Shares in container liner operators posted gains on Friday after a key freight rate indicator leapt 19% in two weeks and reached its highest point of the year.

Shares in Taiwan’s Yang Ming Marine Transport and Israel’s Zim led the day’s upward march as the Shanghai Containerized Freight Index hit 2,306.

That was a gain of 365 points since the last reading two weeks earlier, before the International Labour Day Holiday closed the Shanghai Shipping Exchange.