KIRBY CORP (KEX) stock intrinsic value fair value estimate & owner earnings analysis

Kirby is the largest operator of inland tank barges in the United States. Its marine business (about 1,105 inland tank barges, roughly 28% of the estimated 4,004-barge U.S. fleet, plus 28 coastal barges) moves petrochemicals, refined products, black oil and agricultural chemicals along the Mississippi River System and the Gulf Intracoastal Waterway. That trade is reserved for U.S.-built, U.S.-crewed vessels under the Jones Act. Its second business, Kirby Distribution & Services, sells, services and manufactures engines, transmissions, power-generation and backup-power systems (increasingly for data centers), and oilfield equipment such as electric fracturing units. In 2025 roughly 70% of inland revenue was under term contracts of one to five years. Marine earned a 19.3% operating margin and Distribution & Services earned 9.2%. How we measured earnings. We start from cash from operations and remove working-capital swings, stock compensation and the capital spending needed to keep the fleet and facilities as they are. Kirby defers the cost of periodic vessel drydockings and amortizes it ($29.5 million in 2025). Because the cash for those drydockings sits in a working-capital line we strip out, we charge the amortization as a recurring cost. Leaving it out would overstate earnings by about $0.50 a share. Non-cash impairments ($561 million in 2020, $341 million in 2021, $56 million in 2024) are added back as sunk costs. Those write-downs of earlier coastal and oilfield purchases are a record of capital lost on acquisitions, and that record is reflected in the bear case. On this basis, owner earnings per share were $3.06 (2016), $4.24, $3.18, $3.16, $6.51, $2.75, $3.81, $1.95, $4.94 and $7.91 (2025). The 2020 figure is inflated by a one-time pandemic-era tax refund and deep capex cuts, so we exclude it. We value the business before its lenders by adding back interest paid, about $46 million a year. Normal earning power. This is a cyclical business. An oversupplied barge market and weak oilfield demand held earnings down from 2016 to 2021, and a tight barge market lifted them from 2023 to 2025. We measure the current fleet from 2019, after the Higman, Cenac and Savage fleet purchases. The median business cash flow for 2019 and 2021-2025 is about $259 million, or $4.82 a share on today's 53.7 million diluted shares. 2025 was far above that at about $490 million. Business cash flow grew 45% in 2025, and our base case assumes year one falls 12%, to $430 million. Recent results support starting above normal but not staying there: first-half 2026 net earnings of $171 million were flat with first-half 2025. Industry barge deliveries roughly matched retirements in 2025 (66 built, 65 retired), and only 60-70 new barges are on order for 2026. Base case ($67.43): earnings stay elevated for two to three years while today's term contracts run off ($430 million, then $360 million, then $300 million), then settle at about the $260 million mid-cycle level. That level carries on after year 10 because the Jones Act franchise, Kirby's scale and customer vetting standards are structural and maintenance spending is already charged. We credit no growth: Kirby grew mainly through large fleet and distributor acquisitions, which are individual bets rather than a small, repeatable process. Business worth about $4.62 billion, less about $1.0 billion of debt, leaves $3.62 billion. Bear case ($48.01): a repeat of the 2016-2021 pattern. Pricing fades as 2026's newbuilds arrive, rising mariner wages squeeze margins, and oilfield equipment revenue keeps falling as the market moves to electric fracturing (which the company already expects). Cash flow falls from $370 million to $175 million by year four, stays there for three years (below every year since 2016 except 2023), and recovers only to $210 million. Business worth about $3.58 billion, less $1.0 billion of debt, leaves $2.58 billion. Even at the trough, cash flow covers interest about 3.5 times. Bull case ($95.05): tight barge supply and an aging industry fleet (about 600 barges are 30 or more years old) keep pricing firm for longer, and power-generation orders for data centers keep growing. Cash flow stays near $500 million for two years and settles at $340 million, about the 2023-2025 average. Business worth about $6.10 billion, less debt, leaves $5.10 billion. Debt. At June 30, 2026, borrowings were $1.04 billion against $39 million of cash. They include $500 million of 4.2% notes due March 2028, about $300 million of 3.46%-3.51% notes due January 2033, a term loan due July 2027 and bank borrowings. The fixed coupons are below our 6% rate, which lowers the effective debt by about $50 million. We also deduct the outside partners' one-third share of the Osprey venture. Net debt is about $999 million, or $18.61 a share. The 2028 notes trade near par, and we see no refinancing strain. What could make this wrong. Capital spending reached 13% of revenue in 2023, against a 10-year average of 8.9%. If rising equipment costs make that level permanent, mid-cycle earnings would be lower than we assume. A pullback in Gulf Coast petrochemical output would also hit utilization quickly. Change from our prior estimate. Our earlier analysis put the base value near $40. It discounted riskier outcomes at higher rates and ended each case with an assumed perpetual growth rate. We now discount every case at the same 6% and express risk through the cases themselves, charge drydocking as a real cost, and assume no growth after year 10, only today's mid-cycle earning power continuing.