Aquinas argues in De Ente et Essentia that quantitative extension follows from matter as a principle of individuation, making it a consequent property rather than a constitutive differentia.

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Aquinas: Thomas Aquinas was a medieval Italian priest and philosopher (1225-1274) who became one of the most influential thinkers in Western history. He attempted to show that Christian faith and human reason are compatible, arguing that we can use logic and observation to understand God and the natural world. His ideas deeply shaped Catholic theology and continue to influence how religious and secular institutions think about ethics, knowledge, and the relationship between science and belief.
Consequent property(the category Aquinas assigns to quantitative extension): A characteristic that follows from or results from something else, rather than being essential to it—like 'being wet' is a consequent property of being a raindrop, not what makes it a raindrop.
Constitutive differentia(what quantitative extension is NOT, according to Aquinas): A defining characteristic that actually makes something what it is—for example, 'being rational' is a constitutive differentia of humans because it helps define what a human is.
De Ente et Essentia(the specific text being referenced)

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