MML Series Investment Fund*

MML Aggressive Allocation Fund - Initial Class

MML Aggressive Allocation Fund - Service Class

Summary Prospectus
Prospectus
Statement of Additional Information
Annual Report
Semi-annual Report
Annual Financial Statements and Other Information
Semi-annual Financial Statements and Other Information
Portfolio Holdings Q1
Portfolio Holdings Q3

MML American Funds Core Allocation Fund - Service Class I

MML American Funds Growth Fund - Service Class I

MML Balanced Allocation Fund - Initial Class

MML Balanced Allocation Fund - Service Class

MML Blue Chip Growth Fund - Initial Class

MML Blue Chip Growth Fund - Service Class

MML Conservative Allocation Fund - Initial Class

MML Conservative Allocation Fund - Service Class

MML Equity Income Fund - Initial Class

MML Equity Income Fund - Service Class

MML Equity Index Fund - Class I

MML Equity Index Fund - Class II

MML Equity Index Fund - Class III

MML Equity Index Fund - Service Class I

MML Focused Equity Fund - Class II

MML Focused Equity Fund - Service Class I

MML Foreign Fund - Initial Class

MML Foreign Fund - Service Class

MML Fundamental Equity Fund - Class II

MML Fundamental Equity Fund - Service Class I

MML Global Fund - Class I

MML Global Fund - Class II

MML Global Fund - Service Class I

MML Growth Allocation Fund - Initial Class

MML Growth Allocation Fund - Service Class

MML Income & Growth Fund - Initial Class

MML Income & Growth Fund - Service Class

MML International Equity Fund - Class II

MML International Equity Fund - Service Class I

MML Large Cap Growth Fund - Initial Class

MML Large Cap Growth Fund - Service Class

MML Managed Volatility Fund - Initial Class

MML Managed Volatility Fund - Service Class

MML Mid Cap Growth Fund - Initial Class

MML Mid Cap Growth Fund - Service Class

MML Mid Cap Value Fund - Initial Class

MML Mid Cap Value Fund - Service Class

MML Moderate Allocation Fund - Initial Class

MML Moderate Allocation Fund - Service Class

MML Small Cap Growth Equity Fund - Initial Class

MML Small Cap Growth Equity Fund - Service Class

MML Small Company Value Fund - Class II

MML Small Company Value Fund - Service Class I

MML Small/Mid Cap Value Fund - Initial Class

MML Small/Mid Cap Value Fund - Service Class

MML Sustainable Equity Fund - Initial Class

MML Sustainable Equity Fund - Service Class

MML Total Return Bond Fund - Class II

MML Total Return Bond Fund - Service Class I