some debt securities have deferred interest whereby some portion of the interest payment is added to the principal balance so that the interest is paid , together with the principal , at maturity . this form of deferred interest is often called pik interest . typically , our equity investments consist of common stock , preferred stock , limited liability company interests , or warrants to purchase the foregoing . often , these equity investments occur in connection with our original investment , recapitalizing a business , or refinancing existing debt . during the year ended september 30 , 2020 , we invested $ 131.2 million in six new portfolio companies and extended $ 18.8 million in investments to existing portfolio companies . in addition , during the year ended september 30 , 2020 , we exited eleven portfolio companies through early payoffs or a restructure . we received a total of $ 78.8 million in combined net proceeds and principal repayments from the aforementioned portfolio company exits as well as principal repayments by existing portfolio companies during the year ended september 30 , 2020. this activity resulted in a net decrease in our overall portfolio by five portfolio companies to 48 and a net increase of $ 66.2 million in our portfolio at cost since september 30 , 2019. from our initial public offering in august 2001 through september 30 , 2020 , we have made 553 different loans to , or investments in , 246 companies for a total of approximately $ 2.1 billion , before giving effect to principal repayments on investments and divestitures . during the year ended september 30 , 2020 , the following significant transactions occurred : proprietary investments in october 2019 , we invested $ 14.0 million in universal survey center , inc. through secured first lien debt . in december 2019 , we invested $ 24.0 million in café zupas through secured first lien debt . in january 2020 , we invested an additional $ 5.5 million in lignetics , inc. , an existing portfolio company , through a combination of secured second lien debt and preferred equity . in july 2020 , we sold $ 6.0 million of our debt investment in lignetics , inc. at par . in january 2020 , we sold our investment in the mochi ice cream company ( mochi ) , which resulted in a realized gain of approximately $ 2.5 million . in connection with the sale , we received net cash proceeds of approximately $ 9.7 million , including the repayment of our debt investment of $ 6.8 million at par . in january 2020 , we exited our investment in meridian rack & pinion , inc. ( meridian ) , with a fair value of $ 0 as of december 31 , 2019 and recorded a realized loss of $ 5.6 million . in february 2020 , we invested $ 19.0 million in american trailer rental group llc through a combination of secured second lien debt and common equity . 62 in march 2020 , our investments in xmedius america , inc. and xmedius solutions inc. paid off at par for combined net proceeds of $ 14.9 million . in may 2020 , we invested $ 30.0 million in magpul industries corp. through secured second lien debt . in may 2020 , we invested $ 23.5 million in als education , llc through secured first lien debt . in may 2020 , we sold our investment in travel sentry , inc. for net proceeds of $ 6.1 million , which resulted in a $ 0.1 million realized loss . in may 2020 , our debt investment in canopy safety brands , llc paid off at par for net proceeds of $ 3.8 million . in july 2020 , our investment in universal survey center , inc. paid off at par for net proceeds of $ 14.1 million . in conjunction with the payoff , we received a prepayment fee of $ 0.3 million . in august 2020 , we invested $ 20.7 million in aerospace engineering , llc through secured first lien debt . syndicated investments in october 2019 , we invested an additional $ 3.0 million in medical solutions holdings , inc. , an existing portfolio company , through secured second lien debt . in october 2019 , our investment in digicert holdings , inc. paid off at par for net proceeds of $ 2.4 million . in december 2019 , our investment in ldiscovery , llc paid off at par for net proceeds of $ 5.0 million . in december 2019 , our investment in united pf holdings , llc paid off at par for net proceeds of $ 3.1 million . in conjunction with the payoff , we received a prepayment fee of $ 0.1 million . in december 2019 , we recorded a net realized loss of $ 4.4 million related to our investment in new trident holdcorp , inc. ( new trident ) which filed for bankruptcy protection in february 2019. in june 2020 , our investment in discoverorg , llc paid off at par for net proceeds of $ 3.3 million . in conjunction with the payoff , we received a prepayment fee of $ 33 thousand . refer to note 15 subsequent events in the accompanying consolidated financial statements included elsewhere in this annual report for portfolio activity occurring subsequent