X0306 4 2021-07-16 0 0001846804 Big Sky Growth Partners, Inc. BSKY 0001846759 Big Sky Growth Partners, LLC C/O BIG SKY GROWTH PARTNERS, INC., 1201 WESTERN AVENUE, SUITE 406 SEATTLE WA 98101 0 0 1 0 Class B Common Stock 2021-07-16 4 D 0 1125000 D 7350000 D As described in the Issuer's Registration Statement on Form S-1, as amended (File No. 333-253569) (the "Registration Statement"), under the heading "Description of Securities," the Class B common stock will automatically convert into Class A common stock of the Issuer at the time of the Issuer's initial business combination and have no expiration date. The forfeiture of Class B common stock for no consideration is a result of the underwriters not exercising the over-allotment option in full. The number of shares being reported represents the current ownership of the reporting person and reflects the forfeiture of 1,125,000 shares of Class B common stock that was previously reported on the original Form 3. The forfeiture of the 1,125,000 Class B common stock occurred when the underwriters of the units offered in the Company's initial public offering did not exercise the over-allotment in full. /s/ Lauren Neiswender, as Attorney-in-Fact 2021-08-10