First Majestic Silver Corp. (NYSE: AG) (TSX: AG) (FSE: FMV) is pleased to announce positive infill drilling results from the Santo Niño and Navidad targets at its Santa Elena Silver/Gold Mine in Sonora, Mexico. The Company has also received the permits required to construct the Santo Niño and Navidad portals and plans to invest an additional $12 million in 2026 to advance underground access, portal construction, and development work intended to position Santo Niño for near-term mining.

“The continued advancement of Santo Niño and Navidad marks an important step in unlocking the next phase of growth at Santa Elena,” stated Keith Neumeyer, CEO of First Majestic. “Infill drilling continues to return significant silver and gold intercepts at both targets. With construction permits now received for the Santo Niño and Navidad portals, and an additional $12 million investment planned in 2026, we are moving Santo Niño from discovery toward near-term mining readiness while continuing to advance Navidad, one of the most significant discoveries made at Santa Elena to date. Together, Santo Niño and Navidad are expected to become important contributors to the future mine plan and have the potential to materially extend Santa Elena’s mine life.”

2026 EXPLORATION HIGHLIGHTS

Santo Niño Vein System

To date, a total of 26,904 metres of drilling has been completed across 69 holes in 2026 at Santo Niño as part of the Company’s ongoing resource-conversion and development-focused drilling program. Drilling at Santo Niño has focused primarily on infilling the current Inferred Mineral Resources to support potential conversion to Indicated Mineral Resources and to advance near-term mine planning. Results received to date include significant silver and gold intercepts that are overall better than modeled and confirm the presence of higher-grade mineralization in the western portion of the vein.

Navidad Vein System

To date, a total of 7,704 m of drilling has been completed across 10 holes at Navidad in 2026. Drilling has focused primarily on supporting potential conversion of Inferred Mineral Resources to Indicated Mineral Resources at the Winter vein which, based on its geometric configuration, is expected to play an important role early in the future mine schedule. Results received to date include high-grade silver and gold intercepts near the edge of the current Inferred Mineral Resource.

Figure 1: Santa Elena District Map Highlighting Santo Niño and Navidad Target Areas. Plan View.

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KEY DRILLING HIGHLIGHTS

Table 1 presents a selection of significant silver and gold drill hole intercepts from the 2026 Santa Elena drilling program at Santo Niño and Navidad. The selected intercepts include results from resource-conversion drilling at the Santo Niño vein and the Winter vein at Navidad.

Table 1: Selection of Significant Drill Hole Intercepts from the Santa Elena 2026 Drill Program

Drilling remains ongoing at the Santo Niño and Navidad targets. At Santo Niño, drilling is being completed as part of a planned program of approximately 45,000 m in 2026. At Navidad, drilling is being completed as part of a planned program of approximately 17,000 m in 2026. The drilling is intended to increase data density, improve understanding of the mineralized volume, grade continuity, and vein geometry, and support potential conversion of Inferred Mineral Resources to Indicated Mineral Resources. This work is expected to strengthen geological confidence and support the basis for underground access design, mine planning, production scheduling, and economic evaluation.

Significant silver and gold mineralization intersected within the Santo Niño vein currently extends approximately 1,100 m along strike and 425 m down dip and the mineralization averages approximately 4.0 m in thickness ranging from 1.0 m to 16.0 m (Figure 2). Mineralized secondary veins and breccias in the hanging wall and/or footwall of the principal vein have also been identified in several drill holes and remain under investigation.

Figure 2: Santo Niño Vein Long Section Looking North with Significant Intercepts

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Significant silver and gold mineralization intersected within the Winter vein currently extends approximately 1,000 m along strike and 350 m down dip, with true thickness ranging from 2.8 m to 4.4 m (Figure 3). The 2026 drilling continues to support evaluation of the Winter vein as a potentially important early mining area within the Navidad mineralized system.

Figure 3: Winter Vein Long Section Looking Northwest with Significant Intercepts

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ADVANCING UNDERGROUND ACCESS TO SANTO NIÑO AND NAVIDAD

The Company is advancing Santo Niño and Navidad from resource definition toward underground development, supported by recently received portal construction permits and an additional $12 million investment planned for 2026. This next phase of work is expected to establish dedicated underground access to both areas, support decline and ramp development, and position higher-grade mineralization from Santo Niño and Navidad to contribute to the future Santa Elena district production profile.

A recently completed scoping-level study identified dedicated underground access as the preferred approach to advance the Santo Niño and Navidad mineral resources. At Santo Niño, the preferred access concept includes a dedicated portal, the Santo Niño portal, and an approximately 450 m haul road connecting the portal area to the existing Ermitaño haul road.

The study also indicates that development of an additional portal, the Navidad portal, located approximately 300 m from the Santa Elena processing facilities, together with ramp development from the lower levels of Ermitaño to provide secondary egress and ventilation, is expected to provide an efficient route to Navidad mineralization and support future haulage of mineralized material from the Navidad area (Figure 4).

Preliminary mining and processing schedules for the Santa Elena district resources indicate that higher-grade mineralization from Santo Niño and Navidad has a positive impact on production profiles, displacing lower-grade mineralization from other deposits.

The additional 2026 funding is planned to support construction of the Santo Niño and Navidad portals, advance hydrogeological studies, construct the haul road linking the Santo Niño portal to the Ermitaño haul road, complete approximately 800 m of decline development at Santo Niño, and complete an additional 1,300 m of development in the Ermitaño-to-Navidad ramp and from the Navidad portal.

