These "legacy pots" are at risk of being eroded by management fees while lying dormant, according to wealth manager Netwealth.
Job changes lead to savers losing track of their pensions, with 42% of those impacted reporting they do not have access to between two and five of their pots.
The findings were "clearly concerning" and prevent consumers from being able to plan with confidence, said Charlotte Ransom, CEO of Netwealth in Sky News' article.