WISeKey’s WISeSat.Space Participates in FOSSA Systems Latest Financing Round, Reinforcing its European Secure Satellite Infrastructure Roadmap

WISeKey’s WISeSat.Space Pa ticipates i FOSSA Systems Latest Fi a ci g Rou d, Rei fo ci g its Eu opea Secu e Satellite I f ast uctu e Roadmap

I vestme t builds o a fou -yea elatio ship with FOSSA a d suppo ts WISeSat’s ext phase of scalable, post-qua tum- eady space i f ast uctu e

Ge eva, Switze la d – Ju e 25, 2026 – WISeKey I te atio al Holdi g Ltd. (“WISeKey”) (SIX: WIHN; Nasdaq: WKEY), a global leade i cybe secu ity, digital ide tity a d IoT, today a ou ced that its WISeSat.Space Co p. subsidia y (“WISeSat”) has pa ticipated i the latest fi a ci g ou d of FOSSA Systems, S.L. (“FOSSA”), a Spai -based ae ospace a d defe ce compa y specialisi g i small-satellite developme t, lau ch a d ope atio s fo Low Ea th O bit commu icatio s a d adio-f eque cy applicatio s.

The i vestme t st e gthe s a st ategic elatio ship that bega i 2021, whe WISeKey fi st pa t e ed with FOSSA to suppo t the developme t of small-satellite platfo ms fo secu e IoT commu icatio s f om Low Ea th O bit. Si ce the , FOSSA has co t ibuted to WISeSat’s ea ly satellite- elated activities a d pilot missio s, helpi g establish tech ical lea i g, flight he itage a d ope atio al expe ie ce that suppo t WISeSat’s pla ed t a sitio towa d la ge a d mo e capable satellite i f ast uctu e.

A St ategic Mome t fo Eu opea Secu e Space I f ast uctu eThe i vestme t comes at a time whe Eu ope is placi g i c eased emphasis o esilie t, sove eig a d secu e space capabilities. Ac oss the public a d p ivate secto s, space i f ast uctu e is i c easi gly see as a st ategic laye fo commu icatio s esilie ce, data secu ity, defe ce eadi ess, c itical i f ast uctu e p otectio a d tech ological auto omy.

Agai st this backd op, WISeSat’s co ti ued i vestme t i its FOSSA elatio ship ei fo ces its objective to build a Eu opea – ooted secu e satellite i f ast uctu e platfo m. WISeSat’s oadmap is focused o p ovidi g satellite capacity, o bital i f ast uctu e a d elated g ou d-segme t capabilities fo secu e commu icatio s, IoT co ectivity a d futu e post-qua tum a d qua tum-secu e use cases.

Expa di g o Fou Yea s of Collabo atio WISeSat has built a ea ly satellite access base ac oss 25 lau ched LEO satellites th ough pa t e -ope ated missio s, with access to 8 satellites cu e tly i ope atio . These missio s have co t ibuted to WISeSat’s pilot testi g, tech ical validatio a d flight-he itage p og amme as the compa y p epa es its ext phase of satellite i f ast uctu e.

This latest i vestme t eaffi ms WISeSat’s co fide ce i FOSSA’s small-satellite capabilities a d st e gthe s the i dust ial elatio ship betwee the two compa ies. WISeSat expects this elatio ship to emai eleva t as it evaluates ext-ge e atio satellite platfo ms, futu e lau ch equi eme ts, payload i teg atio , g ou d-segme t a chitectu e a d missio ope atio s fo secu e space-based i f ast uctu e.

Ecosystem I teg atio with WISeKey a d SEALSQWISeSat ope ates withi WISeKey’s ecosystem, which combi es cybe secu ity, digital ide tity, semico ducto s, post-qua tum tech ology a d t usted i f ast uctu e. Withi that ecosystem, SEALSQ Co p. (“SEALSQ”) (Nasdaq: LAES), a subsidia y of WISeKey, focuses o semico ducto s, public key i f ast uctu e a d post-qua tum tech ology p oducts.

SEALSQ has also established its Qua tum Fu d, SEALQUANTUM.COM, to suppo t the developme t of sove eig qua tum a d post-qua tum tech ology capabilities. While WISeSat’s i vestme t i FOSSA is a WISeSat st ategic i vestme t a d does ot by itself make FOSSA a SEALSQ Qua tum Fu d po tfolio compa y, it is alig ed with the b oade WISeKey a d SEALSQ objective of developi g secu e, t usted a d qua tum- esilie t i f ast uctu e ac oss the semico ducto , cybe secu ity a d space laye s.

WISeSat’s ole i this ecosystem is focused o satellite i f ast uctu e. SEALSQ’s pla ed Qua tum Spatial O bital Cloud, o QSOC, is expected to be a SEALSQ-ow ed qua tum a d qua tum- esilie t i itiative i te ded to use WISeSat satellite capacity a d i f ast uctu e as pa t of a futu e o bital laye fo qua tum key dist ibutio (“QKD”), qua tum a dom umbe ge e atio (“QRNG”), post-qua tum ide tity a d othe secu e commu icatio s se vices. A y such use would emai subject to defi itive ag eeme ts, tech ical validatio , fi a ci g, egulato y app ovals, lau ch cade ce a d custome dema d.

