Navios Maritime Holdings is extending an offer to swap preferred shares for cash or common stock after investors tendered $17.9m worth of the high-yield securities so far.

The New York-listed bulker owner, which is the parent of the Navios group of companies, said that nearly 552,000 Series G preferred shares were tendered.

The Angeliki Frangou-led company had been offering $7.18 in cash or 6.29