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**Abstract.** We construct stable vector bundles on the space of symmetric forms of degree $d$ in $n+1$ variables which are equivariant for the action of $\text{SL}_{n+1}(\mathbb{C})$, and admit an equivariant free resolution of length 2. For $n=1$, we obtain new examples of stable vector bundles of rank $d-1$ on $\mathbb{P}^d$, which are moreover equivariant for $\text{SL}_2(\mathbb{C})$. The presentation matrix of these bundles attains Westwick’s upper bound for the dimension of vector spaces of matrices of constant rank and fixed size.