Ca los Mo ei a, Fou de a d CEO of WISeKey, said: “FOSSA has bee a key i dust ial pa t e i i the ea ly developme t of WISeSat’s satellite capabilities, p ovidi g c itical tech ical expe tise a d flight he itage as we established ou i itial p ese ce i low Ea th o bit. This i vestme t eflects ou co fide ce i FOSSA’s platfo m a d ou sha ed visio fo scalable, secu e satellite i f ast uctu e. As we t a sitio f om pilot missio s to a mo e adva ced a d i teg ated o bital a chitectu e, st e gthe i g this elatio ship is a impo ta t step i de- iski g executio a d accele ati g ou oadmap.”

M . Mo ei a co ti ued, “At the same time, we see a clea a d g owi g ma ket oppo tu ity as Eu ope p io itizes sove eig , esilie t a d secu e space-based commu icatio s. By combi i g WISeSat’s satellite i f ast uctu e oadmap with WISeKey’s Root of T ust a d SEALSQ’s post-qua tum semico ducto capabilities, we a e buildi g the fou datio s fo a t usted Eu opea space-tech ology platfo m desig ed fo the ext e a of secu e commu icatio s. We believe this i teg ated app oach positio s us to captu e lo g-te m value i secu e commu icatio s, IoT co ectivity a d futu e qua tum- esilie t applicatio s.”

Juliá Fe á dez, CEO of FOSSA Systems, said: “FOSSA a d WISeSat have wo ked togethe si ce the ea ly stages of WISeSat’s satellite oadmap. We welcome WISeSat’s co ti ued suppo t as pa t of ou Se ies B fi a ci g ou d a d look fo wa d to explo i g fu the coope atio a ou d small-satellite i f ast uctu e, secu e commu icatio s a d futu e missio capabilities.”

About FOSSA SystemsFOSSA Systems specializes i satellite-based commu icatio s a d i tellige ce solutio s fo i dust ial a d defe se applicatio s. The compa y i teg ates the desig a d ope atio of satellites, g ou d statio s, a d IoT devices, e abli g co ectivity f om low Ea th o bit (LEO). Si ce 2022, it has lau ched 25 satellites a d is deployi g a co stellatio of 140 to p ovide global IoT cove age. Its solutio s a e used ac oss secto s such as e e gy, utilities, oil & gas, logistics, a d c itical i f ast uctu e, as well as i secu ity a d defe se. Fou ded i 2020 by Juliá Fe á dez a d Vice te Go zález, the compa y wo ks with i te atio al clie ts i cludi g Mic osoft a d Eu opea mi ist ies of defe se. It is headqua te ed i Mad id, with offices i Lisbo a d Tokyo.Lea mo e at FOSSA Systems

About WISeSat.SpaceWISeSat develops, p ocu es a d ope ates small-satellite i f ast uctu e, ights-of-use a a geme ts a d associated g ou d-segme t capabilities i Low Ea th O bit. As the space-i f ast uctu e platfo m suppo ti g SEALSQ’s pla ed QSOC oadmap, WISeSat is expected to p ovide satellite capacity a d o bital i f ast uctu e that SEALSQ may use fo post-qua tum secu ity a d qua tum-e abled se vices, subject to defi itive ag eeme ts, tech ical validatio , fi a ci g, egulato y app ovals, lau ch cade ce a d custome dema d.

About SEALSQSEALSQ is a leadi g i ovato i Post-Qua tum Tech ology ha dwa e a d softwa e solutio s. Ou tech ology seamlessly i teg ates Semico ducto s, PKI (Public Key I f ast uctu e), a d P ovisio i g Se vices, with a st ategic emphasis o developi g state-of-the-a t Qua tum Resista t C yptog aphy a d Semico ducto s desig ed to add ess the u ge t secu ity challe ges posed by qua tum computi g. As qua tum compute s adva ce, t aditio al c yptog aphic methods like RSA a d Elliptic Cu ve C yptog aphy (ECC) a e i c easi gly vul e able.

SEALSQ is pio ee i g the developme t of Post-Qua tum Semico ducto s that p ovide obust, futu e-p oof p otectio fo se sitive data ac oss a wide a ge of applicatio s, i cludi g Multi-Facto Authe ticatio toke s, Sma t E e gy, Medical a d Healthca e Systems, Defe se, IT Netwo k I f ast uctu e, Automotive, a d I dust ial Automatio a d Co t ol Systems. By embeddi g Post-Qua tum C yptog aphy i to ou semico ducto solutio s, SEALSQ e su es that o ga izatio s stay p otected agai st qua tum th eats. Ou p oducts a e e gi ee ed to safegua d c itical systems, e ha ci g esilie ce a d secu ity ac oss dive se i dust ies.

Fo mo e i fo matio o ou Post-Qua tum Semico ducto s a d secu ity solutio s, please visit www.sealsq.com.

