AUDIOBOOM GROUP PLC (BOOM) — Investment Research Note

Executive summary

Audioboom is a global podcast platform combining hosting/ad-tech infrastructure with a curated network of ~8,000 podcasts (5th largest US publisher), monetising via premium host-read ads, its Showcase automated ad marketplace, and Sonic brand services. The operating trajectory has inflected sharply — revenue $65m (2023) → $73m (2024) → $80m (2025) → $81m already booked H1 2026, while adjusted EBITDA moved from a $0.4m loss (2023) to $3.4m (2024), $5.1m (2025), with $3.2m already delivered in H1 2026 (+80% YoY). The single most important valuation point is that the Board rejected three indicative cash bids in June 2026 that all priced above the 540p pre-review closing price 2026-06-08, and the shares now trade at 466p — below the level the acquirers themselves offered — despite accelerating operating leverage and imminent access to a $10m RCF.

Fair value estimate

Range: 500p – 650p per share, implying a market cap of £91m – £118m

Methodology: EV/EBITDA multiple on 2026 estimates, cross-checked against the Board's rejected-offer floor.

Key assumptions:

• 2026 revenue: ~$95–100m (H1 $45.7m + seasonally stronger H2, US mid-terms tailwind, $81m already booked mid-July 2026-07-15 half-year)
• 2026 adjusted EBITDA: ~$8–10m (H1 already $3.2m, seasonal H2 skew, fixed cost base contained)
• FX: ~$1.28/£
• Multiple: 11–14x forward adj. EBITDA (podcast/ad-tech peers; discounted for AIM small-cap illiquidity)
• Cross-check: Board rejected offers priced >540p in April 2026, saying they undervalued the company 2026-06-08. That is a management-anchored floor, not the ceiling.

At 466p (£85m mcap), the stock trades at ~10x 2026E EBITDA. Mid-point fair value ~575p implies ~23% upside; low end 500p ~7% upside; high end 650p ~40% upside.

Sector context

Correctly classified as Technology (ad-tech and monetisation platform), though revenue is essentially digital advertising against media content. Compared to typical Tech sector constituents, quality is below typical peers (smaller scale, AIM-listed, ~15% margin), growth is above typical (30% organic H1 2026), leverage is below typical (net cash, no debt). Closest listed peers: Acast (Nasdaq First North, larger scale), iHeartMedia (US, more legacy radio), and to a lesser extent Global Media (private). None are pure comparables; Audioboom is arguably the closest listed pure-play independent podcast operator.

Investment thesis

• Operating leverage is now visible in the numbers. H1 2026 revenue +30%, gross profit +33%, adjusted EBITDA +80%. Headcount rationalised back to 44 (vs. 42 pre-Adelicious), opex up only 18% while revenue rose 30% 2026-07-15 half-year. Showcase (higher-margin ad-tech marketplace) grew 60% and now contributes 41% of revenue — the mix shift itself lifts group gross margin.
• Balance sheet is unencumbered and getting stronger. Group cash $5.4m at 30 June 2026, $3.3m overdraft, and a $10m HSBC RCF completing shortly — total ~$18m of liquidity against no term debt. Onerous contracts concluded end-2025, so adj EBITDA reverts to being a proxy for cash generation 2026-04-16 final results.
• Valuation floor is management-anchored. The Board rejected three indicative cash offers in April 2026, all pitched above the 540p pre-review price, judging them to undervalue the company given its H1 2026 acceleration 2026-06-08 trading update / strategic review. The current 466p is ~14% below that de-facto floor.

Key risks

• Podcast partner minimum guarantee exposure. Total MG commitments of $33m at end-2025 2026-04-16 final results. Two prior contracts became onerous in 2023 and drove $5m+ of losses through to 2025. Management has tightened its MG discipline, but the model still requires financial commitments to top-tier talent and mispricing in a soft ad market could recur.
• Growth requires M&A execution. The 2030 aspiration of $200m revenue / $40m adj EBITDA requires "four to five further acquisitions" 2026-07-15 half-year. Adelicious worked (goodwill impairment aside), but doing this 4-5x with a $10m RCF and equity is not risk-free.
• Customer concentration. In 2025 one advertising agency represented 20% of invoiced revenue 2026-04-16 final results. Loss or reduced spend from that agency would be material.

