As a corporate/M&A specialist, Klaas is the trusted adviser to a number of listed companies, large multinationals and private equity firms on a wide range of issues. These include public and private M&A, joint ventures, restructurings, corporate law, corporate governance and listing rules in the Netherlands and abroad. Klaas has extensive experience in cross-border M&A, assisting clients in their transactions outside their home country. In 2019 and 2020, Klaas was one of the six nominees for "Best M&A Lawyer"at the annual Dutch M&A Awards.

Klaas’s recent work includes advising:

• Egeria on its takeover of Fletcher Hotels from NIBC and Xead
• NN Group on its acquisition of Dutch insurance broker Heinenoord

• ICT Group on the recommended public offer by NPM Capital

• Just Eat Takeaway on the acquisition of Grubhub
• Royal Ahold Delhaize on the acquisition of DEEN Supermarkets
• Takeaway.com on its merger with Just Eat
• GrandVision in connection with the transfer of 76.62% of GrandVision’s shares from HAL to EssilorLuxottica
• Takeaway.com on the acquisition of Delivery Hero’s German food delivery operations and on the acquisition of the Israeli B2B food delivery platform 10bis
• Ramphastos on the acquisition of HEMA from Lion Capital
• Intergamma on the buy-out of its largest franchisee CRH/Van Neerbos
• ING Group on the acquisition of a 75% stake in Payvision
• HAL Investments on the acquisition of Van Wijnen, the acquistion of Deli Building Supplies, the sale of AudioNova to Sonova, and the acquisition of a 25% stake in Dutch Mortgage Funding Company
• NN Group on the sale of Mandema & Partners
• Grontmij on the recommended public offer by Sweco
• Klépierre on the recommended public exchange offer for Corio
• Royal Ahold Delhaize on the acquisition of SPAR’s Czech business and the divestment of its Slovakian activities
• Royal Ahold Delhaize on its acquisition of online retailer Bol.com
• Egeria on the divestment of NRC Media to Mediahuis Nederland and AXENT NabestaandenZorg to a.s.r.
• RELX on a number of divestments including Elsevier and various other publishing activities