Stock Crash Scenario

Stock Crash Scenario — ConvaTec Group plc (CTEC)

1. Thesis: what a "crash" actually looks like here

A crash in CTEC over the next ~12 months is not a generic risk-off air-pocket — it is a specific path that runs through the 4 August 2026 H1 print. The tape is already in a stressed regime: shares closed at 205.20p on 8 May 2026 — exactly on the 52-week low, 12.2% below the 200-day SMA, with the 27 August 2025 death cross still in force (review/final/technicals-claude.md). The base bear case re-rates to 165p (~−20% from spot) on a Smith+Nephew-style 12.2x EV/EBITDA peer compression against an FY26E EBITDA cut to ~$500M (bear-claude.md — Downside and trigger). A deeper "stress" floor sits at the FY18 historical low zone near 146p (down ~29% from spot), which is where the long-cycle chart resolved the post-IPO repricing in 2018–19 (review/final/technicals-claude.md — price_history table, Dec 2018 138.95p / Feb 2019 132.65p / monthly close lows in the 140s).

The crash channel is mechanical, not speculative: (i) a single H1 print below the FY26 ≥23% adjusted operating margin guide forces consensus to cut FY26/FY27 EPS and EBITDA; (ii) the working-capital flag (DSO 53→63d, +$111M payables release) is in the same release and removes the cash-quality defence if it reverses (review/final/forensics-claude.md); (iii) the multiple compresses toward the Smith+Nephew peer at 11–12.2x EV/EBITDA on a smaller base; (iv) the 199p Bollinger lower band breaks and the FY18 chart context comes back into play (review/final/technicals-claude.md — Section 8). None of the four legs requires new bad news; each is the dossier's identified bear pillar firing as expected.

2. Crash scenario KPI grid

The percent-of-loss math anchors the rest of the page. From 205.20p, roughly −20% gets to the bear's modelled 165p and roughly −29% gets to the FY18 chart context near 146p. Realized 30-day vol of 33.3% sits above the five-year 80th percentile of 31.8% — the market is already paying a wider risk premium, so the variance to a binary print is itself elevated (review/final/technicals-claude.md — Section 6).

3. Trigger ladder — the specific events that take the stock down

The trigger ladder is ordered by how directly each event re-rates the equity. Every row maps to a dated catalyst or a measurable threshold already disclosed in the dossier.

The single biggest sensitivity is the top row. Mason's H1 print absorbs the full tariff load and the Unomedical remediation spend in the same release — the explicit guide is ≥23%, but the underlying margin already compressed to 10.9% IFRS in H2-25 from 15.2% in H1-25 (numbers-claude.md — semi-annual margins). The forensic working-capital reversal sits in the same release, so a bad H1 fires two of the four bear pillars at once.

4. Earnings → multiple bridge

The bear's price target is mechanical, not narrative. Take the dossier's components and round-trip them through a peer multiple. FY26E EBITDA is FY25's $540M minus ~$40M of margin slippage (FDA remediation spend, InnovaMatrix biologic step-down, and tariff phasing) ≈ $500M (bear-claude.md — Downside and trigger). Net debt is $1,450M, shares outstanding ~1,954M, GBP/USD ~1.27.

The bear case is the second row — 12.2x on $500M EBITDA delivers 187p. The dossier's headline 165p bear anchor sits between the 12.2x and the 11x lines, and is the number the verdict tab uses as the cover-side framing (verdict-claude.md — Downside target). The 11x × $500M line is the verdict triangulation against the Financials-tab bear case; the 10x × $480M line is the deeper-stress floor calibrated to the FY18 ~146p chart context. All four rows assume the buyback continues or is at most paused; a Fitch move to negative outlook would force another leg of multiple compression that this table does not model.

5. Historical analog drawdowns

The current setup is not unprecedented for CTEC — the listed history has two prior episodes that match this shape (price below 200-day, momentum bearish, vol elevated, single-issue overhang). Both resolved with at least a 30% peak-to-trough draw before basing.

The 2017 Q4 episode is the most informative analog: a confirmed peer-multiple compression on an idiosyncratic earnings revision, with no balance-sheet event, that printed −32.4% peak to trough before basing for two quarters. The 2018 episode is the deeper analog: when a margin walk-back paired with a leadership reset, the equity went to the 132–138p range before the FCF compounding story restarted in mid-2019. From the May-2025 peak of 289.80p, the current draw is already −29.2% and is the same shape — the bear's 146p stress floor is exactly the lower edge of that 2018 base.

6. Liquidity and implementation under stress

Liquidity behaves asymmetrically in a crash: market-makers widen spreads, ADV temporarily spikes on flush days but the queue depth thins, and any institution that has to exit on a binary print competes with passive index rebalances and trend-following selling. The dossier's own framing is that CTEC is "Illiquid / specialist only" at the issuer-stake level because no 0.5%+ market-cap stake clears in five days at 20% ADV (review/final/technicals-claude.md — Section 7).

Translation for a crash path: a fund running a 1% issuer stake needs roughly 13 trading days at aggressive 20% ADV participation to exit, 26 days at conservative 10%. If the H1 print misses and the tape gaps lower on the open, the first 24-48 hours of selling will compete with index-tracker outflows on the FTSE 100 weight — meaning realized implementation costs will exceed the 1.08% median intraday range. The 20 November 2025 flush at 6.79× average volume on a flat-to-down close was distribution in the prior leg (review/final/technicals-claude.md — notable_spikes); the next flush, if triggered by H1, will not have the same patient bid behind it because the index-weight rebalance washes through first.

7. Disconfirming signals — what would break the crash thesis

The crash view is conditional. Each of the following observable signals would invalidate one or more legs of the thesis; if multiple fire together, the whole scenario fails by design.

The 21 May 2026 trading update is the first observable test, T+12 days from current price (review/final/catalysts-claude.md — Section 6). A confident reaffirmation does not eliminate the H1 binary, but it shrinks the implied dispersion and gives a window to reclaim 234p before the print.

8. Risks to the crash view — what saves CTEC even if some triggers fire

Symmetry matters: even in a bad H1, several structural defences are intact and would cushion an outright crash below the bear's 165p.

The most important of these is the mechanical amortisation roll-off: $95M of BMS-era intangible amortisation runs off in 2026 regardless of management action, which closes the IFRS-vs-adjusted earnings wedge and supports the bull's "cash is real" thesis (verdict-claude.md — cash quality debate). That alone does not stop a crash triggered by an H1 miss, but it puts a floor under the recovery trajectory once the print is past.

9. Bottom line — quantify the asymmetry

The crash scenario is not the base case in the dossier — the assembled verdict is "Lean Long, Wait For Confirmation" with a bull anchor at 310p and a bear anchor at 165p (verdict-claude.md). But the path from 205p to 165p is direct, mechanical, and resolves inside 90 days. Sized against the bull's 310p:

The asymmetry from spot is −20% to the bear and +51% to the bull, decided by one print. The crash view does not change the verdict, but it does change how to size: any pre-print initiation has to clear the 2.5:1 reward-to-risk gate the path-dependence implies, and the dossier's own technical work calls the name "watchlist, do not initiate today" off the unbroken death cross (review/final/technicals-claude.md — Section 8). If you are paid to underwrite the asymmetry, the implementation answer is to wait for the 21 May trading update tone and either the 234p reclaim or the 199p break before adding either way — not because the crash is the base case, but because the binary makes pre-print sizing economically irrational.