to september 30 , 2020. capital raising we have been able to meet our capital needs through extensions of and increases to our line of credit under the credit facility and by accessing the capital markets in the form of public equity offerings of common stock and public debt offerings . story_separator_special_tag as of september 30 , 2018 , one portfolio company , fdf was on non-accrual status , with an aggregate debt cost basis of approximately $ 26.9 million , or 6.9 % of the cost basis of all debt investments in our portfolio . other income increased by 162.9 % during the year ended september 30 , 2019 , as compared to the prior year , primarily due to an increase in success fees and prepayment penalties received . for the year ended september 30 , 2019 , other income consisted primarily of $ 1.9 million in success fees recognized , $ 1.2 million in prepayment fees received , and $ 1.1 million in dividend income . for the year ended september 30 , 2018 , other income consisted primarily of $ 0.6 million in prepayment fees received , $ 0.5 million in dividend income , and $ 0.4 million in success fees recognized . as of september 30 , 2019 and 2018 , no single investment represented greater than 10 % of the total investment portfolio at fair value . expenses expenses , net of any non-contractual , unconditional and irrevocable credits to fees from the adviser , increased $ 3.0 million , or 13.2 % , for the year ended september 30 , 2019 as compared to the prior year period . this increase was primarily due to a $ 2.2 million increase in interest expense on borrowings . interest expense increased by 37.2 % during the year ended september 30 , 2019 , as compared to the prior year , primarily due to the issuance of $ 57.5 million aggregate principal amount of the 2023 notes in november 2018 and an increase in the effective interest rate on our credit facility . we incurred $ 3.2 million in interest expense related to the 2023 notes during the year ended september 30 , 2019 versus no such amounts in the prior year period . the weighted average balance outstanding on our credit facility decreased during the year ended september 30 , 2019 compared to the prior year period with the issuance of the 2023 notes . the weighted average balance outstanding during the year ended september 30 , 2019 , was $ 71.5 million , as compared to $ 114.7 million in the prior year , a decrease of 37.7 % . the effective interest rate on our credit facility , including unused commitment fees incurred but excluding the impact of deferred financing costs , was 6.8 % during the year ended september 30 , 2019 , compared to 5.1 % during the prior year . the increase in the effective interest rate was driven by an increase in libor as compared to the prior year period and an increase in unused commitment fees paid in the current year period , partially offset by a decrease in the marginal interest rate on our credit facility effective march 9 , 2018. the net base management fee earned by the adviser decreased by $ 0.3 million , or 5.6 % , during the year ended september 30 , 2019 , as compared to the prior year , resulting primarily from an increase in credits from the adviser year over year , which are driven mainly by origination fees on new deals closed during the year . 72 the net income-based incentive fee increased by $ 0.6 million , or 17.4 % , for the year ended september 30 , 2019 , as compared to the prior year , due to higher pre-incentive fee net investment income , partially offset by an increase in net assets , which drives the hurdle rate , over the prior year . our board of directors accepted a non-contractual , unconditional and irrevocable credit from the adviser of $ 1.5 million to reduce the income-based incentive fee to the extent net investment income did not cover 100.0 % of our distributions to common stockholders during the year ended september 30 , 2019. the credit granted during the year ended september 30 , 2018 , totaled $ 1.7 million . the base management , loan servicing and incentive fees , and associated non-contractual , unconditional and irrevocable credits , are computed quarterly , as described under transactions with the adviser in note 4 related party transactions of the accompanying notes to consolidated financial statements and are summarized in the following table : replace_table_token_18_th ( a ) average total assets subject to the base management fee is defined as total assets , including investments made with proceeds of borrowings , less any uninvested cash or cash equivalents resulting from borrowings , valued at the end of the two most recently completed quarters within the respective years and adjusted appropriately for any share issuances or repurchases during the period . ( b ) reflected , on a gross basis , as a line item on our accompanying consolidated statement of operations located elsewhere in this