'Risk money' refers to capital invested in high-risk, high-return investments.

Literal

Risk-money [definitional-とは], high-risk [while-ながら] high-return [object-を] seek investment [to-に] injected capital [possessive-の] [nominalizer-こと] [object-を] say.

Another definition using ~とは...をいう. ながら here means 'while being / despite being' — the investment is high-risk yet seeks high returns. 投入される (is injected into) is passive, describing the flow of capital. A dense financial definition.