Ardmore Shipping's top shareholders are changing ranks according to US securities regulatory filings.
Among those are Boston Partners, which reported holding 1.67 million shares in the product tankers owner, amounting to a 5% stake.
Boston Partners, which has just over $99.2bn under management, focuses on value and small-capitalisation stocks in the US and abroad.
Boston, which has been an Ardmore shareholder since 2015, last reported holding 1 million shares in the company as of November 2017.
