Share of Wallet（SOW）通常译为“钱包份额”或“荷包占有率”。

可以先来看Investopedia网站对SOW的解释： Share of wallet (SOW) is the dollar amount an average customer regularly devotes to a particular brand rather than to competing brands in the same product category. Companies try to maximize an existing customer's share of wallet by introducing multiple products and services to generate as much revenue as possible from each customer. A marketing campaign, for example, may have a stated goal of increasing the brand's wallet share for specific customers at the expense of its competitors.

译文参考：钱包份额/荷包占有率是普通顾客定期为特定品牌（而不是同一产品类别中的竞争品牌）投入的金额。公司试图通过引入多种产品和服务来最大化现有顾客的钱包份额，以从每个顾客那里获得尽可能多的收入。例如，营销活动可能有一个既定目标，即以牺牲竞争对手的利益为代价，为特定顾客增加品牌的钱包份额。

如：

The success of this approach is reflected not only in a high retention rate of clients but also in the increasing share-of-wallet of XX.

这一做法的成功不仅体现在我们居高不下的客户留存率上，也体现在XX日益攀升的荷包占有率上。