${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_u\text{s}\text{e}\text{s}\text{q}\text{u}\text{a}\text{n}\text{t}\text{i}\text{t}\text{a}\text{t}\text{i}\text{v}\text{e}\text{t}\text{e}\text{c}\text{h}\text{n}\text{i}\text{q}\text{u}\text{e}\text{s}\text{,}\text{a}\text{n}\text{d}\text{o}\text{f}\text{t}\text{e}\text{n}\text{a}\text{u}\text{t}\text{o}\text{m}\text{a}\text{t}\text{e}\text{d}\text{t}\text{r}\text{a}\text{d}\text{i}\text{n}\text{g}\text{s}\text{y}\text{s}\text{t}\text{e}\text{m}\text{s}\text{,}to\text{s}\text{e}\text{e}\text{k}\text{o}\text{u}\text{t}\text{m}\text{a}\text{n}\text{y}\text{t}\text{e}\text{m}\text{p}\text{o}\text{r}\text{a}\text{r}\text{y}\text{m}\text{i}\text{s}\text{a}\text{l}\text{i}\text{g}\text{n}\text{m}\text{e}\text{n}\text{t}\text{s}\text{a}\text{m}\text{o}\text{n}\text{g}securities.}$

${?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}$ uses quantitative techniques, and often automated trading systems, $to$ seek out many temporary misalignments among $securities.$

Covered interest arbitrage

Locational arbitrage

Triangular arbitrage

Statistical arbitrage

All arbitrage