
SVP, Products Business 06/25/2026 [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] Certain identified information has been excluded from this exhibit because it is both (i) not material and (ii) is the type of information that the registrant treats as private or confidential. Double asterisks denote omissions.

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MODIFICATION P00015 EXERCISE OF OPTION YEAR 7 (OY7) PURSUANT TO FAR 52.217-9 AND 1. PURPOSE The purpose of Modification P00015 is to: 1. Exercise Option Year 7 (OY7) pursuant to FAR 52.217-9, Option to Extend the Term of the Contract; 2. Incorporate the OY7 requirement for of ACAM2000 vaccine kits and associated replacement diluent quantities; and 3. 4. Option Year 7 and obligates $52,780,490 under CLIN 7001, the total contract amount obligated to date, including all prior years and the current exercised option year, will increase from 2. AUTHORITY Pursuant to FAR 52.217-9, Option to Extend the Term of the Contract, incorporated into Contract No. 75A50119C00071, the Government hereby exercises Option Year 7 (OY7) in accordance with the terms and conditions of the contract modification. Per page 3 of the modification, for Option Years Five (5) through Nine (9), the guaranteed shelf life at the time of delivery . The period of performance for OY7 shall be extended in accordance with the contract schedule and pricing established for Option Year 7. 3. OY7 REQUIREMENTS Under this modification, the Government exercises the OY7 requirement for: ACAM2000 vaccine kits of product, inclusive of ancillaries; and diluent vials for previously purchased vaccine inventory. All vaccine kits delivered under OY7 shall include diluent with a minimum of remaining shelf life at the time of delivery, in accordance with contract requirements. The contractor will perform potency testing using the FDA qualified and validated vaccinia-based potency assay on samples of Wetvax provided by the ASPR/SNS. 4. LIMITED ACCEPTANCE OF SHORT-DATED REPLACEMENT DILUENT Modification P00011 established a requirement that diluent shall possess a minimum of four remaining shelf life at the time of delivery. [ ** ] [ ** ] [ ** ] [ ** ] [ ** ][ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ]

Batch Number Delivery Quantity (Vials) Minimum Remaining Shelf Life at Delivery Unit Price 554673 June 2026 5. COMPLIANT DILUENT REQUIREMENTS Batch 570168 – June 2026 delivery (subject to compliance at time of delivery) Future production batches delivered in December 2026 or later *Vaccine Kit Diluent vaccine kits of ACAM 2000 delivered in June 2026 Description Batch Delivery Period QTY Vials Expiry Usg Time Out ACAM 2000 Diluent Us Label 570168 June 2026 Diluent Replacement Requirement- partially delivered in June 2026, with remaining balance in December 2026 Description Batch Delivery Period QTY Vials Price Per Vial Expiry Usg Time Out Years ACAM 2000 US Label 554673 June 2026 ACAM 2000 US Label 570168 June 2026 ACAM 2000 US Label TBD Dec 2026 Total: [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ][ ** ][ ** ][ ** ] [ ** ] [ ** ] [ ** ]

6. CONSIDERATION 7. LIMITATION OF EXCEPTION / NONPRECEDENTIAL EFFECT 8. REMAINING TERMS AND CONDITIONS Except as expressly modified herein, all other terms and conditions of the contract remain unchanged and in full force and effect. [ ** ] [ ** ] [ ** ] [ ** ] [ ** ] [ ** ]