Proxy-advisory firm Glass Lewis & Co. is recommending PartnerRe Ltd. shareholders vote against its proposed $11 billion tie-up with Axis Capital Holdings Ltd., saying that an offer from Italian investment firm Exor SpA is more attractive.

The recommendation mirrors that of fellow proxy adviser Institutional Shareholder Services Inc. on Friday.

PartnerRe and Axis agreed to merge in January and form one of the world's biggest reinsurance and specialist insurance companies. But Exor, which owns a controlling stake in Fiat Chrysler Automobiles, has been pursuing PartnerRe with its own offer in recent months.

Including a recently added $3 dividend, Exor's offer for PartnerRe would be valued at $140.50 a share. In comparison, Axis's offer values PartnerRe at just over $139, based on Friday's closing price.

In its recommendation, Glass Lewis said Exor's offer carries fewer execution and integration risks than Axis's.

"Even with some similarity and familiarity between the two companies, difficulties often arise once it becomes time to combine two disparate entities with separate businesses, structures and philosophies, particularly when reducing staff and continuing to operate in a challenging and competitive environment," Glass Lewis wrote in its recommendation.

A representative for Axis didn't immediately respond to requests for comment.

Shareholders are scheduled to vote on the deal next month.

Many big institutional investors rely on proxy-advisory firms to help formulate their votes on mergers and other corporate actions. Their recommendations can sway the outcome of such votes.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

Access Investor Kit for AXIS Capital Holdings Ltd.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=BMG0692U1099

Access Investor Kit for PartnerRe Ltd.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=BMG6852T1053

Access Investor Kit for Exor SpA

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=IT0001353140

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