Go to Bloomberg (available in the Business Library). Type company ticker hit EQUITY, type BETA.
Go to WRDS (personal registration required. Open only to faculty, PhDs, Master's students and staff). Click on CRSP and select Indices and Deciles. Select Portfolio Assignments.
Step One: Choose a Year-end Beta Assignment
Step Two: Choose a Date Range
Step Three: Enter a Ticker Symbol
Step Four: Choose Beta value (BETAV) and DATE
Submit your request
For Canadian companies on the Toronto Stock Exchange, use CFMRC.