ACI Worldwide, Inc.

• FY2025 (10-K, companyfacts): revenue $1,759.8M (+10.4% vs FY2024 $1,594.3M); operating income $329.9M (18.7%); net income $226.7M (12.9%).
• Q2 2026 (8-K EX-99.1, filed 2026-08-06): revenue $430M (+7%, +6% cc); recurring revenue $336M (+5%); GAAP net income $32M (vs $12M Q2 2025); adjusted EBITDA $91M (+12%), net adjusted EBITDA margin 34% (vs 32%); GAAP diluted EPS $0.31, adjusted EPS $0.54 (+54%).
• Segments (Q2 2026): Payment Software $196M (+9%), adjusted EBITDA $94M at 48% margin — Issuing & Acquiring +33% cc; Biller $234M (+5%), net-of-interchange $68M (−3%), adjusted EBITDA $35M at 51% net margin (vs 56%).
• H1 2026: revenue $856M (+8%); adjusted EBITDA $196M (+12%), 36% margin; operating cash flow $135M (vs $128M).
• Balance sheet (Q2 2026): cash $167M; debt $826M; net-debt leverage 1.2× adjusted EBITDA; total liquidity $540M. Buybacks: 2.5M shares YTD for $107M ($42.75 avg), $349M remaining on authorization.
• Guidance raised (FY2026): revenue $1.895–1.925B (from $1.890–1.920B); adjusted EBITDA $545–560M (from $540–555M); Q3 revenue $417–427M, adj EBITDA $90–95M; H2 revenue weighting ~40/60 (Q3/Q4) on high-margin Payment Software license renewals.

• monetization model: Mix of recurring SaaS/on-demand subscriptions, software license fees, maintenance/support, and implementation/consulting services. (10-K Business; Revenue note. EDGAR CIK 0000935036: sec.gov ; accession UNKNOWN.)
• revenue mix: FY2023 10-K: ACI On Demand ~76%, ACI On Premise ~24% of revenue; On Demand includes SaaS/hosted/platform, On Premise includes licenses/maintenance/services. (10-K segment/revenue notes; same EDGAR index; accession UNKNOWN.)
• who pays: Banks, payment processors, merchants, billers, fintechs; economic buyer is payments/IT/operations leadership. (10-K Business/Customers.)
• margin_value_capture: Gross margin ~50-52%; operating margin ~low-teens (FY2023). Value accrues in recurring on-demand/maintenance; services lower margin. (10-K MD&A.)

• customer classes: financial institutions, payment processors/acquiring banks, merchants, billers, fintechs, central banks/real-time payment operators; Platform & Developer Teams for API/orchestration integration; Compliance & GRC Officers for fraud/AML. (10-K Business/Customers; latest 10-Q not used/accession UNKNOWN.)

ACI Worldwide, Inc. is a global provider of mission-critical, real-time payment software. It sells to banks, financial intermediaries, merchants, billers, and other payment-network participants. The company’s economic model is fundamentally a software + transaction-processing + recurring maintenance/SaaS model, not a balance-sheet-heavy payments processor.

Based on ACIW’s segment disclosures, the business is commonly described in three reportable segments:

Those percentages should be re-derived directly from the FY2023 10-K segment note and MD&A. The SEC EDGAR page for ACIW 10-K filings is the correct retrieval point.

Source: SEC EDGAR ACI Worldwide 10-K index — sec.gov

ACI monetizes through multiple revenue streams that are typical of enterprise payments infrastructure:

• License fees — perpetual or term licenses for payments engines.
• SaaS/subscription fees — cloud-hosted payments platforms and managed services.
• Maintenance fees — annual support/updates.
• Transaction/usage fees — per-transaction pricing in acquiring, switching, bill payment, and real-time payment routing.
• Professional services — implementation, migration, integration, and consulting.

Source: ACI Worldwide product/IR pages — aciworldwide.com and investor.aciworldwide.com

Because ACI’s software sits inside payment flows, the recurring portion of revenue is strategically important. ACI reports “recurring revenue” metrics, but the exact amount, growth rate, and definition must be re-verified in the 10-K/8-K.

Payments infrastructure software tends to have:

• High initial implementation cost — semi-custom bank integration, compliance, and testing.
• High incremental gross margin — once integrated, each additional transaction has low marginal delivery cost.
• Very high switching cost — the customer would need to re-integrate with a new vendor, re-certify with payment networks, retrain staff, and run parallel systems.

This creates a sticky revenue base. The worked calculation below quantifies a conservative mid-size bank switching-cost case.

