Common Contracts

September 2, 2020 BCTG Acquisition Corp. 11682 El Camino Real, Suite 320 San Diego, CA 92130 Re: Initial Public Offering Ladies and Gentlemen:

Underwriting Agreement • September 9th, 2020 • BCTG Acquisition Corp. • Blank checks

• Contract Type
  Underwriting Agreement
• Filed
  September 9th, 2020
• Company
  BCTG Acquisition Corp.
• Industry
  Blank checks

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and among BCTG Acquisition Corp., a Delaware corporation (the “Company”) and SVB Leerink LLC, as representative (the “Representative”) of the several underwriters (each, an “Underwriter” and collectively, the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”), of 14,500,000 shares of the Company’s common stock (including up to 2,175,000 shares of common stock that may be purchased to cover over-allotments, if any) (the “Common Stock”). The Common Stock will be sold in the Public Offering pursuant to registration statements on Form S-1 and prospectus (the “Prospectus”) filed by the Company with the U.S. Securities and Exchange Commission (the “Commission”) and the Company has applied to have the shares of Common Stock listed on The Nasdaq Capital Market. Certain capitalized terms used herein

September [__], 2020 BCTG Acquisition Corp. 11682 El Camino Real, Suite 320 San Diego, CA 92130 Re: Initial Public Offering Ladies and Gentlemen:

Underwriting Agreement • August 31st, 2020 • BCTG Acquisition Corp. • Blank checks

• Contract Type
  Underwriting Agreement
• Filed
  August 31st, 2020
• Company
  BCTG Acquisition Corp.
• Industry
  Blank checks

This letter (this “Letter Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and among BCTG Acquisition Corp., a Delaware corporation (the “Company”) and SVB Leerink LLC, as representative (the “Representative”) of the several underwriters (each, an “Underwriter” and collectively, the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”), of 12,500,000 shares of the Company’s common stock (including up to 1,875,000 shares of common stock that may be purchased to cover over-allotments, if any) (the “Common Stock”). The Common Stock will be sold in the Public Offering pursuant to a registration statement on Form S-1 and prospectus (the “Prospectus”) filed by the Company with the U.S. Securities and Exchange Commission (the “Commission”) and the Company has applied to have the shares of Common Stock listed on The Nasdaq Capital Market. Certain capitalized terms used herei