received anonymously:

"In the night of the 19th of December we went to the house of Cees Vermaas, a director of NYSE Euronext. [...] We covered his [...] house in slogans with spraypaint. Every single window they looked at from the inside and every door they went out was covered in slogans. [...]
Cees, we left a secret message on your living room window for you [...] :).

DROP HLS!

Cees Vermaas
Westeinde[...]
Noordwijkerhout"

*Communique has been edited for legal reasons.