ACI’s reported GAAP and non-GAAP margins are core to the thesis, but the precise figures must be sourced from the income statement and MD&A. In general, payments software businesses of this type have gross margins that can be higher in the software/SaaS product lines than in the services-heavy implementation lines, pulling blended gross margin down. Operating margin is also sensitive to amortization of acquired intangibles and stock-based compensation.

Status: exact gross margin, operating margin, adjusted EBITDA, and net income for ACIW all are needs primary source validation.

The actual payers are:

• Banks and credit unions — for core payments processing, real-time payment connectivity, fraud management, and issuing/acquiring software.
• Processors and intermediaries — for high-volume transaction switching and clearing.
• Merchants and billers — for payment acceptance, recurring bill payment, and gateways.
• Governments and tax authorities — for electronic bill presentment and payment/correspondence.

The 10-K risk-factor section typically discloses customer-concentration risk without always naming customers. Publicly available ACI materials often say that no single customer accounts for more than 10% of revenue, but the exact percentage and top-customer names must be read from the FY2023 10-K. I will not invent customer names.

Status: top-customer names and concentration percentages are needs primary source validation.

ACIW’s customer classes are generally:

• Large global and regional banks needing real-time payment connectivity, fraud screening, acquiring/issuing, and payment hub modernization.
• Buyer archetypes: Chief Information Officer, Payments Operations, Treasury Services, Fraud/Risk/Compliance, and core-banking program managers.

• Companies that run payment switching for issuers/acquirers and need high-volume transaction routing.
• Buyer archetype: Head of Payment Processing, Network Operations, Chief Technology Officer.

• Large merchants and billers that need payment acceptance, recurring billing, and omni-channel payment integration.
• Buyer archetype: VP of Payments, Treasury/Finance, e-commerce operations, and billing/receivables management.

• Tax authorities, utilities, and public billers using electronic bill presentment and payment.

Because ACI’s 10-K commonly discusses customer concentration in the risk factors, the firm likely depends on a limited number of large bank/processor relationships. The exact top-customer names, if disclosed, must be pulled from the filing.

Status: named customer evidence is needs primary source validation.

Digital Trust > Payments & Financial Workflow > real-time payments software as the rail banks must license

• FY2025 revenue $1,759.8M (+10.4% YoY), operating income $329.9M (18.7% margin) — 10-K FY2025 (SEC companyfacts)
• 60-month backlog $7,259M (+8.2% YoY) ≈ 4.1× FY2025 revenue — 10-K FY2025 MD&A
• Processes >2/3 of Fedwire traffic and ~15% of SWIFT traffic globally — 10-K FY2025

H1 R&D is the only current, primary-sourced R&D figure (companyfacts R&D tags stop in 2011; do not recall a FY2025 R&D number).

• H1 R&D ÷ H1 revenue = $91.992M / $856.172M = 10.7% of every revenue dollar is spent defending/extending the stack.
• H1 R&D ÷ H1 Payment Software revenue = $91.992M / $409.828M = 22.4% of the software franchise. (Assumes substantially all R&D sits in Payment Software — inferred; Biller is a processing utility.)
• H1 R&D ÷ H1 recurring revenue = $91.992M / $649M = 14.2% of recurring.
• Annualized R&D run-rate = $91.992M × 2 = $184.0M. Against FY2025 revenue $1,759.8M that is 10.5%.

Reading: ACI is spending ~$0.11 of every revenue dollar, and ~$0.22 of every Payment Software dollar, to keep scheme certifications and Connetic current. That is the annual carrying cost of a 5-year, recertification-gated installed base. Cranium is incremental inorganic spend on top of this — price unknown, so the acquisition-multiple half of "cost of moat vs moat defended" cannot be computed. Flag: unknown purchase price is the research gap that would turn this from a qualitative revealed-preference signal into a quantitative one.

From the 10-Q primary-solution table (Q2 2026 vs Q2 2025, $000):

I&A is now 59% of Payment Software (was 47% a year ago). RTP is 12% and fell $16.6M YoY on renewal timing (management's stated cause). Cranium SYNAP attaches to the I&A / Connetic-for-Cards stack (card authorization), not to Fedwire/RTP. The queue technology tag "Real-Time Payments Software" is therefore a stale primary-product label: the scarcity (Fedwire 2/3, SWIFT 15%) still lives in RTP/wires, but the economic capture that is compounding is card issuing/acquiring (+33% cc) plus a bolt-on cloud-native switch.

