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Portrait of Willem Hoorneman

Willem Hoorneman

Managing Partner
Advocaat

CMS
Atrium - Parnassusweg 737
1077 DG Amsterdam
PO Box 94700
1090 GS Amsterdam
Netherlands
Languages English, Dutch

Willem Hoorneman has been managing partner of CMS in the Netherlands since 2016. He is a member of the IP/TMC Practice Group, especially within Life Sciences. With energy and commitment Willem heads the Life Sciences Group in the Netherlands which stands for new growth.

With more than 30 years of experience in intellectual property (IP) and author of the patent chapters in the leading handbook on software protection in the Netherlands, Willem is considered a pre-eminent IP lawyer, and one of the very best in the field of patent law. In addition, for years he was editor-in-chief of the BMM Bulletin, a leading magazine on trademark and design law in the Benelux. Willem is internationally recognized for his expertise.

Willem has earned an excellent reputation as a litigator for various IP matters. He is also a panelist of the World Intellectual Property Organization (WIPO) for domain name alternative dispute resolution.

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Willem Hoorneman is Recommended.

The Legal500 EMEA, 2022

Recommended by the Legal500 EMEA 2021

Legal500 EMEA, 2021

Willem Hoorneman is rated Patent star 2020/21 on Patent litigation

IP Stars

Willem Hoorneman is recommended.

The Legal 500, 2019

Memberships & Roles

  • Head of CMS Life Sciences Sector Group
  • Managing Partner
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Education

  • Dutch Law, University of Amsterdam
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01/02/2022
Mar­cel Ab­bringh ap­poin­ted COO at CMS
Mar­cel Ab­bringh (52) has been ap­poin­ted as Chief Op­er­at­ing Of­ficer (COO) of CMS in the Neth­er­lands as per 1 Feb­ru­ary 2022. He suc­ceeds Bar­bara Lam­berts, who left CMS after nearly six years to fo­cus more...
01/06/2021
CMS In­tel­lec­tu­al Prop­erty Glob­al Bro­chure
The pan­dem­ic that will define 2020 has put many types of in­tel­lec­tu­al prop­erty in the spot­light – par­tic­u­larly, of course, in life sci­ences. Who will de­vel­op an ef­fect­ive vac­cine or vac­cines for Cov­id-19...
17/12/2020
CMS in the Neth­er­lands to one loc­a­tion in 2022
CMS in the Neth­er­lands will be op­er­at­ing solely from the Am­s­ter­dam of­fice as of, at the latest, Septem­ber 2022. The Utrecht and Am­s­ter­dam of­fices will there­fore be merged. This de­cision marks an im­port­ant...
14/07/2020
CMS an­nounces glob­al rev­en­ues of € 1.426bn in 2019
CMS an­nounces glob­al rev­en­ues of € 1.426bnSig­ni­fic­ant in­vest­ments in­clude Lupl, an open in­dustry plat­form, which has the po­ten­tial to trans­form the col­lab­or­a­tion between law firms and leg­al de­part­ments...
19/02/2020
CMS Re­cep­tion in Da­v­os 2020: Oliv­er Bäte and Wern­er Bau­mann
CMS in con­junc­tion with Ger­many’s lead­ing weekly news­pa­per Die Zeit, hos­ted its an­nu­al re­cep­tion in Da­v­os on 22 Janu­ary. This year the top­ic was “Chal­lenges and Busi­ness Op­por­tun­it­ies in the World...
12/02/2020
CMS Re­cep­tion in Da­v­os 2020: Lu­isa Neubauer
CMS in con­junc­tion with Ger­many’s lead­ing weekly news­pa­per Die Zeit, hos­ted its an­nu­al re­cep­tion in Da­v­os on 22 Janu­ary. This year the top­ic was “Chal­lenges and Busi­ness Op­por­tun­it­ies in the World...
05/02/2020
CMS Re­cep­tion in Da­v­os 2020: Laura Ru­das (Pa­lantir Tech­no­lo­gies)
CMS in con­junc­tion with Ger­many’s lead­ing weekly news­pa­per Die Zeit, hos­ted its an­nu­al re­cep­tion in Da­v­os on 22 Janu­ary. This year the top­ic was “Chal­lenges and Busi­ness Op­por­tun­it­ies in the World...
31/01/2020
CMS re­leases pod­cast series on chal­lenges and busi­ness op­por­tun­it­ies in...
Cli­mate change, di­git­al trans­form­a­tion and in­creas­ing auto­ma­tion have trans­formed the world of busi­ness. With even more sig­ni­fic­ant changes on the ho­ri­zon, busi­nesses will have to ad­opt new, in­nov­at­ive...
29/01/2020
CMS Re­cep­tion in Da­v­os 2020: In­tro­duc­tion by Pierre-Sé­bas­tien Thill (CMS)
CMS in con­junc­tion with Ger­many’s lead­ing weekly news­pa­per Die Zeit, hos­ted its an­nu­al re­cep­tion in Da­v­os on 22 Janu­ary. This year the top­ic was “Chal­lenges and Busi­ness Op­por­tun­it­ies in the World...
24/01/2020
Busi­nesses are key to solv­ing our world’s cur­rent and fu­ture prob­lems
At a re­cep­tion in Da­v­os hos­ted by CMS and the Ger­man news­pa­per DIE ZEIT, Laura Ru­das (Vice Pres­id­ent Strategy, Pa­lantir Tech­no­lo­gies Inc), Wern­er Bau­mann (CEO, Bay­er AG) and Oliv­er Bäte (CEO, Al­li­anz...
21/11/2019
CMS Glob­al Life Sci­ences & Health­care For­um 2019
 We have the pleas­ure to cor­di­ally in­vite you to our    on Thursday, 21 Novem­ber 2019, at 09:30 CET in Frank­furt.The For­um will provide in­sights from ex­tern­al ex­perts and CMS spe­cial­ists on four core...
07/10/2019
CMS ex­pands in Africa
Frank­furt, 7 Oc­to­ber 2019. CMS an­nounces that RM Part­ners and Daly & In­am­dar Ad­voc­ates, based in South Africa and Kenya re­spect­ively, have today joined the lead­ing glob­al law firm. Go­ing for­ward, they...