Is it permissible to invest in a company that cultivates spirulina algae, given that it imports algal starter cultures, and that the partnership involves funding from the investor and management from the company? And does the ruling differ if the starter cultures are purchased with the investor's money after the contract, or if they are already stored by the company?

Possession is not a condition for purchasing algae starters with money. It is permissible to buy them at a deferred price or to pay the price in advance with deferred delivery. Possession is only a condition in transactions involving riba an-nasia (usury of delay), such as currency exchange, and the purchase of gold, silver, and food of the same kind. The fact that the company invests money in algae starters or imports with another currency is permissible and poses no problem, as long as the investment itself is permissible.