Scottish investment manager Baillie Gifford & Co has more than doubled its stake in Kirby.
According to Securities and Exchange Commission filings, Baillie Gifford bumped up its position in the New York-listed, Houston-based offshore player to 12.84% from 5.25%.
The firm now owns 7.7 million shares, up from 3.1 million.
Kirby is one of two maritime companies in the Edinburgh company's portfolio. Alongside giants like Amazon, Microsoft and Alibaba, it also owns 4.7 million shares of Royal Caribbean Cruise Lines.
For the third quarter of 2018, Kirby bested analyst expectations, with earnings per share coming in at $0.70, several cents better than predicted.
The company posted a nearly $42m profit, with chief executive David Grzebinski citing increasing petrochemical and oil volumes, lock closures and refinery turnarounds for the better-than-expected performance.
