AIB Group plc (AIBG) — Investment Research Note

Executive summary

AIB is Ireland's dominant retail and commercial bank with ~3.4m customers, a 30% mortgage market share, c.€73.5bn of gross loans and c.€117bn of deposits, listed in both Dublin and London (CDIs) following the Irish State's full exit in June 2025 2025-08 half-year. The trajectory across the filings shows a sharp rate-driven earnings step-up in 2022–24, peak NII in 2024 (€4.0bn), a moderating but still very strong 2025–26 (NII guided to ~€3.8bn) with RoTE consistently >20% versus a 15% medium-term target 2026-04 Q1; 2025-11 Q3. The single most important valuation point: AIB earns supernormal RoTE today on a falling rate path, the share has re-rated accordingly, and at the current £17.9bn market cap the multiple already discounts a soft-landing on NII alongside continued >€1bn-per-year capital return.

Fair value estimate

Methodology: primary — through-the-cycle earnings × P/E, cross-checked with P/TBV.

Key assumptions:

• 2026E PAT ~€1.85–1.95bn (derived from guided RoTE >20% on tangible equity of ~€9bn, consistent with H1 2025 PAT €927m run-rate) 2025-08 half-year
• Normalised mid-cycle PAT closer to €1.5–1.7bn as NIM (2.65% in Q1 2026, from 3.24% in H1 2024) reverts to ~2.4% in a 2% ECB world and RoTE converges to the 15% medium-term target 2026-04 Q1; 2026 medium-term targets
• Share count ~2,000m post the €1bn buyback announced March 2026 2026-04 Q1
• EUR/GBP 1.18 (current spot region)
• Through-the-cycle PAT of c.€1.6bn → c.£1.36bn → ~68p EPS; P/E range 9–11x reflecting strong capital, durable franchise and ongoing buybacks

Fair value range: 680p – 880p per share (£13.6bn – £17.6bn implied market cap)

• Midpoint: 780p / £15.6bn
• vs disclosed market cap £17,932.2m → mid-case downside ~13%, range from -24% to -2%

Cross-check: at 1.5–1.8x TBV (TBV ~€4.50/share = ~380p), fair value is 570–680p, suggesting the upper end of the P/E range is rich.

Sector context

Sector: Financials / Banks — confirmed (ICB Super-Sector: Banks). AIB's profile sits above the European bank average on quality (CET1 16.0% Q1 2026 vs typical 13–14%; cost-income 44% vs sector ~55%; RoTE >20% vs sector low-to-mid teens) but at a more cyclically-elevated NIM than UK peers given Irish deposit beta of only ~20% 2026-04 Q1. Listed peers: Bank of Ireland Group (BIRG), Permanent TSB (PTSB) (direct Irish peers), and NatWest / Lloyds as UK comparators with similar rate-cycle and capital-return profiles.

Investment thesis

• Capital-return engine is real and recurring. €1bn buyback launched March 2026 with €198m already executed at €9.21 average, plus 46.257c final dividend (~€985m) 2026-04 Q1; 2026-04 AGM result. Capacity for continued >€1bn/yr returns from c. +80bps/quarter organic capital generation, on top of base 40–60% ordinary dividend policy 2025-08 half-year.
• Structural reduction in interest-rate sensitivity protects NII in a lower-rate world. Hedge programme expanded by €15bn in H1 2025 and another €10bn in March 2026; +100bps NII sensitivity has compressed from €387m (Dec-25) to €256m (Mar-26), and 2026 NII guidance of ~€3.8bn was held despite ECB cuts 2026-04 Q1.
• Asset-quality and balance-sheet are fortress-grade for an Irish bank. CET1 16.0%, LCR 194%, NSFR 158%, NPE ratio just 2.3% (vs ~5.4% in 2021), CoR of 20–30bps with continued small writebacks/charges across cycles 2026-04 Q1; 2025-11 Q3.

Key risks

• NII normalisation as ECB rates settle. NIM has compressed from 3.24% (H1 2024) to 2.65% (Q1 2026); a sharper-than-guided rate cut path would force consensus downgrades and unwind the RoTE > target 2024-08 half-year; 2026-04 Q1.
• Concentration in Irish mortgages / Irish CRE. 75% of CRE book is ROI; corporate/commercial Ulster Bank loans absorbed at scale — any domestic property correction or recession hits both volumes and impairments (Stage 2 CRE migrations and €91m H1 2023 CRE-led charge already disclosed) 2023-07 half-year.
• Capital-return trajectory depends on a still-tight regulatory regime. Basel IV gave +120bps in 2025; future model changes (IRB, SRT expansion) cut both ways, and the Irish bank levy (~€100m/yr) is a political variable 2025-11 Q3.

