Mergers and acquisitions, or M&A, sound like Sandton boardroom talk. Really, it’s corporate dating and marriage, with the occasional messy divorce. Here’s what it means when your shares get caught up in one.
By The Money Maze | Listen to the episode: Spotify
Every few months a SENS announcement drops with words like “firm intention”, “scheme” or “cautionary”. Your share price jumps or tanks, and you’re left wondering whether to celebrate. This one’s the decoder ring.
What is a merger?
A merger is when two companies combine into one. Think marriage. Sometimes it’s love, sometimes the families arranged it, and sometimes neither company wanted to be alone anymore.
South Africa’s most famous example: SABMiller and AB InBev. SABMiller grew from South African Breweries into a global giant. AB InBev, owner of Budweiser and Stella Artois, was even bigger. The deal, completed in 2016, created the world’s biggest brewer. Two heavyweights who stopped fighting and shared a Castle Lite instead. Technically AB InBev acquired SABMiller, which shows how blurry the line between “merger” and “acquisition” can be.
The theory behind any merger is that the two together are worth more than apart. Economists call it synergy. In plain terms, it’s hoping one plus one equals three.
What is an acquisition?
An acquisition is simpler: one company buys another.
It can be friendly, with flowers, chocolates and a big cash offer, agreed with the target’s board. Or hostile, when the buyer goes straight to shareholders over the board’s objections. That’s the unwanted cousin who arrives at the braai, refuses to leave and eventually eats your chops anyway.
Walmart is a good local case. It bought a controlling stake in Massmart in 2011, promising lower prices and global supply-chain muscle. In 2022 it bought out the remaining shareholders in a R6.4 billion deal, and Massmart was delisted from the JSE.
Sibanye-Stillwater’s takeover of Lonmin, completed in June 2019, was less romance, more rescue. Lonmin, a struggling platinum producer, was bought in an all-share deal, and Lonmin shareholders received Sibanye-Stillwater shares.
Why companies do M&A
- Growth: faster than building from scratch. Want more burger outlets? Open 100 yourself, or buy a chain.
- Synergies: cost savings from sharing offices, systems and buying power. Two families moving in together and realising they need only one streaming subscription.
- Market power: fewer competitors can mean more pricing power, which is exactly why the Competition Commission reviews big deals.
- Diversification: spreading risk across products or regions. Planting mielies and cabbages in the same garden.
How M&A affects shareholders
Share price reactions
The target’s share price usually jumps, because buyers almost always pay a premium over the market price to convince shareholders to sell. The buyer’s share price often wobbles, as the market worries about debt, overpaying or whether management has bitten off more than it can chew.
Cash, shares or both
You can be paid in cash, in shares of the buyer, or a mix. Cash is simple: you know what you’re getting. Shares mean you become a shareholder in the buyer, so the value of your payout moves with its share price.
Schemes, offers and delisting
On the JSE, many takeovers use a scheme of arrangement, which needs 75% shareholder approval and then binds everyone. Others are general offers, where each shareholder decides. Either way, if the buyer gets everything, the target usually delists, and you can’t trade it anymore.
When companies split up
Not all corporate surgery is about joining. Old Mutual’s “managed separation” around 2018 split the group, with Quilter listed separately in London, a large slice of the Nedbank stake unbundled to shareholders, and Old Mutual Limited listed in Johannesburg. A reverse wedding, with everyone keeping their own Tupperware. That’s an unbundling, and it can unlock value when the parts are worth more than the whole.
The risks: why many deals disappoint
Studies and experience say plenty of deals fail to deliver. Cultures clash, costs spiral, promised synergies never show up, and buyers overpay in the excitement of the chase. It’s like moving in with your partner and only then discovering they leave the toothpaste cap off and hog the duvet.
For investors, that means a big deal isn’t automatically good news, even if the announcement is full of words like “transformational”.
Questions to ask when a deal is announced
- What premium is being offered, and over what reference price?
- Cash, shares or both? What’s the buyer’s share price risk?
- How is the buyer funding it? Lots of new debt?
- What approvals are needed: shareholders, Competition Commission, regulators?
- If you hold the target, do you want to own the buyer?
Stokvel Starter Pack
- Merger: two companies combine, like a marriage.
- Acquisition: one company buys another.
- Synergy: the hope that one plus one equals three.
- Premium: what a buyer pays above the market price.
- Hostile bid: an offer the target’s board doesn’t support.
- Unbundling: splitting a company into separate pieces.
Takeaway: M&A usually rewards the target’s shareholders first. Whether it rewards the buyer’s shareholders depends on price, debt and execution, and the jury often stays out for years.
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More from The Money Maze
- Curro (JSE: COH): The R7.2bn Buyout and Nonprofit Pivot
- Shareholder Meetings, Resolutions and Voting Rights Explained
- JSE Suspensions, Delistings and Vanishing Shares Explained
- Hyprop Pulls the Plug on the MAS Deal Over DJV Drama
Sources
- Walmart completes R6.4bn purchase of Massmart, Moneyweb, Nov 2022.
- Sibanye-Stillwater: completion of the acquisition of Lonmin, Sibanye-Stillwater filing, Jun 2019.
- Corporate action timetables (Form H1), JSE Limited, Oct 2025.
This is not financial advice.
