$1.92
$46.60
bear $1.92
base $26.93
bull $46.60
margin of safety $12.00
market price* $32.23
Business condition attached to the margin of safety
Full-year 2026 results must confirm that 2025's first year of positive owner earnings was not a one-off: owner earnings (operating cash flow after stock compensation, capital spending, commissions and lease costs) of at least about $45 million, with stock-based compensation below 11% of revenue and revenue growth of at least 8%.
WHAT THE BUSINESS IS Five9 sells cloud contact-center software: the system that routes, records and automates customer-service calls, chats and messages. At the end of 2025 it had more than 3,000 customers across many industries, with licenses ranging from small to very large. Customers pay recurring subscription and usage fees, largely per agent seat, and increasingly for its Genius AI products (AI Agents that handle calls on their own, Agent Assist, AI Summaries, Workflow Automation). Revenue was $1,149 million in 2025, up 10.3%, and about 89% of it came from customers with US billing addresses. Growth has slowed every year: 40% in 2021, 28% in 2022, 17% in 2023, 14% in 2024, 10% in 2025, and 10% again in the first half of 2026. Revenue kept from existing customers grew 5% in 2025, down from 8% in 2024. WHAT THE OWNERS HAVE ACTUALLY EARNED We measure the cash an owner could take out each year: operating cash flow, minus stock-based pay (a real cost paid in shares), minus the capital spending needed to keep the platform running, with sales commissions and office rent charged as they are expensed. On that basis Five9 earned roughly nothing or lost money for owners in every year from 2016 through 2024. The deepest hole was 2022, at about -$93 million (-$1.33 a share), when stock pay reached 22% of revenue. 2025 was the first clearly positive year: about $35 million, or $0.46 a share. That turn came mostly from lower stock pay, which fell from $206 million in 2023 to $148 million in 2025. It fell again to $66 million in the first half of 2026, from $81 million a year earlier. Five9 eliminated about 6% of positions in a 2024 restructuring and about 4% in a 2025 plan, and hired a new chief executive, Amit Mathradas, in December 2025. About $13 million of the 2025 figure was interest: roughly $22 million received on the cash pile, less $9.7 million paid on the notes. The operating business itself produced about $23 million. The years before 2025 describe a company built to grow at any cost, not the business as it runs today, so we start from the 2025 level rather than a longer average. We cross-checked it against the first half of 2026: operating income was $20.5 million, against a $7.0 million loss a year earlier. The level therefore rests on one full year plus two quarters, and that is the main weakness of this analysis. Accounting choices that matter: capital spending includes capitalized software ($39 million in 2025) and equipment paid for through finance leases. It is split into upkeep and growth using Five9's own ten-year ratio of spending to revenue. Sales commissions are charged at the amount expensed ($86 million in 2025), not the $120 million paid in cash; the gap is spending on new growth. DEBT, CASH AND SHARES Five9 owes $747.5 million of 1% convertible notes due March 2029, which convert at $79.42 a share. At June 30, 2026 it held $654 million of cash and investments, after spending $100 million on buybacks in the first half of 2026 and $50 million in late 2025. It repaid its previous notes in cash ($434 million in June 2025). Because the cash flows we count are already after interest, we do not subtract the debt from the value, and we do not add the cash either. Instead, each case states what happens to the notes in 2029 and charges the interest that follows. No case is worth more than $79.42 a share, so the notes are not assumed to convert, and the shares are valued on about 75.0 million shares (74.7 million outstanding in July 2026 plus employee awards). If they did convert, holders would be diluted by about 9.4 million shares. BASE CASE, ABOUT $27 A SHARE Revenue growth keeps slowing, from 9% in 2026 to 5% by 2034-35, in line with the steady slowdown already seen. Owner earnings from the operating business rise from about 2% of revenue in 2025 to about 4% in 2026 and then by about 1.2 points a year to 10% by 2031. The main driver is the stock-pay cut already under way: stock pay was 22.7% of revenue in 2023, 12.9% in 2025 and about 10.6% in the first half of 2026. The first-year step (total owner earnings of about $57 million in 2026, against $35 million in 2025) is well below the $78 million swing achieved in 2025, and it is backed by the dated first-half 2026 results. After 2035, earnings hold flat for ten years and then stop: platform shifts in this industry (on-premise to cloud, now to AI) mean we cannot defend any value beyond about 20 years. That cut-off is the limit of our evidence, not the end of the business, so in this case the notes are refinanced in 2029 rather than repaid out of earnings. Five9 has sold convertible notes three times (2018, 2020 at 0.5%, 2024 at 1%), so we assume it rolls them at a similar 1% coupon. The cash pile stays in place, and net interest stays at about $8 million a year of income, its first-half 2026 pace. BEAR CASE, ABOUT $2 A SHARE AI agents reduce the number of paid human-agent seats. Revenue kept from existing customers is already slipping (108% to 105%). Revenue growth falls to 5% in 2027 and 2% from 2030. The stock-pay cuts stall, and owner earnings from operations stay near 3% of revenue. Five9 keeps buying technology companies without adding matching earnings, as it has done repeatedly ($165 million of purchases in 2020 including Inference, Aceyus for $82 million in 2023, Acqueon for $167 million in 2024); we charge about $20 million a year for this. With earnings this thin, we assume Five9 cannot refinance cheaply in 2029. It uses about $500 million of the cash it already holds to retire most of the notes, keeps about $150 million as operating cash, and refinances the remaining $250 million or so at 7%, well above the 5.4% long-term Treasury yield. Net interest therefore swings from about $8 million of income to about $13 million of cost a year. That principal comes from cash already on hand, not from future earnings, so neither the cash nor the debt is otherwise counted. Earnings fade to zero over the five years after 2035, which again marks the limit of our evidence. In this case the shares are worth only about $2, because the business earns little more than it pays in interest and acquisition spending. BULL CASE, ABOUT $47 A SHARE The Genius AI products lift usage revenue instead of eating seats. Growth holds at 10% to 10.5% for three years before easing to 6% by 2035. Stock pay keeps falling toward 7% of revenue, and owner earnings from operations reach 14% of revenue by 2032. The recurring customer base then holds that level for 15 more years. As in the base case, the notes are refinanced in 2029 at about 1%, and the cash keeps earning interest. At about $47 a share the value is still well below the $79.42 conversion price, so no conversion dilution is counted. WHAT COULD MAKE THIS WRONG Almost the whole gap between the cases comes down to one question: does the margin keep expanding? The second quarter of 2026 is a warning sign. Operating income was only $2.0 million, against $18.5 million in the first quarter, even though revenue grew 10% from a year earlier. We could not find the cause of the weaker quarter in the filings we reviewed. The other open question is whether AI shrinks the seat count Five9 charges for faster than its AI products replace that revenue. The base and bull cases also assume Five9 can refinance its notes in 2029 at about the coupon it has paid before; if it instead had to refinance the way the bear case does, the base value would be about $2.50 a share lower. Values are discounted at 6% and do not depend on the share price.