What will happen to Oil Search (ASX:OSH) shares following the Santos merger?

What happens to Oil Search shares after today?

| More on:
Two Santos oil workers with hard hats shake hands in the foreground of oil equipment.

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

If you're a shareholder in the ASX 200 energy share Oil Search Ltd (ASX: OSH), there was some big news out this morning that you should probably pay attention to.

As investors might know by now, Oil Search received a takeover offer from its fellow ASX 200 oil share Santos Ltd (ASX: STO) earlier this year. After a few bites at the apple, Oil Search finally accepted a takeover offer from Santos back in September. Well, this morning, investors were told that the merger is officially now "effective" after the scheme of arrangement was approved by the National Court of Papua New Guinea. That means that today, 10 December, will be the last day that Oil Search graces the ASX boards.

So if you own OSH shares, what happens now?

What happens to my Oil Search shares now?

Well, if you haven't sold them by the end of today's trading day, here's what happens next. Investors holding Oil Search shares are set to receive 0.6275 Santos shares for every Oil Search share held. So, say an investor owns 10,000 Oil Search shares. Following the completion of this deal, they will instead own 6,275 shares in Santos.

The combined company is set to have a market capitalisation of roughly $22 billion. It will be (in Santos' words), a "regional champion of size and scale" with "pro-forma 2021 production of approximately 117 million barrels of oil equivalent".

Here's some of what Santos CEO Kevin Gallager, had to say this morning:

Santos and Oil Search are stronger together and will have increased scale and capacity to drive a disciplined, low-cost operating model and unrivalled growth opportunities over the next decade…

The merger creates a company with strong and diversified cash flows, providing a platform to deliver shareholder returns and successfully navigate the transition to a lower carbon future.

Officially, the record date for the share transition is 14 December (this Sunday). The implementation date will be 17 December, with the new Santos shares commencing normal ASX trading on 20 December.

The Oil Search share price is currently trading at $4.06 at the time of writing, down 1.93% so far today. What a way to go out!

Motley Fool contributor Sebastian Bowen has no position in any of the stocks mentioned. The Motley Fool Australia's parent company Motley Fool Holdings Inc. has no position in any of the stocks mentioned. The Motley Fool Australia has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.

More on Energy Shares

A green fully charged battery symbol surrounded by green charge lights representing the surging Vulcan share price today
Energy Shares

PLS Group shares: After a year of outperformance, is it still a buy?

This business has charged higher. Is the ASX lithium share still attractive?

Read more »

$50 dollar notes jammed in the fuel filler of a car.
Dividend Investing

Santos, Beach Energy, or Woodside shares. Which ASX energy share paid the most passive income in 2025?

Just how much passive income did ASX energy shares like Woodside pay out in 2025?

Read more »

A man and his small son crouch in a green field under a beautiful sunset sky looking at renewable, wind generators for energy production.
Energy Shares

5 best ASX 200 energy shares of 2025

The energy sector endured a second difficult 12-month period in 2025.

Read more »

Worker on a laptop at an oil and gas pipeline.
Energy Shares

Karoon shares surge 6% as investors eye a busy 2026 calendar

Karoon shares rise sharply as the company confirms its 2026 reporting dates amid improving sentiment across energy markets.

Read more »

A barrel of oil suspended in the air is pouring while a man in a suit stands with a droopy head watching the oil drop out.
Energy Shares

Oil prices bounce after sharp sell off. Is the worst finally over?

Oil prices have bounced after a sharp sell off, but the longer term downtrend still raises questions for energy investors.

Read more »

rising asx uranium share price icon on a stock index board
Energy Shares

Up 147% since April, why this ASX 200 uranium share is tipped to keep outperforming in 2026

A top fund manager expects this surging ASX 200 uranium share to deliver more outsized gains in 2026.

Read more »

A smiling woman puts fuel into her car at a petrol pump.
Energy Shares

3 reasons to buy Ampol shares now

Brokers like the scale and growth play of the energy company.

Read more »

a group of four engineers stand together smiling widely wearing hard hats, overalls and protective eye glasses with the setting of a refinery plant in the background.
Energy Shares

Santos vs Woodside: Are these ASX 200 oil and gas shares a buy, hold or sell for 2026?

Find out what the analysts expect from these two oil and gas producers this year.

Read more »