We plan to continue to opportunistically monetize our public issues as market conditions improve. As previously discussed, we continue to focus on our shareholder friendly initiatives. To that end, on August 7, our Board of Directors authorized an additional $5 million for share repurchases and an extension of the share repurchase program through October 31, 2024. Given the significant discount in which our stock is trading compared to net asset value, we determined the current continuation of the share repurchase program to be an efficient and accretive deployment for capital. As public and private market volatility persists, we remain patient and selective as we evaluate new opportunities. We believe our considerable investable capital affords us an opportunity to continue to add high-quality companies to our portfolio.
Thank you for your attention and with that I will hand it over to Allison Green, our Chief Financial Officer.
Allison Green: Thank you, Mark. I would like to follow Mark’s update with a more detailed review of our portfolio activities since the start of the third quarter, details on the share of purchase program, followed by our financial results as of September 30, 2023, and finally, our liquidity positions. First, I’d like to provide a more detailed update on our investment portfolio activity for the third quarter and subsequent to quarter end. This does not include investments in short-term US Treasuries. During the third quarter, we invested a total of $7.3 million in new and follow-on investments. These include a $0.8 million investment in four types of common shares via a secondary transaction, a $1 million investment spent through SuRo Capital Sports and Profit Exchange’s simple agreement for future equity or states.
And a $500,000 fall on investment in Series B4 preferred shares for which we also received awards. Over the course of the third quarter, we continued to monetize our Nextdoor public shares. We sold 589,996 public common shares Nextdoor for approximately $1.8 million of net proceeds, resulting in a net realized loss of approximately $1.4 million. In addition to sales of our unrestricted publicly traded investments, we received approximately $266,000 in proceeds from Second Avenue related to principal repayment and interest on the 15% term loan due December 2023, as well as other investment dividend and interest income. At the quarter end, we made a $325,000 follow-on investment through SuRo Capital Sports and X-Point Convertible Notes. Subsequent to quarter end as well, through yesterday we sold $57,931 PSQ Holdings Inc warrants for approximately $68,000 of net proceeds, resulting in a net realized gain of approximately $39,000.
Finally, in subsequent quarter end, we received approximately $86,000 in net proceeds from Second Avenue related to principal repayment and interest on the 15% term loan due December 2023, as well as other interest dividends and interest income. Please turn to Slide 7. Segmented by six general investment themes, the top allocation of our investment portfolio at quarter end was to education technology, representing approximately 40% of the investment portfolio at fair value. Marketplaces was the second largest category, representing approximately 22% of the portfolio. The financial technology category accounted for approximately 18% of our investment portfolio, and Approximately 15% of our portfolio was invested in cloud and big data companies.
Social and mobile accounted for approximately 4% of the fair value of our portfolio and sustainability accounted for less than 1% of the fair value of our portfolio as of September 30. Please turn to slide eight. As Mark mentioned, on August 7, our Board of Directors authorized a $5 million expansion to the share repurchase program to $60 million and an extension of the share repurchase program through October 31, 2024. During the quarter ended September 30, 2023, under the share repurchase program, the company repurchased 186,93 shares of its common stock for approximately $680,000 subject to regulatory restrictions. Year-to-date, under both the share repurchase program and our modified Dutch auction tender offer, we have repurchased 3.2 million shares for approximately $14.2 million and have a remaining $20.7 million approved to deploy via the share repurchase program.
Since the inception of the share repurchase program in August 2017, we have repurchased a total of 6,018,501 shares of our common stock for a total deployment of approximately $39.3 million of the $60 million authorized by the Board. This does not include repurchases under various tender offers during the time period. About $20.7 million remains authorized under the share repurchase program and is currently set to expire on October 31, 2024. I Under the share repurchase program, SuRo Capital may repurchase its outstanding common stock in the open market, provided to comprise with prohibitions under its insider trading policies and procedures and the applicable regulation. Please turn to slide nine. We recognize that our NAV per share is an important input to our shareholders.
