Periodic/Interim Report by Investment Company (Form N-30B-2)

Annuity Investors Variable Account C, Registration Nos. 811-21095 and 333-88302

Sincerely,

John P. Gruber

Senior Vice President

AIM Variable Insurance Funds (Invesco Variable Insurance Funds)

Invesco V.I. American Value Fund-Series I Shares

Invesco V.I. Comstock Fund-Series I Shares

Invesco V.I. Core Equity Fund-Series I Shares

Invesco V.I. Discovery Large Cap Fund-Series II Shares

Invesco V.I. Discovery Mid Cap Growth Fund-Series II Shares

Invesco V.I. Diversified Dividend Fund-Series I Shares

Invesco V.I. Equity and Income Fund-Series II Shares

Invesco V.I. Global Fund-Series II Shares

Invesco V.I. Government Securities Fund-Series II Shares

Invesco V.I. Health Care Fund-Series I Shares

Invesco V.I. Main Street Fund^®-Series II Shares

Invesco V.I. Main Street Mid Cap Fund^®-Series II Shares

Invesco V.I. Main Street Small Cap Fund-Series II Shares

Invesco V.I. Small Cap Equity Fund-Series I Shares

ALPS Variable Investment Trust

Morningstar Balanced ETF Asset Allocation Portfolio-Class II Shares

Morningstar Conservative ETF Asset Allocation Portfolio-Class II Shares

Morningstar Growth ETF Asset Allocation Portfolio-Class II Shares

Morningstar Income and Growth ETF Asset Allocation Portfolio-Class II Shares

BNY Mellon Investment Portfolios

Mid Cap Stock Portfolio - Service Shares

Technology Growth Portfolio-Initial Shares

BNY Mellon Stock Index Fund, Inc.-Service Shares

The BNY Mellon Sustainable U.S. Equity Portfolio, Inc.-Service Shares

BNY Mellon Variable Investment Fund

Appreciation Portfolio-Service Shares

Government Money Market Portfolio

Calamos Advisors Trust

Calamos Growth and Income Portfolio (closed)

Davis Variable Account Fund, Inc.

Davis Equity Portfolio (closed)

Franklin Templeton Variable Insurance Products Trust

Templeton Foreign VIP Fund-Class 2 Shares

Janus Aspen Series

Janus Henderson VIT Balanced Portfolio-Service Shares

Janus Henderson VIT Enterprise Portfolio-Service Shares

Janus Henderson VIT Global Research Portfolio-Service Shares (closed)

Janus Henderson VIT Overseas Portfolio-Service Shares

Janus Henderson VIT Research Portfolio-Service Shares

Lincoln Variable Insurance Products Trust

LVIP American Century Capital Appreciation Fund-Standard Class II

LVIP American Century Large Company Value Fund-Service Class

LVIP American Century Mid Cap Value Fund-Service Class

Morgan Stanley Variable Insurance Fund, Inc.

Discovery Portfolio-Class I Shares

Neuberger Berman Advisers Management Trust

Mid Cap Growth Portfolio-Class S Shares

Quality Equity Portfolio-Class S Shares

PIMCO Variable Insurance Trust

PIMCO High Yield Portfolio-Administrative Class

PIMCO Real Return Portfolio-Administrative Class

PIMCO Total Return Portfolio-Administrative Class

Wilshire Variable Insurance Trust

Wilshire Global Allocation Fund