Business Combination Prospectus (Form 425)

Filed by SunAmerica Series Trust (SEC File Nos.: 333-297804 and 033-52742; 811-07238)

pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed

filed pursuant to Rule 14a-6 under the Securities Exchange Act of 1934, as amended.

Subject Company: Guardian Variable Products Trust

Subject Company SEC File Numbers: 333-210205 and 811-23148

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