annual report . realized loss and unrealized appreciation net realized loss on investments for the year ended september 30 , 2019 , we recorded a net realized loss on investments of $ 16.4 million , which resulted primarily from the restructuring of our investment in fdf in december 2018 and the associated recognition of a $ 26.9 million net realized loss , partially offset by the sale of our investment in adc in august 2019 for an $ 8.7 million realized gain . for the year ended september 30 , 2018 , we recorded a net realized loss on investments of $ 26.1 million , which resulted primarily from the restructure of our investment in sunshine media holdings ( sunshine ) , previously 73 on non-accrual status , and the associated recognition of a $ 28.2 million realized loss . this was partially offset by a $ 0.7 million realized gain from the sale of a portion of our equity investment in funko acquisition holdings , llc and a $ 0.6 million realized

liquidity and capital resources operating activities our cash flows from operating activities are primarily generated from the interest payments on debt securities that we receive from our portfolio companies , as well as net proceeds received through repayments or sales of our investments . we utilize this cash primarily to fund new investments , make interest payments on our credit facility , make distributions to our stockholders , pay management and administrative fees to the adviser and administrator , and for other operating expenses . net cash used in operating activities for the year ended september 30 , 2020 was $ 46.1 million as compared to net cash provided by operating activities of $ 9.3 million for the year ended september 30 , 2019. the change was primarily due to a decrease in principal repayments and net proceeds from sales of investments . repayments and net proceeds from sales were $ 78.8 million during the year ended september 30 , 2020 compared to $ 131.1 million during the year ended september 30 , 2019. net cash provided by operating activities for the year ended september 30 , 2019 was $ 9.3 million as compared to net cash used in operating activities of $ 17.8 million for the year ended september 30 , 2018. the change was primarily due to an increase in principal repayments and net proceeds from sales of investments partially offset by an increase in purchases of investments year over year . repayments and net proceeds from sales were $ 131.1 million during the year ended september 30 , 2019 compared to $ 67.9 million during the year ended september 30 , 2018. purchases of investments were $ 147.1 million during the year ended september 30 , 2019 , compared to $ 106.6 million during the year ended september 30 , 2018. as of september 30 , 2020 , we had loans to , syndicated participations in or equity investments in 48 companies , with an aggregate cost basis of approximately $ 494.6 million .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```liquidity and capital resources operating activities our cash flows from operating activities are primarily generated from the interest payments on debt securities that we receive from our portfolio companies , as well as net proceeds received through repayments or sales of our investments . we utilize this cash primarily to fund new investments , make interest payments on our credit facility , make distributions to our stockholders , pay management and administrative fees to the adviser and administrator , and for other operating expenses . net cash used in operating activities for the year ended september 30 , 2020 was $ 46.1 million as compared to net cash provided by operating activities of $ 9.3 million for the year ended september 30 , 2019. the change was primarily due to a decrease in principal repayments and net proceeds from sales of investments . repayments and net proceeds from sales were $ 78.8 million during the year ended september 30 , 2020 compared to $ 131.1 million during the year ended september 30 , 2019. net cash provided by operating activities for the year ended september 30 , 2019 was $ 9.3 million as compared to net cash used in operating activities of $ 17.8 million for the year ended september 30 , 2018. the change was primarily due to an increase in principal repayments and net proceeds from sales of investments partially offset by an increase in purchases of investments year over year . repayments and net proceeds from sales were $ 131.1 million during the year ended september 30 , 2019 compared to $ 67.9 million during the year ended september 30 , 2018. purchases of investments were $ 147.1 million during the year ended september 30 , 2019 , compared to $ 106.6 million during the year ended september 30 , 2018. as of september 30 , 2020 , we had loans to , syndicated participations in or equity investments in 48 companies , with an aggregate cost basis of approximately $ 494.6 million .
