M&T BANK CORP

M&T consistently provides supplemental reporting of its results on a “net operating” or “tangible” basis, from which M&T excludes the after-tax effect of amortization of core deposit and other intangible assets (and the related goodwill, core deposit intangible and other intangible asset balances, net of applicable deferred tax amounts) and gains (when realized) and expenses (when incurred) associated with merging acquired operations into the Company, since such items are considered by management to be “nonoperating” in nature. Although “net operating income” as defined by M&T is not a GAAP measure, M&T’s management believes that this information helps investors understand the effect of acquisition activity in reported results.

SUPPLEMENTAL REPORTING OF NON-GAAP RESULTS OF OPERATIONS

(a)At the period end.

The efficiency ratio measures the relationship of noninterest operating expenses, which exclude expenses M&T considers to be "nonoperating" in nature consisting of amortization of core deposit and other intangible assets and merger-related expenses, to revenues. The calculations of the Company’s efficiency ratio, or noninterest operating expenses divided by the sum of taxable-equivalent net interest income and noninterest income (exclusive of gains and losses from bank investment securities), and reconciliations of GAAP amounts with corresponding non-GAAP amounts are presented in Table 2.

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