Dry bulk and containership owners are continuing their rampant run in US stock trading, helping to lift shipping to a strong first half of 2021.

Bulker stocks posted a one-week gain of 15% on Friday while boxship shares soared 14%, leading the 31 stocks under the coverage of investment bank Jefferies to a 7.2% overall lift. Jefferies Shipping Index has now climbed more than 70% in the year to date.