Portfolio and Investment Activities
As of December 31, 2018, the fair value of our investment portfolio totaled $643.0 million and consisted of 60 active portfolio companies and three portfolio companies that have sold their underlying operations. Our total portfolio investments at fair value were approximately 107.4% of the related cost basis as of December 31, 2018. As of December 31, 2018, seven debt investments bore interest at a variable rate, which represented $75.9 million of our portfolio on a fair value basis, and the remainder of our debt portfolio was comprised of fixed rate investments. As of December 31, 2018, our average active portfolio company investment at amortized cost was $10.0 million, which excludes investments in the three portfolio companies that have sold their underlying operations. The weighted average yield on debt investments was 12.6% as of December 31, 2018. The weighted average yield was computed using the effective interest rates for debt investments at cost as of December 31, 2018, including the accretion of OID and loan origination fees, but excluding investments onnon-accrual status, if any.
Fourth quarter 2018 investment activity included the following new portfolio company investments:
| • | | Alzheimer’s Research and Treatment Center, LLC, a leading clinical trial site services provider with a focus on trials targeting the treatment and prevention of Alzheimer’s Disease. Fidus invested $7.5 million in first lien debt and common equity. |
| • | | Palisade Company, LLC, a leading provider of risk modeling and decision analysis software. Fidus invested $7.5 million in subordinated debt and common equity. |
| • | | Argo Turboserve Corporation, a leading provider of parts management and other outsourced logistics services to the aerospace and industrial markets. Fidus invested $15.0 million in second lien debt. |
As of December 31, 2018, we had debt investments in two portfolio companies onnon-accrual status, which had an aggregate cost and fair value of $29.6 million and $20.8 million, respectively.
Liquidity and Capital Resources
As of December 31, 2018, we had $42.0 million in cash and cash equivalents and $53.5 million of unused capacity under our senior secured revolving credit facility (the “Credit Facility”). As of December 31, 2018, we had SBA debentures outstanding of $191.0 million, $50.0 million outstanding of our 5.875% notes due 2023 (the “Public Notes”), and $36.5 million outstanding under our Credit Facility. As of December 31, 2018, the weighted average interest rate on total debt outstanding was 4.1%.
Subsequent Events
On January 3, 2019, we invested $17.0 million in subordinated debt, common equity and preferred equity, and made a commitment for up to $11.0 million of additional subordinated debt, of BCM One Group Holdings, Inc., a provider of managed technology solutions and services.
On January 3, 2019, we exited our debt investments in Gurobi Optimization, LLC. We received payment in full of $20.4 million on our subordinated debt, which includes a prepayment penalty.
On January 28, 2019, we exited our existing debt and equity investments in K2 Industrial Services, Inc. We received payment in full on our Tranche A andA-1 notes, including prepayment penalties, and recognized a loss of approximately $1.3 million on our equity investment. We converted our remaining Tranche B note into a new debt security of K2 Merger Agreement Agent, LLC (the residual escrow entity).
On January 28, 2019, we invested $18.4 million in subordinated debt and common equity of BCC Group Holdings, Inc., a leading provider of software and data solutions designed to enhance direct mail processing.
On February 1, 2019, we exited our debt investment in Fiber Materials, Inc. We received payment in full of $4.0 million on our second lien debt.
On February 1, 2019, we exited our debt investment in Tile Redi, LLC. We received payment in full of $10.2 million on our first lien debt.
On February 7, 2019, we invested $10.5 million in first lien debt and common equity of Diversified Search, LLC, a leading multi-practice retained executive search firm.