Operating leverage

This is the strongest quantifiable element of the story. The fixed cost base — 44 headcount, ~$1.1m/month opex — is now largely set and management explicitly states it "does not need to increase materially to support the Company's growth trajectory" 2026-04-16 final results. In H1 2026, 30% revenue growth translated into 33% gross profit growth and 80% adj EBITDA growth; incremental revenue is converting at >20% into adj EBITDA per Q1 2026 disclosure. Gross margin trajectory is favourable because Showcase (higher gross margin) is the fastest-growing line — the mix effect adds ~100bps/year. Applying that framework: a 10–20% revenue beat over expectation would plausibly deliver ~1.5–2x that as an adjusted EBITDA beat, translating incremental revenue at ~20–25% contribution margin. Video monetisation is currently a headwind (lower RPM than audio) but management sees this as the medium-term unlock as Spotify/Apple integrations mature 2026-07-15 half-year.

Value-trap signals

• Historic onerous contracts ($7.5m 2023 provision) — now fully resolved, but the model retains this risk.
• Customer concentration on one advertising agency (20% of invoicing).
• Small-cap AIM illiquidity (18.1m shares, £85m mcap) — limited institutional participation.
• Related-party history around the SPV content funding facility (now expired). Not currently active but worth noting.
• Otherwise: revenue is growing, EBITDA is growing, cash is growing, no dividend cuts (never paid), no guidance misses in the last 8 quarters — none of the classic value-trap signals present.

Earnings vs. expectations

Reviewing the trading updates from Jan 2024 through July 2026: management has raised guidance materially in the last three cycles. In Nov 2024 they raised 2024 adj EBITDA expectations from previous market view to $2.5m; in Dec 2024 they raised again to $3.1m; in Jan 2025 they confirmed $3.4m — a triple upgrade 2025-01-15 trading update. 2025 delivered $5.1m adj EBITDA "ahead of market expectations" 2026-04-16 final results. Q1 2026 delivered 118% adj EBITDA growth and Q2 continued the acceleration to +80% H1 EBITDA growth. The pattern is consistent beats and consecutive positive guidance revisions — no missed quarters in the last 8 disclosed periods.

Conviction

Conviction: 4 — high.

Anchoring factors: (i) clean, well-disclosed audited financials with an unqualified opinion; (ii) an unusually strong external validation of intrinsic value via the rejected Q2 2026 takeover bids priced above the current price; (iii) a consistent track record of beating raised guidance across three years. Limiting factors: (i) 2026 EBITDA range is still a mid-year estimate that depends on Q4 US mid-term ad demand materialising; (ii) the 2030 aspiration is heavily M&A-dependent and I have low visibility into that pipeline. Overall I am confident that the shares are at least fairly valued and probably modestly undervalued to my mid-point.

Driver scoring commentary

AI beneficiary — LOW/MEDIUM. Audioboom uses AI internally (Sounder AI for brand-suitability targeting, Adaptive Ads for creative generation 2026-04-16 final results) but is not a direct receiver of AI capex. The proprietary listener/podcast data has some AI-training value but this is not yet a monetised revenue line. Podcast content is more likely to be disrupted by AI-generated audio than accelerated by AI spending. This is the weakest driver for this investor profile.

Operating leverage — HIGH. As discussed above, the model is delivering ~2.5x adj EBITDA growth per unit of revenue growth, with a largely fixed cost base and mix-shift tailwinds.

Cyclicality — MEDIUM. Digital advertising is meaningfully cyclical (the 2022-24 downturn is on the record), but podcast advertising has proven more resilient than display within digital ads.

Moat — LOW/MEDIUM. Some network effects on the ad marketplace side and content-partner switching costs, but not durable, structural moats. Execution rather than structural advantage.

Balance sheet — VERY STRONG. Net cash, no debt, imminent $10m RCF, unencumbered.

Earnings quality — GOOD. Cash conversion is now clean post-onerous contracts. Debtor days improving.

Management quality — GOOD. Delivered on Adelicious integration, sensible capital allocation, disciplined bid rejection.

Growth momentum — HIGH. 30% organic H1 with H2 seasonally stronger.

Overall score commentary

The investor profile prioritises AI-receiver exposure (~35%), and Audioboom's AI angle is thin — this is the primary drag. On operating leverage, valuation discipline, and downside protection, however, this scores well: the company is materially operationally geared, priced below what strategic acquirers offered a quarter ago, and has a fortress balance sheet. Net-net, this is a mid-band idea for this strategy — interesting on quality/valuation/leverage grounds but the AI thesis is genuinely weak.