pay the costs of settlement and damage awards against directors and executive officers as required by these indemnification provisions. At present, there is no pending litigation or proceeding involving a director or officer of ours regarding which indemnification is sought, nor is the registrant aware of any threatened litigation that may result in claims for indemnification.
We maintain insurance policies that indemnify our directors and officers against various liabilities arising under the Securities Act and the Exchange Act that might be incurred by any director or officer in his or her capacity as such.
Certain of our non-employee directors may, through their relationships with their employers, be insured and/or indemnified against certain liabilities incurred in their capacity as members of our board of directors.
Item 15. Recent Sales of Unregistered Securities.
During the past three years, we issued the following securities which that were not registered under the Securities Act:
Preferred Stock Issuances. Between December 2016 and February 2019, we issued an aggregate of 3,723,110 shares of our Series E redeemable preferred stock at a purchase price of $21.7560 per share, for an aggregate purchase price of $81.0 million.
Between March 2019 and January 2020, we issued an aggregate of 6,039,272 shares of our Series F redeemable preferred stock at a purchase price of $22.3537 per share, for an aggregate purchase price of $135.0 million.
Between April 2020 and May 2021, we issued an aggregate of 5,506,564 shares of our Series G redeemable preferred stock at a purchase price of $14.74096 per share, for an aggregate purchase price of $81.2 million.
Plan-Related Issuances. Since June 30, 2018, we granted to certain directors, officers, employees, consultants, and other service providers options to purchase an aggregate of 7,730,369 shares of our common stock under our 2009 Plan and 2019 Plan at exercise prices ranging from $6.76 to $14.51 per share, including the 20,000 Designer Collective Grants.
Since June 30, 2018, we granted to certain directors, officers, employees, consultants, and other service providers restricted stock units covering an aggregate of 2,431,768 shares of our common stock under our 2009 Plan and our 2019 Plan.
Warrant Issuances. Since June 30, 2018, we issued warrants to purchase up to an aggregate of 1,692,529 shares of our common stock to accredited investors at an exercise price of $0.01 per share.
Since June 30, 2018, we issued one warrant to purchase up to an aggregate of 76,627 shares of our Series G redeemable preferred stock at an exercise price of $14.7410 per share.
Since June 30, 2018, we issued 17,296 shares of our Series B redeemable preferred stock upon the exercise of warrants to purchase shares of our Series B redeemable preferred stock to an accredited investor at an exercise price of $7.9453 per share.
Since June 30, 2018, we issued 76,627 shares of our Series G redeemable preferred stock upon the exercise of warrants to purchase shares of our Series G redeemable preferred stock to an accredited investor at an exercise price of $14.7410 per share.
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