Figure 4: Proposed Santo Niño and Navidad Portals and Access Development. Plan View (Top) and Orthogonal View Looking North-Northwest (Bottom)

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Permitting

The Company has received the permits required for construction of the Santo Niño and Navidad portals, representing a key regulatory milestone in advancing toward underground development activities for the two mineral resources. With these permits now in hand, the Company plans to commence portal construction and related infrastructure work in the second half of 2026.

Summary of Significant Assay Results

A summary of significant assay results from exploration drilling completed at Santo Niño and Navidad during the first half of 2026 are provided in Table 2 and Table 3 below.

Table 2: Summary of Significant Silver and Gold Drill Hole Intercepts at Santo Niño

Table 3: Summary of Significant Silver and Gold Drill Hole Intercepts at Navidad

Notes:

1. All holes are Diamond Drill Core; AgEq grade = Ag grade (g/t) + [Au (g/t) * 75].
2. From and To length indicated in metres, true width of the intercept is calculated per drill hole and vein angles.
3. See Appendix for details regarding drill hole locations, sample type, azimuth, dip and total depth.
4. Significant silver and gold drill hole intercepts were composited using the length weighted averages of uncapped sample assays, a 90 g/t AgEq minimum grade for Santo Niño, and 110 g/t AgEq minimum grade for Navidad; minimum composite length of 1.0 m (true width). A maximum of 1.0 m below the minimum grade cut-off was allowed as internal dilution. Where necessary to achieve minimum length, a single sample below the COG but grading >70g/t AgEq was allowed to be composited for short intervals.
5. Where present, single samples or intercepts with assay results higher than 1000 g/t Ag and/or 10 g/t Au are highlighted as “Include” in each intercept.

DATA VERIFICATION

First Majestic’s drilling programs follow established Quality Assurance, Quality Control  insertion protocols with standards, blanks, and duplicates introduced into the sample-stream. After geological logging, all drill core samples are cut in half. One half of the core is submitted to the laboratory for analysis, and the remaining half core is retained on-site for verification and reference purposes or for future metallurgical testing.

Core samples were submitted to the SGS laboratory (ISO/IEC 17025:2017) and to the First Majestic Central laboratory (Central laboratory) (ISO 9001:2015). At SGS, gold is analyzed by 50 g fire assay atomic absorption finish (GE-FAA50V5). Results above 10 g/t gold are analyzed by 50 g fire assay gravimetric finish (GO-FAG50V). Silver is analyzed by 3-acid digest atomic absorption finish (GE-AAS33E50). Results above 100 g/t silver are analyzed by 50 g fire assay gravimetric finish (GO-FAG57V). At Central laboratory, gold is analyzed by 30g fire assay atomic absorption finish (AU-AA13). Results above 10 g/t are analyzed by 30 g fire assay gravimetric finish (ASAG-14). Silver is analyzed by 3-acid digestion atomic absorption finish (AAG-13). Results above 100 g/t are analyzed by 30 g fire assay gravimetric finish (ASAG-14, ASAG-13).

For further information concerning QA/QC and data verification matters, key assumptions, parameters, and methods used by the Company to estimate Mineral Reserves and Mineral Resources, and for a detailed description of known legal, political, environmental, and other risks that could materially affect the Company’s business and the potential development of Mineral Reserves and Mineral Resources, see the Company’s most recently filed Annual Information Form available under the Company’s SEDAR+ profile at www.sedarplus.ca and the Company’s Annual Report on Form 40-F for the year ended December 31, 2025 filed with the United States Securities and Exchange Commission on EDGAR at www.sec.gov/edgar.

QUALIFIED PERSONS

Gonzalo Mercado, P. Geo., the Company’s Vice-President, Exploration & Technical Services and a “Qualified Person” as defined under National Instrument 43-101 Standards of Disclosure for Mineral Projects, has reviewed and approved the scientific and technical information contained in this news release. Mr. Mercado has verified the exploration data contained in this news release, including the sampling, analytical and test data underlying such information.

ABOUT FIRST MAJESTIC

First Majestic is a publicly traded mining company focused on silver and gold production in Mexico and the United States. The Company presently owns and operates four producing underground mines in Mexico: the Santa Elena Silver/Gold Mine, the Los Gatos Silver Mine (the Company holds a 70% interest in the Los Gatos Joint Venture that owns and operates the mine), the San Dimas Silver/Gold Mine, and the La Encantada Silver Mine, as well as a portfolio of development and exploration assets, including the Jerritt Canyon Gold Mine located in northeastern Nevada, U.S.A, which the Company is currently in the process of re-starting.

First Majestic is proud to own and operate its own minting facility, First Mint, LLC, and to offer a portion of its silver production for sale to the public. Bars, ingots, coins, and medallions are available for purchase online at www.firstmint.com, at some of the lowest premiums available.

FIRST MAJESTIC SILVER CORP.

“signed”

Keith Neumeyer, CEO

APPENDIX – DRILL HOLE DETAILS

Table A1: Drill Hole Collar Location, Sample Type, Azimuth, Dip and Total Depth from Santa Elena

Notes:

1. All drill hole collar coordinates are determined using total station equipment after hole completion with UTM WGS84, Zone 12 (metres) as the reference system.