United's remuneration report, due to be revealed at the company's annual meeting next week, is likely to be voted out by shareholders because powerful investor groups are issuing warnings against the quarter-of-a-million payout.
According to the Financial Times, the Association of British Insurers have issued a "red-top" message to its members indicating the highest level of concern.
The National Association of Pensioners is also urging members to rebel against the report.
In addition, the Research, Recommendations and Electronic Voting Advisory service is calling on shareholders not to re-elect current United non-executive director and former chairman of BMP DDB, Chris Powell, because he approved the payout.
Hollick is set to stand down later this month and the payout was revealed in the company's annual report as helping to ensure a "successful handover" to incoming chief executive David Levin.
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