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Photographer: Louis Lanzano/Bloomberg Photographer: Louis Lanzano/Bloomberg

Martin Shkreli, who rose to infamy by dramatically increasing the prices of vital drugs and was arrested Thursday on securities fraud charges, pinned a tweet to the top of his Twitter feed Saturday saying that he was confident he would prevail.

“The allegations against me are baseless and without merit,” Shkreli, who resigned as chief executive officer of biotechnology company Turing Pharmaceuticals LLC on Friday, wrote to his almost 35,000 Twitter followers. That sat above a retweet he had posted of a Vanity Fair profile from a day earlier, and a link to a Dec. 17 statement that also said Shkreli expected to be “fully vindicated.”

Prosecutors have charged Shkreli, 32, with illegally taking stock from Retrophin Inc., a biotechnology firm he started in 2011, and using it to pay off debts from unrelated business dealings. He was later ousted from the company, where he’d been CEO, and sued by its board. Shkreli has previously denied any wrongdoing related to the matter.