X0101 EFFECT 33 LIVE 2019-04-15 14:00:00

N-14

0000826732 CALAMOS INVESTMENT TRUST/IL 333-230277 0000826732 CALAMOS INVESTMENT TRUST/IL S000065224 Calamos Timpani Small Cap Growth Fund C000211096 Class I 0001014913 FRONTIER FUNDS, INC. S000022841 Frontier Timpani Small Cap Growth Fund C000066234 Institutional Class 0000826732 CALAMOS INVESTMENT TRUST/IL S000065224 Calamos Timpani Small Cap Growth Fund C000211096 Class I 0001014913 FRONTIER FUNDS, INC. S000022841 Frontier Timpani Small Cap Growth Fund C000167325 Service Class 0000826732 CALAMOS INVESTMENT TRUST/IL S000065224 Calamos Timpani Small Cap Growth Fund C000211098 Class A 0001014913 FRONTIER FUNDS, INC. S000022841 Frontier Timpani Small Cap Growth Fund C000066233 Class Y