About WISeKeyWISeKey I te atio al Holdi g Ltd (“WISeKey”, SIX: WIHN; Nasdaq: WKEY) is a global leade i cybe secu ity, digital ide tity, a d IoT solutio s platfo m. It ope ates as a Swiss-based holdi g compa y th ough seve al ope atio al subsidia ies, each dedicated to specific aspects of its tech ology po tfolio. The subsidia ies i clude (i) SEALSQ Co p (Nasdaq: LAES), which focuses o semico ducto s, PKI, a d post-qua tum tech ology p oducts, (ii) WISeKey SA, which specializes i RoT a d PKI solutio s fo secu e authe ticatio a d ide tificatio i IoT, blockchai , a d AI, (iii) WISeSat AG which focuses o space tech ology fo secu e satellite commu icatio , specifically fo IoT applicatio s, (iv) WISe.ART Co p which focuses o t usted blockchai NFTs a d ope ates the WISe.ART ma ketplace fo secu e NFT t a sactio s, a d (v) SEALCOIN AG which focuses o dece t alized physical i te et with DePIN tech ology a d houses the developme t of the SEALCOIN platfo m.

Each subsidia y co t ibutes to WISeKey’s missio of secu i g the i te et while focusi g o thei espective a eas of esea ch a d expe tise. Thei tech ologies seamlessly i teg ate i to the comp ehe sive WISeKey platfo m. WISeKey secu es digital ide tity ecosystems fo i dividuals a d objects usi g blockchai , AI, a d IoT tech ologies. With ove 1.6 billio mic ochips deployed ac oss va ious IoT secto s, WISeKey plays a vital ole i secu i g the I te et of Eve ythi g. T usted by the OISTE/WISeKey c yptog aphic Root of T ust, WISeKey p ovides secu e authe ticatio a d ide tificatio fo IoT, blockchai , a d AI applicatio s. The WISeKey Root of T ust e su es the i teg ity of o li e t a sactio s betwee objects a d people. Fo mo e i fo matio o WISeKey’s st ategic di ectio a d its subsidia y compa ies, please visit www.wisekey.com.

Fo wa d-Looki g Stateme tsThis commu icatio co tai s fo wa d-looki g stateme ts co ce i g WISeKey I te atio al Holdi g Ltd a d/o its subsidia ies (collectively, “WISeKey,” “ou ” o “us”) a d its busi esses. Fo wa d-looki g stateme ts ca be ide tified by te ms such as “a ticipate,” “believe,” “estimate,” “expect,” “i te d,” “may,” “pla ,” “p oject,” “will,” a d simila exp essio s. These stateme ts i volve k ow a d u k ow isks, u ce tai ties a d othe facto s that could cause WISeKey’s actual esults, fi a cial co ditio , pe fo ma ce o achieveme ts to diffe mate ially f om a y futu e esults, pe fo ma ce o achieveme ts exp essed o implied by such fo wa d-looki g stateme ts. These facto s i clude: ou ability to co ve t ou pipeli e i to actual sales; the ability to ealize WISeKey’s a ticipated g owth st ategies a d p ofitability; the developme t of post-qua tum c yptog aphy p oducts a d the pote tial ma ket fo such p oducts; WISeKey’s pla s fo global custome base expa sio ; the expa sio of the WISeSat p oject a d the QSOC i itiative; the timi g a d expected eve ues f om the comme cial deployme t of the QS7001 qua tum- esista t semico ducto ; the sufficie cy of cash to meet liquidity eeds; WISeKey’s ability to att act a d etai custome s; cha ges i eco omic co ditio s; ma ket dema d a d semico ducto i dust y co ditio s; a d the isks discussed i WISeKey’s fili gs with the SEC. WISeKey is p ovidi g this commu icatio as of this date a d does ot u de take to update a y fo wa d-looki g stateme ts as a esult of ew i fo matio , futu e eve ts o othe wise.

Stateme ts ega di g ou busi ess pipeli e a e based o ma ageme t’s cu e t estimates of pote tial eve ue oppo tu ities a d do ot ep ese t backlog o co t acted eve ue. Pipeli e co ve sio is subject to ume ous facto s i cludi g custome validatio , tech ical i teg atio equi eme ts, ce tificatio timeli es, a d ma ket co ditio s. The e ca be o assu a ce that pipeli e oppo tu ities will co ve t to actual sales o that such co ve sio will occu withi a ticipated timef ames.

This p ess elease does ot co stitute a offe to sell, o a solicitatio of a offe to buy, a y secu ities, a d it does ot co stitute a offe i g p ospectus withi the mea i g of the Swiss Fi a cial Se vices Act (“Fi SA”), the Fi SA’s p edecesso legislatio o adve tisi g withi the mea i g of the Fi SA. I vesto s must ely o thei ow evaluatio of WISeKey a d its secu ities, i cludi g the me its a d isks i volved. Nothi g co tai ed he ei is, o shall be elied o as, a p omise o ep ese tatio as to the futu e pe fo ma ce of WISeKey. Give the isks a d u ce tai ties desc ibed he ei , you should ot place u due elia ce o fo wa d-looki g stateme ts as a p edictio of actual esults.

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