GLADSTONE CAPITAL CORP (GLAD) stock intrinsic value fair value estimate & owner earnings analysis

Gladstone Capital is an externally managed business development company that has lent to lower middle-market U.S. businesses since 2001. At June 30, 2026 it held a $953 million portfolio at fair value, mostly first- and second-lien loans plus some equity stakes, funded by $486 million of common equity (net asset value $21.50 per share on 22.59 million shares), $177.5 million drawn on its credit facility, the $50 million 3.75% notes due May 1, 2027, the $149.5 million 5.875% convertible notes due October 1, 2030, and about $50 million of 6.25% Series A preferred stock. It must pay out nearly all taxable income, so the measure of earning power we use is net investment income: interest, dividends and fees on the portfolio, less interest paid to lenders, the adviser's management and incentive fees, and overhead. Reported operating cash flow is not used, because for a lender it is dominated by making and collecting loans, which is the business itself. Earnings record and starting point. Net investment income per share ran $1.58 to $1.70 from fiscal 2016 to 2021, when short-term rates were very low, rose to $2.20 in fiscal 2023 at the rate peak, then $2.11 in fiscal 2024 and $2.02 in fiscal 2025 (years end September 30). The anchor is $2.02, the median of fiscal 2021-2025, a window running from near-zero rates through the peak and into cuts on today's larger, mostly floating-rate portfolio. Fiscal 2025 income per share fell 4.3%. The first nine months of fiscal 2026 earned $1.51 a share against $1.50 a year earlier, so the decline has stopped for now; the June quarter earned $0.49. Our base case's first year is about $1.93 a share, a 4% to 5% decline from the roughly $2.00 the current year is tracking, no better than last year's actual rate of decline. The main reasons are that the adviser's voluntary fee credits have shrunk from $8.0 million in fiscal 2025 to $3.6 million in the first nine months of fiscal 2026, and the 3.75% notes due in May 2027 will have to be replaced at roughly the credit facility's rate of SOFR plus 2.60%, which costs about $1.2 million a year. During fiscal 2026 the company redeemed its 7.75% 2028 notes and 5.125% 2026 notes and replaced them with the convertible notes and bank borrowings. How lenders and preferred holders are handled. For a lender, borrowing is raw material and interest is an operating cost. Net investment income is already after all interest, so borrowings are not subtracted again. We value the income left for common shareholders after the preferred dividend (about $2.9 million a year at the current run rate), so the preferred claim is charged as it is paid. The convertible notes can turn into about 5.77 million shares at roughly $25.90 a share; where a case's value is above that price we assume conversion, add back the notes' $8.8 million of annual interest, and spread value over 28.36 million shares. Base case ($28.60): Income available to common runs about $40.6 million in year one and about $39.9 million a year thereafter (roughly $1.89 of net investment income per share before conversion), reflecting the 2027 note refinancing and the fee credits kept at today's reduced level. That holds through the forecast and beyond on the evidence of the record: the company earned $1.58-$2.20 a share every year for ten years through near-zero and 5% rates and the 2020 shutdown, and has operated for 24 years. No rate forecast, no growth from new capital, and no net credit gains or losses are assumed. The equity is worth about $665 million, or $29.43 on today's shares; because that is above the conversion price, conversion is assumed, giving $811 million over 28.36 million shares, or $28.60. Bear case ($16.79): One full credit cycle of the kind lower middle-market lenders went through in 2008-2010, together with lower rates. Short-term rates fall about 1.5 percentage points; the company's own disclosure shows a 1-point drop cuts annual interest income by about $6.9 million before incentive-fee offsets. Over two years, loans equal to roughly a tenth of the portfolio stop paying, and realized and unrealized losses take net asset value down about 15%, similar to this company's own slide from $18.12 a share in 2015 to $14.80 in 2020. The credit facility margin steps up from 2.60% to 3.10% after October 31, 2027. Income available to common falls from about $37 million in year one to about $24 million, $22 million and $20 million in years two to four, then recovers only partly to about $21.9 million, or about $1.10 of net investment income per share, because the lost capital does not come back. Investment income still covers interest throughout, and asset coverage stays above the 150% legal minimum, so no forced dilution is modeled, though it would be tight. The equity is worth about $379 million, or $16.79 a share. At that value conversion makes no sense, so the convertible notes remain debt. This is below the $21.50 net asset value, as a credit-cycle case for a lender should be. The company does not appear to owe more than it is worth in any case. Our previous bear figure was built on a milder credit assumption and is not comparable. Bull case ($32.51): The three loans on non-accrual since at least September 2024 (B+T Group, Edge Adhesives, WB Xcel; $28.8 million cost, about $13 million fair value) resume paying, lifting income to about $42.0 million in year one and $42.7 million in year two. After that, income grows about 1.5% a year, the pace that retained gains on the equity stakes that come with its lending have historically added to capital, reaching about $48.0 million in year ten. Nothing is credited for rate increases or market growth. The equity is worth about $776 million, or $34.33 on today's shares; with conversion it is $922 million over 28.36 million shares, or $32.51. Margin of safety. We are fairly sure of the earnings level: ten years of audited results sit in a $1.58-$2.20 band, and the current year is tracking close to the anchor. Less certain are credit and the adviser's goodwill. The worst plausible outcome is a long credit downturn coinciding with near-zero rates; borrowings plus preferred stock are roughly equal to net assets, so losses hit common shareholders with about twice their weight, and the adviser's voluntary fee credits, worth $0.15-$0.36 a share a year recently, could stop. If those things go wrong together, the shares are worth roughly the bear case's $16.79. The business currently distributes about $1.80 a share a year ($1.35 in the first nine months of fiscal 2026). From $17.00, collecting that distribution for four years with the shares then at the base value, the base case implies about 22% a year, and the price is close to what the shares are worth even if the credit cycle arrives. That price is also about 21% below today's net asset value. The margin-of-safety price is $17.00 because it is the highest price at which the bear case roughly preserves capital while the base case still clears 20% a year. What could make this wrong: a deeper or longer credit cycle than 2008-2010 in lower middle-market lending; the adviser ending fee credits; or rates returning to near zero. On the other side, conversion of the 2030 notes caps the upside for common shareholders when the business does well.