This chapter analyzes the distinctive financial strategies of cooperatives, focusing on capital formation, surplus distribution, and investment decisions. Unlike investor-owned firms, cooperative capital is primarily member-subscribed and non-tradable, serving as a means to fulfill members’ collective needs rather than to maximize financial returns. Cooperative equity consists of member shares and reserves, especially indivisible reserves, which function as permanent common assets that enhance stability, protect cooperative identity, and promote intergenerational solidarity. The chapter explains multiple internal financing methods, including compulsory and voluntary member shares, retained patronage refunds, revolving capital, and “sweat equity.” Cooperatives also rely on internal debt such as member loans and sectoral solidarity funds. External financing is possible through preferred shares, bonds, or subsidiaries, but excessive reliance on external investors risks weakening member control and cooperative identity. Surplus distribution in cooperatives differs fundamentally from profit distribution in investor-owned firms. Surpluses are allocated to reserves, patronage refunds, and community or inter-cooperative development, rather than to unlimited dividends. These allocations shape member behavior, organizational stability, and long-term performance. Investment decisions in cooperatives prioritize improving member services and collective sustainability rather than maximizing returns. Member participation in governance helps reject poor investments but can slow decision-making. The chapter concludes that balanced use of individual member capital and collective reserves, supported by solidarity mechanisms, is essential for sustainable cooperative finance.