This is an announcement for the paper "On the action of Lipschitz functions on vector-valued random sums" by Jan van Neerven and Mark Veraar. Abstract: Let $X$ be a Banach space and let $(\xi_j)_{j\ge 1}$ be an i.i.d. sequence of symmetric random variables with finite moments of all orders. We prove that the following assertions are equivalent: (1). There exists a constant $K$ such that $$ \Bigl(\E\Big\|\sum_{j=1}^n \xi_j f(x_j)\Big\|^2\Bigr)^{\frac12} \leq K \n f\n_{\rm Lip} \Bigl(\E\Big\|\sum_{j=1}^n \xi_j x_j\Big\|^2\Bigr)^{\frac12} $$ for all Lipschitz functions $f:X\to X$ satisfying $f(0)=0$ and all finite sequences $x_1,\dots,x_n$ in $X$. (2). $X$ is isomorphic to a Hilbert space. Archive classification: Functional Analysis; Probability Mathematics Subject Classification: 46C15, 46B09, 47B10 Remarks: 8 pages, to appear in Archiv der Mathematik (Basel) The source file(s), lipschitzA.tex: 27762 bytes, is(are) stored in gzipped form as 0504452.gz with size 9kb. The corresponding postcript file has gzipped size 56kb. Submitted from: m.c.veraar@math.tudelft.nl The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/math.FA/0504452 or http://arXiv.org/abs/math.FA/0504452 or by email in unzipped form by transmitting an empty message with subject line uget 0504452 or in gzipped form by using subject line get 0504452 to: math@arXiv.org.