WISeKey Files Registration Statement on Form F-4 with the U.S. Securities and Exchange Commission in Connection with Proposed Redomiciliation to the British Virgin Islands

Zug, Switze la d, July 17, 2026 – Ad-Hoc a ou ceme t pu sua t to A t. 53 of SIX Listi g Rules – WISeKey I te atio al Holdi g Ltd (“WISeKey”) (SIX: WIHN; Nasdaq: WKEY) a ou ced that WISeKey I te atio al Co p., a B itish Vi gi Isla ds compa y a d wholly ow ed subsidia y of WISeKey (“WISeKey BVI”), has publicly filed o July 16, 2026, a egist atio stateme t o Fo m F-4 with the U.S. Secu ities a d Excha ge Commissio (the “SEC”) i co ectio with WISeKey’s p oposed edomiciliatio f om Switze la d to the B itish Vi gi Isla ds.

The egist atio stateme t i cludes a p elimi a y p ospectus elati g to the p oposed me ge of WISeKey with a d i to WISeKey BVI to effect the edomiciliatio , with WISeKey BVI su vivi g the me ge as the publicly t aded pa e t compa y of the WISeKey g oup a d successo to WISeKey.

The p oposed me ge emai s subject to a umbe of co ditio s, i cludi g app oval by WISeKey sha eholde s at a ext ao di a y ge e al meeti g of sha eholde s, the egist atio stateme t bei g decla ed effective by the SEC, the eceipt of the equi ed Nasdaq a d SIX Swiss Excha ge listi g autho izatio s, the co fi matio by the Swiss Takeove Boa d that WISeKey BVI will be subject to the same opti g-out f om the ma dato y takeove p ovisio s as WISeKey, a d the satisfactio of the othe egulato y, legal a d p ocedu al co ditio s desc ibed i the egist atio stateme t.

The ext ao di a y ge e al meeti g (the “EGM”) at which WISeKey sha eholde s will be asked to app ove the me ge is cu e tly expected to be held o Septembe 9, 2026. The EGM i vitatio will be made available i due cou se. Fu the i fo matio ega di g the EGM, the p oposed me ge , the excha ge of WISeKey sha es a d Ame ica Deposita y Sha es, a d the ights of sha eholde s is co tai ed i the p ospectus i cluded i the egist atio stateme t. I additio , WISeKey sha eholde s will eceive access to copies of the me ge ag eeme t, the me ge epo t, a d the audit co fi matio the eo , as well as WISeKey’s sta dalo e a d co solidated a ual fi a cial stateme ts fo the fi a cial yea s 2025, 2024 a d 2023, a d the sta dalo e fi a cial stateme ts of WISeKey BVI as of a d fo the pe iod e ded Decembe 31, 2025, o late tha 30 days befo e the EGM.

The egist atio stateme t has ot yet become effective, a d the i fo matio co tai ed i it emai s subject to completio a d ame dme t. The fili g of the egist atio stateme t does ot co stitute completio o app oval of the p oposed me ge , a d the e ca be o assu a ce that the me ge will be completed o the a ticipated timeli e o at all.

The egist atio stateme t may be accessed th ough the SEC’s website at www.sec.gov u de WISeKey BVI’s fili gs.

About WISeKeyWISeKey (NASDAQ: WKEY; SIX Swiss Excha ge: WIHN) is a leadi g global cybe secu ity compa y cu e tly deployi g la ge scale digital ide tity ecosystems fo people a d objects usi g Blockchai , AI a d IoT especti g the Huma as the Fulc um of the I te et. WISeKey mic op ocesso s secu e the pe vasive computi g shapi g today’s I te et of Eve ythi g. WISeKey IoT has a i stall base of ove 1.5 billio mic ochips i vi tually all IoT secto s (co ected ca s, sma t cities, d o es, ag icultu al se so s, a ti-cou te feiti g, sma t lighti g, se ve s, compute s, mobile pho es, c ypto toke s etc.).  WISeKey is u iquely positio ed to be at the edge of IoT as its semico ducto s p oduce a huge amou t of Big Data that, whe a alyzed with A tificial I tellige ce (AI), ca help i dust ial applicatio s to p edict the failu e of thei equipme t befo e it happe s.

Ou tech ology is t usted by the OISTE/WISeKey’s Swiss based c yptog aphic Root of T ust (“RoT”), which p ovides secu e authe ticatio a d ide tificatio , i both physical a d vi tual e vi o me ts, fo the I te et of Thi gs, Blockchai a d A tificial I tellige ce. The WISeKey RoT se ves as a commo t ust a cho to e su e the i teg ity of o li e t a sactio s amo g objects a d betwee objects a d people. Fo mo e i fo matio , visit www.wisekey.com.

P ess a d i vesto co tacts:

Disclaime :This commu icatio exp essly o implicitly co tai s ce tai fo wa d-looki g stateme ts co ce i g WISeKey I te atio al Holdi g Ltd a d its busi ess. Such stateme ts i volve ce tai k ow a d u k ow isks, u ce tai ties a d othe facto s, which could cause the actual esults, fi a cial co ditio , pe fo ma ce o achieveme ts of WISeKey I te atio al Holdi g Ltd to be mate ially diffe e t 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. WISeKey I te atio al Holdi g Ltd 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 co tai ed he ei as a esult of ew i fo matio , futu e eve ts o othe wise.

