The activists aim to undermine work at Oxford University's £18m animal testing laboratory, which is being built by Montpellier subsidiary Walter Lilly & Co.
A company spokesperson said: "These letters purport to be from certain members of the senior management team at Montpellier. This is false."
The activists, who have not been identified, warned that investors had a month to sell their shares, or their details would be published on the internet.
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