Operating leverage

AIB's leverage to a revenue surprise is moderate, not asymmetric. Cost-income ratio of 44% (Q1 2026) means roughly 44% of incremental gross revenue drops to operating profit before tax — better than universal banks (~55–60%) but a long way from a software platform. The absolute cost base is anchored at <€2bn with guided ~2% inflation in 2026; FTEs are flat-to-down (10,196 in Q1 2026 vs 10,617 in H1 2024) 2026-04 Q1; 2024-08 half-year. On a 10–20% NII surprise (e.g. NII €4.2–4.6bn vs guided €3.8bn), incremental pre-tax profit would be c.€340–760m, lifting PAT by ~16–35% — material but not a multi-bagger of profit. The genuine leverage lever is the deposit beta (held at ~20%, exceptional for Western Europe) and the structural hedge — both already largely captured in the current numbers rather than ahead of consensus. No software-like fixed-cost inflection here.

Value-trap signals

None identified. Loan book is growing (1.7% Q1 2026; new lending +11%), dividend is rising not cut, no guidance misses across the visible filings, NPEs declining, capital ratios building, share buybacks ongoing, and the Irish State exit in June 2025 removed the overhang and forced-seller dynamic 2025-06 disposal of remaining stake. The risks above are cyclical, not structural.

Earnings vs. expectations

The track record across this filing set is consistently beat-and-raise. 2023: NII guidance raised from >€3.3bn (Q1) → >€3.6bn (H1) → >€3.75bn (Q3) → delivered exceptional FY 2023-05; 2023-07; 2023-11. 2024: NII guidance raised from >€3.65bn (Q1) → c.€4.0bn (H1) 2024-05; 2024-08. 2025: NII raised from >€3.6bn (H1) → >€3.7bn (Q3), loan growth raised, exceptional gain raised 2025-08; 2025-11. 2026 guidance reiterated at Q1 with strong delivery 2026-04 Q1. Pattern: management has been consistently conservative on rate-cycle benefits, with very few visible misses.

Conviction

Conviction: 4 (high). Anchors: (a) disclosure quality is high — quarterly trading updates, explicit rate-assumption disclosure, sensitivity tables; (b) two valuation approaches (forward P/E and P/TBV) converge to a similar range; (c) very clean execution track record reduces estimation risk on the base case. Caveats: (a) terminal NIM in a sustained low-rate world is the single biggest sensitivity and the filings don't bracket it tightly enough; (b) the Irish economic cycle (housing, multinational tax base) is a non-diversifiable single-country risk that compresses the precision of a long-run earnings power estimate.

Driver scoring rationale

• ai_beneficiary (20): AIB is a spender on AI — explicit enterprise Microsoft Copilot rollout to 10,000+ employees 2025-08 half-year. No AI-driven revenue line, no AI-augmented value-per-customer monetisation, no proprietary-data play. Productivity captured but value flows to Microsoft.
• operating_leverage (50): CIR 44% gives moderate operational gearing, but ~half of incremental revenue is consumed by cost. No software-like fixed cost wedge.
• earnings_surprise_trend (75): Sustained beat-and-raise pattern across 2023–2025; multiple sequential NII upgrades, exceptional gain raised in 2025.
• cyclicality (65): Bank, rate-cycle exposed, Irish housing & CRE exposure. Moderately cyclical.
• moat (55): 30% mortgage share in a concentrated 3-player Irish market (post-Ulster/KBC exit), 3.4m customers, low deposit beta — durable but not unassailable.
• leverage (55): Banks are inherently balance-sheet-leveraged; using regulatory ratios as proxy, CET1 16% is well above minima, NSFR 158%, but the institution remains a leveraged credit intermediary.
• earnings_quality (70): Clean disclosure, conservative ECL coverage, exceptional items quantified separately, strong organic capital generation matches reported PAT.
• management_quality (75): Delivered Ulster Bank integration, executed State exit, hit/beat targets, disciplined capital return — value-accretive directed buyback at sensible levels.
• growth_momentum (60): Loan growth c.5%/yr guided through 2027, deposits +2–3%, new lending +11% in Q1 2026 — stable mid-single-digit.