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 Suspicious Activity Report : some debt securities have deferred interest whereby some portion of the interest payment is added to the principal balance so that the interest is paid , together with the principal , at maturity . this form of deferred interest is often called pik interest . typically , our equity investments consist of common stock , preferred stock , limited liability company interests , or warrants to purchase the foregoing . often , these equity investments occur in connection with our original investment , recapitalizing a business , or refinancing existing debt . during the year ended september 30 , 2020 , we invested $ 131.2 million in six new portfolio companies and extended $ 18.8 million in investments to existing portfolio companies . in addition , during the year ended september 30 , 2020 , we exited eleven portfolio companies through early payoffs or a restructure . we received a total of $ 78.8 million in combined net proceeds and principal repayments from the aforementioned portfolio company exits as well as principal repayments by existing portfolio companies during the year ended september 30 , 2020. this activity resulted in a net decrease in our overall portfolio by five portfolio companies to 48 and a net increase of $ 66.2 million in our portfolio at cost since september 30 , 2019. from our initial public offering in august 2001 through september 30 , 2020 , we have made 553 different loans to , or investments in , 246 companies for a total of approximately $ 2.1 billion , before giving effect to principal repayments on investments and divestitures . during the year ended september 30 , 2020 , the following significant transactions occurred : proprietary investments in october 2019 , we invested $ 14.0 million in universal survey center , inc. through secured first lien debt . in december 2019 , we invested $ 24.0 million in café zupas through secured first lien debt . in january 2020 , we invested an additional $ 5.5 million in lignetics , inc. , an existing portfolio company , through a combination of secured second lien debt and preferred equity . in july 2020 , we sold $ 6.0 million of our debt investment in lignetics , inc. at par . in january 2020 , we sold our investment in the mochi ice cream company ( mochi ) , which resulted in a realized gain of approximately $ 2.5 million . in connection with the sale , we received net cash proceeds of approximately $ 9.7 million , including the repayment of our debt investment of $ 6.8 million at par . in january 2020 , we exited our investment in meridian rack & pinion , inc. ( meridian ) , with a fair value of $ 0 as of december 31 , 2019 and recorded a realized loss of $ 5.6 million . in february 2020 , we invested $ 19.0 million in american trailer rental group llc through a combination of secured second lien debt and common equity . 62 in march 2020 , our investments in xmedius america , inc. and xmedius solutions inc. paid off at par for combined net proceeds of $ 14.9 million . in may 2020 , we invested $ 30.0 million in magpul industries corp. through secured second lien debt . in may 2020 , we invested $ 23.5 million in als education , llc through secured first lien debt . in may 2020 , we sold our investment in travel sentry , inc. for net proceeds of $ 6.1 million , which resulted in a $ 0.1 million realized loss . in may 2020 , our debt investment in canopy safety brands , llc paid off at par for net proceeds of $ 3.8 million . in july 2020 , our investment in universal survey center , inc. paid off at par for net proceeds of $ 14.1 million . in conjunction with the payoff , we received a prepayment fee of $ 0.3 million . in august 2020 , we invested $ 20.7 million in aerospace engineering , llc through secured first lien debt . syndicated investments in october 2019 , we invested an additional $ 3.0 million in medical solutions holdings , inc. , an existing portfolio company , through secured second lien debt . in october 2019 , our investment in digicert holdings , inc. paid off at par for net proceeds of $ 2.4 million . in december 2019 , our investment in ldiscovery , llc paid off at par for net proceeds of $ 5.0 million . in december 2019 , our investment in united pf holdings , llc paid off at par for net proceeds of $ 3.1 million . in conjunction with the payoff , we received a prepayment fee of $ 0.1 million . in december 2019 , we recorded a net realized loss of $ 4.4 million related to our investment in new trident holdcorp , inc. ( new trident ) which filed for bankruptcy protection in february 2019. in june 2020 , our investment in discoverorg , llc paid off at par for net proceeds of $ 3.3 million . in conjunction with the payoff , we received a prepayment fee of $ 33 thousand . refer to note 15 subsequent events in the accompanying consolidated financial statements included elsewhere in this annual report for portfolio activity occurring subsequent to september 30 , 2020. capital raising we have been able to meet our capital needs through extensions of and increases to our line of credit under the credit facility and by accessing the capital markets in the form of public equity offerings of common stock and public debt offerings . story_separator_special_tag as of september 30 , 2018 , one portfolio company , fdf was on non-accrual status , with an aggregate debt cost basis of