Based on the provided sources, a comprehensive list of fifteen of Seagate Technology's largest clients is not available. However, the sources do identify some significant customers and the types of entities Seagate sells to.

According to one source, Dell Inc. accounted for approximately 13% of Seagate Technology Holdings Plc's consolidated revenue, while Hewlett-Packard Company accounted for approximately 10% of consolidated revenue. These figures suggest that Dell and Hewlett-Packard are among Seagate's largest customers based on revenue contribution[1].

The sources also indicate that Seagate sells its products to major OEMs (Original Equipment Manufacturers), distributors, and retailers[1]. OEM customers typically enter into master purchase agreements covering pricing, volume discounts, order lead times, and product support obligations[1]. Distributors generally have non-exclusive agreements for resale and provide non-binding indications of near-term requirements[1]. The retail channel involves branded storage products sold to retailers directly or through distributors, often requiring greater marketing support, sales incentives, and price protection[1].

While the sources confirm Seagate sells to a variety of large entities including major OEMs, distributors, and retailers, and specifically name Dell and Hewlett-Packard as significant revenue contributors, they do not provide a list of fifteen of Seagate's largest clients by name or rank[1] [2].

Another source mentions that their research team identifies companies using Seagate Technology applications such as CORTX for Cloud Storage and Seagate EVault Backup and Recovery Software[2]. This source lists companies evaluating Seagate applications, including Wawasan Open University, City of Westfield, MA, and California State University, Fullerton, but does not identify them as overall largest clients for all Seagate products[2].

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