Backlog mix (10-Q): total 60-month backlog $7,281M = 4.14× FY2025 revenue. Renewal share rose to 70.8% ($5,153M) from 68.3% at YE2025; committed fell $176M (−7.6%) to $2,128M. Visibility is slightly more assumed-renewal and less contracted — consistent with net-new ARR −25% even as the installed base holds.

Sensitivity: if RTP stays at the Q2 run-rate ($23M × 4 ≈ $92M) it is ~5% of FY26 guided revenue (~$1.91B midpoint) — not thesis-defining. If I&A holds the Q2 run-rate ($116M × 4 ≈ $465M) it is ~24% of guided revenue and the actual bottleneck ACI is paying Cranium to accelerate.

A large bank at $10–30M/yr payment-software spend still faces 3–5× annual spend to recertify against Fedwire/SWIFT/RTP/FedNow/card schemes + dual-run (prior note). Using the current backlog as the empirical stickiness proxy:

• Renewal backlog $5,153M / 60-month total $7,281M = 70.8% assumed renewal.
• That is management treating >70% of five-year visibility as "they will not leave." Combined with "no customer >10%" (10-Q), this is a diversified toll, not a single-account hostage.

• bypass = 2 — FIS/Fiserv/Mastercard Vocalink/Finastra/Form3/in-house exist; Cranium itself is evidence that a cloud-native switch can be built and put into production at two large processors. Switching remains recertification-gated and multi-year.
• concentration = 2 — mission-critical per bank, no customer >10% of ACI revenue. I&A 59% of Payment Software is product concentration, not customer concentration.
• hyperscaler = 3 — 10-Q names Azure/AWS as deployment partners for Connetic, not rail competitors. Scheme certification is the gate they do not hold.
• toll_road_score = 7 → STRONG PROXY (unchanged). Cheat-sheet analog: payments-software / scheme-certified hub, not NHI (7–8) and not Identity/SSO (4–5).

• technical_scarcity = 7/10 (— vs 08-29) — Fedwire >2/3 + SWIFT ~15% (10-Q) still the scarcity anchor. SYNAP-in-production at two large processors raises the cloud-native bar but also proves the architecture is replicable (Cranium did it as a private specialist). Not an 8: alternatives exist and ACI had to buy the switch rather than ship it from Connetic-for-Cards (launched March, still buying capability in September).
• economic_capture = 7/10 (—) — Payment Software 48% adj. EBITDA; I&A +33% cc; recurring 78% of Q2 ($336/$430). Capped by net-new ARR −25% / TTM −15%, RTP −42%, Biller net −3%, and committed-backlog −7.6%. Capture of the installed base is intact; capture of new ARR is the weak leg.
• time_to_monetize = 8/10 (↑ from 7) — Cranium close expected Q3 2026 (this quarter as of 2026-09-05); Connetic for Cards already in market (Mar 2026); 2 U.S. customers + 8 U.S. networks (EX-99.1 08-06); FY26 guide raised to $1.895–1.925B / $545–560M adj. EBITDA; Q3 print $417–427M. Near-dated binary is the close + whether I&A expansions continue in H2 (40/60 Q3/Q4 weighting on license renewals).

The Biller exploration is the most thesis-material item: the note's own Worked Calc 2 flagged Biller as "the processing utility is not helping blended capture" (net-of-interchange −3%, 51% vs 56% net margin). A divestiture would directly neutralize that disconfirming evidence.

• Biller economics (FY2025): ~$818M revenue, ~$141M adj. EBITDA → 17.2% margin (Reuters via annual filing). The buyer would pay ~$1.5B = 1.83× revenue / 10.6× EBITDA for a stable cash-flow utility (IRS, Blue Cross Blue Shield affiliates, Akron Utilities, Horizon Healthcare) — a processing asset, not a toll.
• Current EV: market cap $5.34B + net debt $659M ≈ $6.0B.
• Pro-forma software-only EV: $6.0B − $1.5B ≈ $4.5B.
• Software-only revenue: FY2025 total $1,759.8M − $818M ≈ $942M (10-K).
• Software adj. EBITDA (Q2 run-rate): $94M × 4 = $376M annualized (8-K EX-99.1).
• Implied software multiple: $4.5B ÷ $376M ≈ 12× — a software multiple on a software asset, versus the blended ~24× trailing PE / ~5.3× revenue the stock carries today as a payments processor.
• Margin re-rating: divesting the 17.2%-margin utility and redeploying proceeds (pay down $659M net debt, leaving ~$841M net cash, then buyback/M&A) would lift the blended margin toward the 48%-margin Payment Software franchise.