0002119573 2026-11-04 2026-11-04 true 0002119573 0002119573 2026-11-04 1 S-6 Guggenheim Defined Portfolios, Series 2640 Under normal circumstances, the trust will invest at least 80% of the value of its assets in common shares of closed-end investment companies (“<i>Closed-End Funds</i>”) and common shares of exchange-traded funds (“<i>ETFs</i>”) that invest substantially all of their assets in New York municipal bonds, the income from which is exempt from regular federal and New York state income taxes, which are rated investment-grade by a nationally recognized statistical rating organization.