At 0129 GMT, NOL shares were up 3.6 percent at S$1.15, outperforming the broader Straits Times Index which was 1.6 percent higher.
"An alliance prevents the liners from price-cutting to get market share, so it's positive. I think the trend in the industry will accelerate," said a local analyst.
The partnership will create a container shipping alliance with more than 90 ships in nine services calling at more than 40 ports in Asia, Europe and the Mediterranean, NOL said in a statement on Tuesday.