Alfred Tobia
Analyst · Janney Montgomery Scott
Thank you, Clifford. This acquisition, which was our first transaction with Starboard Value, was announced on June 5, 2020. It involved Acacia acquiring 18 public and private life sciences companies from the former Woodford equity income fund for a total consideration of $282 million or GBP 224 million. As we have said, this was an opportunistic acquisition, and it was one that came to us as part of our process of identifying and evaluating another potential investment. The assets within this portfolio fell into 2 categories, 12 public positions, 6 positions in private entities. To date, we have sold out of our positions in 7 public entities recovering $181 million in value.
We have also sold 1 private entity for a consideration of approximately $6 million. In aggregate, this means we have recovered $187 million out of the $282 million initial investment, representing 2/3 of our upfront capital.
Under GAAP, we record the value of the public holdings at market value as of the end of the quarter. The remaining private assets are held at cost and would be modified in the event of an impairment. If there is an observed transaction or a similar event, we update the value of the holding. To date, only one of our private holdings has had observable transactions since we acquired the portfolio. We have been transferring the securities onto our balance sheet from the seller in a staged process.
As of September 30, 2020, 2 of the private assets had been -- I apologize, have been transferred to Acacia with 1 preempted for which we received the cash sale price. In the weeks following the end of the quarter, an additional 2 positions were transferred. As of September 30, 2020, our balance sheet reflected the following remaining positions, positions in 6 public entities, Arix Bioscience, a position valued on September 30 at $37 million; Sensyne Health, a position valued at $11.4 million. In the aggregate, these positions the public entities as of September 30, 2020 had a market value of $54.5 million. We also have positions in 5 private companies, representing an aggregate value at September 30 of $139 million. As a reminder, we carry these positions at cost, net of any impairment, updated only if there has been an observable transaction, such as a primary or secondary sale of shares.
We had previously disclosed that one of our private Holdings, Oxford Nanopore, completed a secondary transaction in the second quarter, and we are carrying the value at $108 million as of September 30. For the remaining positions, there have been thus far no observable events, meaning these holdings are still valued at cost, which was approximately $31 million as of September 30. So in summary, after initially investing $282 million, we have recovered $187 million and hold public positions worth $54.5 million and private positions worth approximately $139 million. We continue to work on realizing the additional value inherent in these holdings.
The largest of the private company investments is 6% stake in Oxford Nanopore Technologies, an exciting company with disruptive technology and genetic sequencing, applicable to a broad range of applications in both research and commercial markets.
As we mentioned in the second quarter conference call, Oxford Nanopore announced a significant new contract with the UK government to provide precise detection of COVID and other pathogens on a rapid basis. We also hold a 5% position in Immunocore, a clinical stage T cell receptor biotechnology company, that is working to develop and commercialize a new generation of transformative medicines to address unmet user needs in cancer, infection and autoimmune disease.
Immunocore has pivotal clinical trials currently underway for its lead program, a potential treatment for metastatic uveal melanoma, a rare form of eye cancer. The company also has a robust pipeline of programs, spanning a broad range of cancer indications as well as infectious and autoimmune diseases. We will soon transfer a 26% position in Viamet, a royalty business in which we are one of the largest shareholders.
Our IP business had a very strong quarter, generating more than $19 million in revenue and nearly $5 million in portfolio income. Recently, we purchased an option on a very significant new portfolio that we believe represents an extremely rare opportunity. The IP team has been hard at work with our 4 previously acquired portfolios, and we are on track to deliver the returns that we anticipated when we acquired these assets earlier this year and late last year.
Rich Rosenstein, our CFO, will now discuss our results in more detail. Rich?