Gooch & Housego's 20p Gap: What a Takeover Form Says You're Actually Buying

The most revealing document in the Gooch & Housego takeover right now is also the dullest one. It is a Form 8.3, filed Thursday, in which Canaccord Genuity Wealth Limited — "for Discretionary clients" — discloses that it holds 513,834 shares of the company, or 1.8773% of it. No prices, no commentary, no drama. Just a stake and a percentage.

That is weird, and here is why: the form tells you more about what this stock is worth today than the company's own business does. Gooch & Housego, the Somerset photonics maker that supplies precision optics for air-defence systems and laser weapons, is being bought for cash by an American private equity firm, and its shares now trade about 20 pence below the price the buyer has promised to pay. The stock is not really a stock anymore. It is a half-finished cash deal wearing a stock wrapper, and the 8.3s are the plumbing that shows who is standing around waiting for the money.

The deal in the numbers that matter

On 16 July, Gooch & Housego agreed to a recommended £345.6 million cash takeover by Arlington Capital Partners, a US private equity firm, through a vehicle called Greenlight Bidco. The price is 1,230 pence per share in cash — 40.7% above the 874p close on the day before the announcement. That is why the board recommended it unanimously: for shareholders who bought anywhere in the previous six months, the bid was, on average, a 45% windfall on top of the market price.

The company is a specialist manufacturer of optical components and systems for industrial lasers, medical diagnostics and, increasingly, defence: ring-laser gyroscopes, directed-energy weapons, periscopes, counter-drone optics. The defence story is real and recent. In the half-year to March, aerospace & defence revenue jumped 51.7% to £35.6 million while the order book hit a record £167.3 million, and the division swung to a £3.6 million operating profit from £0.6 million.

One correction matters if you are thinking of buying today. The deal is often described as "1,234.9p per share," because the buyer's offer includes a 4.9p interim dividend that Gooch & Housego paid on 24 July to shareholders on the register on 19 June. If you buy the shares now, you were not on that register. You receive the cash consideration only: 1,230p. The extra 4.9p is part of the total value for people who already owned the stock, not for you.

Why the 8.3s exist

Now the form itself. Under Rule 8.3 of the UK Takeover Code, once a takeover is announced, any person whose interest in the target's shares is 1% or more must disclose their position and their daily dealings to the market. The rule is one of the Code's weapons against insider dealing: during an offer period, when the gap between what the bidder knows and what everyone else knows is at its widest, the market is forced to trade in daylight.

The consequence is a running public register of who owns the company while the deal is pending. Over the past six weeks that register has included Octopus Investments, the merger-arbitrage fund Glazer Capital and Trium Capital, and now Canaccord's private-client book. A hedge fund and a wealth manager aggregating ordinary people's accounts, side by side, with the same motive: nobody in that pile bought Gooch & Housego to own a photonics company. They hold it to collect the cash price. The 8.3s are a map of people waiting for the deal to finish.

The 20p gap, and what it implies

Here is the tension the filings frame. The offer is 1,230p. The stock trades around 1,210p. If completion were certain and immediate, the gap would be zero: you would buy the shares, wait weeks, and receive 1,230p for every 1,210p you paid, risk-free. The gap exists because the deal is not finished. Two things fill it — the time you wait for completion (expected in the fourth quarter) and the residual risk that something breaks it first.

You can turn that 20p into an implied probability with arithmetic. Assume a busted deal sends the shares back toward where they traded before the bid, roughly 875–900p. Then the ~20p of spread, against a ~310p downside, implies investors are pricing roughly a 94% chance this deal closes — about a one-in-twenty chance it falls apart. Is 94% right? I don't know; the market doesn't either, and nothing in these disclosures says. The point is the shape: the price treats this as a near-sure thing, not as a bet on optics.

What could still go wrong

The remaining steps are mechanical but real. The scheme needs sanction from a UK court; after the effective date the shares stop trading and holders are cashed out. The deal still needs US antitrust clearance under Hart-Scott-Rodino. And it needs approval under the UK's National Security and Investment Act — which, for a supplier of defence optics to British and American militaries being sold to American private equity, is exactly the sort of review that has slowed down and sometimes stopped UK defence-related takeovers. Nothing has gone wrong yet, and no rival bidder has emerged. But this is the list, and it is why the stock sits a little below its own promised price.

There is one more line in the recent record worth reading. When shareholders voted on 26 August, the scheme passed comfortably — 79.2% of shares voted at the court meeting were in favour, and 78.6% at the general meeting. The flip side: roughly one in five of the people who bothered to vote said no. That minority believes 1,230p short-changes a business with a record order book and a newly serious defence franchise. The dissent cannot change the outcome now — the tests required 75% in value, and the deal had it. But it is the recorded answer to a real question: is the price fair? The market's answer is the 20p gap; a fifth of voting shareholders gave the other one.

Where that leaves you

If you own the stock, you are, as of the vote, holding an appointment to be paid 1,230p in cash, probably before the end of the year. There is no operating thesis left to follow — the only question that matters is whether the deal closes, and the company's own financials no longer drive your payoff.

If you do not own it but are tempted — because defence demand, because a buyer paid 40% above the market, because the business genuinely is improving — resist the story and do the arithmetic. Buying at 1,210p to collect 1,230p is a ~1.6% gain if the deal closes and roughly a 25–30% loss if it breaks, and the market has already decided, at those odds, that a break is about a one-in-twenty event. The gap exists precisely because the upside has been mostly removed and the downside has not.

That is the actual lesson of the Form 8.3, and it generalizes beyond Gooch & Housego: a cash takeover de-risks the top of a stock, converts equity into a coupon, and leaves the residual price telling you the market's real odds. The form itself is boring. Reading it correctly is the skill.