First Quarter 2017 Financial Review

Securities Portfolio Stable Average portfolio yield increased 1 basis point Securities Portfolio ($ in billions) Treasury Securities & Other Mortgage-backed Securities (MBS) -Securities Yields 12.4 12.3 12.4 12.3 12.2 12.4 12.3 Duration of 3.5 years¹ 9.4 9.3 9.4 9.4 9.3 9.5 9.4 2.05 2.03 2.01 2.01 2.02 1Q16 2Q16 3Q16 4Q16 Average Balances 1Q17 4Q16 1Q17 Period-end ■ Extends to 4.0 years under a 200 bps instantaneous rate increase1 Net unrealized pre-tax loss of $43MM² Net unamortized premium of $26MM³ GNMA-51% of MBS portfolio 3/31/17 Estimated as of 3/31/17. Excludes auction rate securities (ARS). • 2Net unrealized pre-tax gain on the available-for-sale (AFS) Comerica Bank portfolio Net unamortized premium on the MBS portfolio Net Interest Income Increased $15MM NIM increased 21 basis points with benefit from rising rates Net Interest Income ($ in millions) --NIM $455MM 4Q16 470 +9MM Loan impacts 455 450 + $23MM increase in rates 447 445 + $2MM 4Q16 lease residual value adjustment 2.65% +0.17 $8MM 2 less days $ 8MM lower balances + 3MM Fed balance impact +0.03 + $4MM increase in rates - $ 1MM lower balances + 2MM Lower wholesale funding cost +0.01 2.86 +$5MM lower balances 2.81 2.74 $3MM increase in rates 2.66 2.65 +1MM Lower deposit costs $470MM 1Q17 2.86% 1Q16 1Q17 compared to 4Q16 2Q16 3Q16 4Q16 1Q17 Ⓡ 7 Comerica Bank Ⓡ 8

View entire presentation