended June 30, 2026 (in thousands):

The table below reflects certain adjustments made to present Iridium’s historical consolidated statement of operations for the year ended December 31, 2025 to conform with that of Rocket Lab’s historical consolidated statement of operations for the year ended December 31, 2025 (in thousands):

Note 4 - Preliminary Purchase Price Allocation

Estimated Merger Consideration

The estimated aggregate Merger Consideration has been determined based on the volume weighted average price of shares of Rocket Lab Common Stock for the period of 10 consecutive trading days ending on August 7, 2026, the latest practicable date prior to the date of this Current Report on Form 8-K, of $69.3305.

The pro forma financial information reflects estimated aggregate consideration of approximately $7,589,872 for the Mergers, as calculated below.

The preliminary purchase consideration consists of the Cash Consideration and the Stock Consideration. The actual fair value at the Closing will vary based on inputs such as the market price of Rocket Lab Common Stock and the number of shares of Iridium Common Stock outstanding. An estimate of the preliminary purchase consideration is as follows (in thousands, except number of shares and per share amounts):

In connection with the Mergers, outstanding Iridium RSU Awards and Iridium PSU Awards will be converted into Rocket Lab RSUs. A portion of the fair value of the converted RSUs and PSUs will be attributed to pre-combination service and included as a component of purchase consideration. The amount allocated to purchase consideration related to the converted RSUs is $80,682. In addition, Iridium Option Awards covering 153,694 shares of Iridium Common Stock will be converted into the right to receive the Merger Consideration in respect of those shares, calculated net of the applicable exercise price, and will be included as a component of purchase consideration at an estimated fair value of $7,674. The outstanding Iridium CSAR Awards covering 229,796 shares of Iridium Common Stock will be converted into the right to receive the Merger Consideration payable solely in cash, and are also included as a component of purchase consideration at an estimate fair value of $5,443.

Merger consideration sensitivity

The actual purchase price will fluctuate with the market price of shares of Rocket Lab Common Stock until the merger is consummated. As a result, the final purchase price could differ significantly from the current estimate, which could materially impact the unaudited pro forma financial statements. The Exchange Ratio mechanics cause changes in Rocket Lab Stock Price between $67.50 to $112.50 to result in immaterial differences to preliminary purchase consideration. For every $1 increase in the share price above the $112.50 threshold, preliminary purchase consideration is expected to increase by approximately $25,430. For every $1 decrease in the share price below the $67.50 threshold, preliminary purchase consideration is expected to decrease by approximately $42,383.

Any change in the value of equity awards allocated to purchase consideration due to a change in the Rocket Lab Stock Price is not expected to be significant.

Preliminary Purchase Price Allocation

For the preliminary estimate of fair values of assets acquired and liabilities assumed of Iridium, the Company used publicly available benchmarking information as well as a variety of other assumptions, including market participant assumptions. The Company has, and is expected to use, widely accepted income-based, market-based, and cost-based valuation approaches upon finalization of purchase accounting for the Purchase. Actual results may differ materially from the assumptions within this unaudited pro forma condensed combined financial information.

The unaudited pro forma adjustments are based upon available information and certain assumptions the Company believes are reasonable under the circumstances.

The following table summarizes the preliminary purchase price allocation as of the date of the Purchase (in thousands):

Note 5 – Purchase Adjustments

Adjustments to the Unaudited Pro Forma Condensed Combined Balance Sheet as of June 30, 2026

Adjustments to the Unaudited Pro Forma Consolidated Statement of Operations for the six months ended June 30, 2026 and year ended December 31, 2025

Increase in amortization expense reflected in the pro forma statement of operations during the six months ended June 30, 2026 and the year ended December 31, 2025, respectively consisted of the following (in thousands):

Stock based compensation expense recorded in the pro forma statement of operations during the six months ended June 30, 2026 and the year ended December 31, 2025, respectively consisted of the following:

Note 6 – Financing Adjustments

Adjustments to the Unaudited Pro Forma Condensed Combined Balance Sheet as of June 30, 2026

The deferred issuance costs are presented as a direct deduction from the related debt balance. As a result, the pro forma balance sheet reflects Bridge Facility, net of $3,574,340.

Adjustments to the Unaudited Pro Forma Consolidated Statement of Operations for the six months ended June 30, 2026 and year ended December 31, 2025

As of June 30, 2026, the effective interest rate of the Bridge Facility is approximately 8.0%. A change of 0.125% in the annual interest rate would change pro forma Interest expense by approximately $2,252 for the six months ended June 30, 2026 and $4,550 for the year ended December 31, 2025, assuming the full outstanding principal balance of the Bridge Facility remains outstanding.

Note 7 – Earnings (Loss) Per Share

For the six months ended June 30, 2026, and the year ended December 31, 2025, pro forma combined basic net income (loss) per share is calculated using the historical Rocket Lab weighted average shares outstanding during each period inclusive of the assumed issuance of 41,259,372 and 40,855,184 shares respectively of Rocket Lab Common Stock issued to Iridium stockholders. The shares issued as consideration are assumed to be outstanding at the beginning of the earliest period presented, and are therefore included in the weighted average shares outstanding for all periods presented. For the six months ended June 30, 2026, and the year ended December 31, 2025, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the combined pro forma net loss resulting in potentially dilutive shares being anti-dilutive.

The pro forma combined weighted average basic shares outstanding were calculated as follows (in thousands, except number of shares and per share amounts):

Stock Consideration for the Mergers—Stock Price Range Sensitivity Analysis

The Stock Consideration portion of the Merger Consideration will be subject to a range based on the Exchange Ratio, as discussed in Note 4 above. As the Stock Consideration paid as part of the Merger Consideration is subject to the Rocket Lab Stock Price, the number of shares to be issued as Stock Consideration could vary, impacting pro forma basic and diluted weighted average shares outstanding and pro forma basic and diluted net income (loss) per share. The assumed Stock Consideration of $2,860,533 above is based on an Exchange Ratio of 0.3894, as the ten day volume weighted average price per share of Rocket Lab Common Stock ending on August 7, 2026 was between the minimum and maximum range of the Exchange Ratio as set forth in the Merger Agreement.

The following sensitivity analysis illustrates the impact to pro forma basic and diluted shares outstanding and pro forma basic and diluted net income (loss) per share if the Stock Consideration paid in connection with the Mergers was converted at both the minimum and maximum ends of the Exchange Ratio (in thousands, except per share amounts):