Damien McGuinness, a correspondent for the BBC, said that prosecutors suspect Sergej W. took out a loan and then purchased put options on shares of the soccer team - Borussia Dortmund - worth around $83,000.
The 28-year-old suspect, who has dual German and Russian citizenship, faces charges of attempted murder, causing an explosion and inflicting serious bodily harm.
The federal chief prosecutors said the attacker identified as "Sergei V", had bought options on the day of the attack entitling him to sell shares in Borussia Dortmund at a pre-determined price.
German police have arrested a man suspected of carrying out the Borussia Dortmund bus bombing.
The incident occurred ahead of the first leg of a Champions League quarter-final between the Bundesliga side and Monaco on April 11.
The suspect is accused of planting three bombs last week packed with metal pins near the hotel where the team was staying and detonated them as the bus left for a match against AS Monaco.
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He spoke in defence of ordinary people who he said spent their lives working hard and in the end were left with nearly nothing. Upon Jeremy Corbyn's election as Labour leader in 2015, his son stepped up to become the Shadow Chancellor's chief of staff.
Prosecutors said that shares in the club could have dropped significantly if a player had been seriously injured or killed in the attack.
"The man appears to have wanted to commit murder out of greed", said Ralf Jager, the state interior minister of North Rhine-Westphalia. They previously described the explosive devices as "very professional" but the main explosive device was badly placed and most of its explosive power - with a 100m radius - missed the bus.
Federal prosecutors said they were investigating the latest claim amid speculation that the original letter "may have been a ploy to frame Islamists and divert investigators from the true perpetrators, while stoking tensions", says The Independent. The GBA's statement said that the bus had no armored protection or bulletproof windows.
The fact that, aside from Bartra and the policeman, "no others were wounded or even killed, was - as we know today - exclusively due to huge luck", BVB said in its statement Friday.
Team captain Marcel Schmelzer said the side hoped "we will learn the actual background of the attack" which would help "all those who sat on the bus. come to terms with" the traumatic event.
Police found three copies of identical statements that mentioned last December's Islamist terrorist attack on a Berlin Christmas market and referenced the "caliphate". But experts said the letter's mix of correct, complicated German and obvious mistakes suggested it was a red herring - as were two subsequent claims pointing to left-wing and right-wing extremists.
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