The proliferation of for-profit enterprises offering stem cell storage services for personal use illustrates one of the ways health is increasingly governed through uncertainty and speculative notions of risk. Without any firm guarantee of therapeutic utility, commercial stem cell banks offer to store a range of bodily tissues, signalling the further transformation of the living body into an accumulation strategy within biotechnology capitalism’s ‘tissue economies’. This article makes two related claims: first, it suggests that specifically gendered forms of identification with the leading edge of the bioeconomy are embedded in the speculative practices of commercial stem cell banking and are particularly visible in the recent creation of a banking service for endometrial tissue marketed directly to women. Second, the article offers a novel analytic through which to explore the commercial banking of one’s own bodily tissues (or ‘autologous’ banking) through Marx’s discussion of money hoarding. The aim of the article is to thus further the conceptual claims linking emergent forms of economic and biomedical subjectivity to transformations in biotechnology capital.