Background The literature on the ethics of biobanking often overlooks the practical operations of biobanks. The ethics of stewardship requires that biobank resources are used to conduct beneficial science. Networked biobanks have emerged to increase the scientific benefit of biobank resources, but little is known about whether and how operations of networking may accomplish this goal.Methods As part of a larger study on the ethical, legal, and social implications (ELSI) of networked biobanking, we conducted 38 interviews with representatives of 31 (...) networked biobanks. Interviews explored operations of the networks. We used thematic analysis to examine how respondents describe three topics associated with stewarding biobank resources—funding, utilization, and sustainability.Results Our results highlight that funding, utilization, and sustainability are critical not only to the operation of biobanks, but also to the ethical obligations that biobankers owe to stakeholders to steward the resources. Based on prior research, we hypothesized that respondents would describe networking as beneficial to increasing funding, utilization, and sustainability of the network. Respondents generally found value in networked biobanking, but networking did not necessarily increase funding, utilization, and sustainability.Conclusion The results presented here support inclusion of funding, utilization, and sustainability as topics of ethical concern in the practice of biobanking and networked biobanking. These issues are rooted in the stewardship obligations that biobankers feel to their partners, client investigators, and participants. The goal of promoting stewardship through networking requires significant time and effort to build governance models that honor the obligations of each individual biobank to their donors and advance the collective goals of the network. We conclude with suggestions offered by respondents to address improving these aspects of stewardship. (shrink)