approximately $ 26.9 million , or 6.9 % of the cost basis of all debt investments in our portfolio . other income increased by 162.9 % during the year ended september 30 , 2019 , as compared to the prior year , primarily due to an increase in success fees and prepayment penalties received . for the year ended september 30 , 2019 , other income consisted primarily of $ 1.9 million in success fees recognized , $ 1.2 million in prepayment fees received , and $ 1.1 million in dividend income . for the year ended september 30 , 2018 , other income consisted primarily of $ 0.6 million in prepayment fees received , $ 0.5 million in dividend income , and $ 0.4 million in success fees recognized . as of september 30 , 2019 and 2018 , no single investment represented greater than 10 % of the total investment portfolio at fair value . expenses expenses , net of any non-contractual , unconditional and irrevocable credits to fees from the adviser , increased $ 3.0 million , or 13.2 % , for the year ended september 30 , 2019 as compared to the prior year period . this increase was primarily due to a $ 2.2 million increase in interest expense on borrowings . interest expense increased by 37.2 % during the year ended september 30 , 2019 , as compared to the prior year , primarily due to the issuance of $ 57.5 million aggregate principal amount of the 2023 notes in november 2018 and an increase in the effective interest rate on our credit facility . we incurred $ 3.2 million in interest expense related to the 2023 notes during the year ended september 30 , 2019 versus no such amounts in the prior year period . the weighted average balance outstanding on our credit facility decreased during the year ended september 30 , 2019 compared to the prior year period with the issuance of the 2023 notes . the weighted average balance outstanding during the year ended september 30 , 2019 , was $ 71.5 million , as compared to $ 114.7 million in the prior year , a decrease of 37.7 % . the effective interest rate on our credit facility , including unused commitment fees incurred but excluding the impact of deferred financing costs , was 6.8 % during the year ended september 30 , 2019 , compared to 5.1 % during the prior year . the increase in the effective interest rate was driven by an increase in libor as compared to the prior year period and an increase in unused commitment fees paid in the current year period , partially offset by a decrease in the marginal interest rate on our credit facility effective march 9 , 2018. the net base management fee earned by the adviser decreased by $ 0.3 million , or 5.6 % , during the year ended september 30 , 2019 , as compared to the prior year , resulting primarily from an increase in credits from the adviser year over year , which are driven mainly by origination fees on new deals closed during the year . 72 the net income-based incentive fee increased by $ 0.6 million , or 17.4 % , for the year ended september 30 , 2019 , as compared to the prior year , due to higher pre-incentive fee net investment income , partially offset by an increase in net assets , which drives the hurdle rate , over the prior year . our board of directors accepted a non-contractual , unconditional and irrevocable credit from the adviser of $ 1.5 million to reduce the income-based incentive fee to the extent net investment income did not cover 100.0 % of our distributions to common stockholders during the year ended september 30 , 2019. the credit granted during the year ended september 30 , 2018 , totaled $ 1.7 million . the base management , loan servicing and incentive fees , and associated non-contractual , unconditional and irrevocable credits , are computed quarterly , as described under transactions with the adviser in note 4 related party transactions of the accompanying notes to consolidated financial statements and are summarized in the following table : replace_table_token_18_th ( a ) average total assets subject to the base management fee is defined as total assets , including investments made with proceeds of borrowings , less any uninvested cash or cash equivalents resulting from borrowings , valued at the end of the two most recently completed quarters within the respective years and adjusted appropriately for any share issuances or repurchases during the period . ( b ) reflected , on a gross basis , as a line item on our accompanying consolidated statement of operations located elsewhere in this annual report . realized loss and unrealized appreciation net realized loss on investments for the year ended september 30 , 2019 , we recorded a net realized loss on investments of $ 16.4 million , which resulted primarily from the restructuring of our investment in fdf in december 2018 and the associated recognition of a $ 26.9 million net realized loss , partially offset by the sale of our investment in adc in august 2019 for an $ 8.7 million realized gain . for the year ended september 30 , 2018 , we recorded a net realized loss on investments of $ 26.1 million , which resulted primarily from the restructure of our investment in sunshine media holdings ( sunshine ) , previously 73 on non-accrual status , and the associated recognition of a $ 28.2 million realized loss . this was partially offset by a $ 0.7 million realized gain from the sale of a portion of our equity investment in funko acquisition holdings , llc and a $ 0.6 million realized