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”) 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.

Impo ta t Additio al I fo matio a d Whe e to Fi d It

I co ectio with the p oposed me ge , WISeKey BVI has filed with the U.S. Secu ities a d Excha ge Commissio (the “SEC”) a egist atio stateme t o Fo m F-4 that i cludes a p ospectus of WISeKey BVI (the “p ospectus”). WISeKey also i te ds to file othe eleva t docume ts with the SEC ega di g the p oposed t a sactio . INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT, THE PROSPECTUS, AND ANY OTHER RELEVANT DOCUMENTS FILED OR TO BE FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY, BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED MERGER. The egist atio stateme t, p ospectus, a d othe docume ts filed by WISeKey o WISeKey BVI with the SEC may be obtai ed f ee of cha ge at the SEC’s website at www.sec.gov o by di ecti g a equest to WISeKey I te atio al Holdi g Ltd, Ge e al-Guisa -St asse 6, 6300 Zug, Switze la d.

Pa ticipa ts i the Solicitatio

WISeKey, WISeKey BVI, a d thei espective di ecto s a d executive office s may be deemed to be pa ticipa ts i the solicitatio of p oxies f om WISeKey’s sha eholde s i co ectio with the p oposed me ge . I fo matio ega di g the i te ests of these di ecto s a d executive office s i the p oposed me ge is i cluded i the p ospectus. Additio al i fo matio ega di g WISeKey’s di ecto s a d executive office s is also i cluded i WISeKey’s A ual Repo t o Fo m 20-F fo the fiscal yea e ded Decembe 31, 2025, filed with the SEC. These docume ts a e available f ee of cha ge at the SEC’s website at www.sec.gov.

No Offe o Solicitatio

This commu icatio is fo i fo matio al pu poses o ly a d is ot i te ded to a d shall ot co stitute a offe to sell o the solicitatio of a offe to buy a y secu ities, o shall the e be a y sale of secu ities i a y ju isdictio i which such offe , solicitatio o sale would be u lawful p io to egist atio o qualificatio u de the secu ities laws of a y such ju isdictio . No offe i g of secu ities shall be made except by mea s of a p ospectus meeti g the equi eme ts of Sectio 10 of the U.S. Secu ities Act of 1933, as ame ded.

Cautio a y Stateme t Rega di g Fo wa d-Looki g Stateme ts

This commu icatio co tai s “fo wa d-looki g stateme ts” withi the mea i g of Sectio 27A of the U.S. Secu ities Act of 1933, as ame ded, a d Sectio 21E of the U.S. Secu ities Excha ge Act of 1934, as ame ded. Fo wa d-looki g stateme ts a e typically ide tified by wo ds such as “expect,” “a ticipate,” “i te d,” “pla ,” “believe,” “seek,” “estimate,” “will,” “should,” “would,” “could,” “may,” a d simila exp essio s. These fo wa d-looki g stateme ts i clude, but a e ot limited to, stateme ts ega di g: the a ticipated be efits of the p oposed edomiciliatio a d me ge ; the expected timi g of the completio of the p oposed t a sactio , i cludi g the expected timi g of the ext ao di a y ge e al meeti g; the satisfactio of co ditio s to the me ge , i cludi g egulato y app ovals; a d the expected listi g of WISeKey BVI sha es o Nasdaq a d SIX Swiss Excha ge.

These fo wa d-looki g stateme ts a e based o cu e t expectatio s, estimates, fo ecasts, a d p ojectio s about the i dust y a d ma kets i which WISeKey a d WISeKey BVI ope ate, a d ma ageme t’s beliefs a d assumptio s. These stateme ts a e ot gua a tees of futu e pe fo ma ce a d i volve isks, u ce tai ties, a d assumptio s that a e difficult to p edict. Impo ta t facto s that could cause actual esults to diffe mate ially f om fo wa d-looki g stateme ts i clude, but a e ot limited to: the isk that the me ge may ot be completed i a timely ma e o at all; failu e to obtai equi ed sha eholde app oval at the ext ao di a y ge e al meeti g; failu e to obtai equi ed egulato y app ovals, i cludi g f om Nasdaq, SIX Swiss Excha ge, o the Swiss Takeove Boa d, o failu e to satisfy othe closi g co ditio s; the isk that the SEC may ot decla e the egist atio stateme t effective; the isk that the a ticipated be efits of the edomiciliatio may ot be ealized; cha ges i applicable laws o egulatio s; ge e al eco omic a d ma ket co ditio s; a d othe isks a d u ce tai ties desc ibed i WISeKey’s fili gs with the SEC, i cludi g its A ual Repo t o Fo m 20-F. I vesto s a e cautio ed ot to place u due elia ce o these fo wa d-looki g stateme ts, which speak o ly as of the date of this commu icatio . WISeKey does ot u de take a y obligatio to update o evise a y fo wa d-looki g stateme ts, whethe as a esult of ew i fo matio , futu e eve ts, o othe wise, except as equi ed by law.