Utilize the input text as a context reference, choose the right relationship between 'Pimco' and 'Investment Management' from the options.
Options: operator, original broadcaster, product/material produced, position held

Pacific Investment Management Co, which is known as Pimco and is a unit of Germany's Allianz SE, said the Pimco Total Return Fund increased its holdings in U.S. government-related securities to 19.6 percent in June, up from 8.5 percent in May.
product/material produced