We have some exciting news to share! The Motley Fool UK has now become an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. We’ll be introducing a new name and brand over the coming weeks — we're very excited to share it with you and embark on this new chapter together!

Synairgen rockets 450% on positive Covid-19 trial news! Is now time to buy?

Synairgen shareholders are popping corks today as the share price soars. Are positive Covid-19 trial results reason enough to buy?

| More on:

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

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.

Synairgen (LSE:SNG) early investors have made a fortune today after the Covid-19 testing firm reported breakthrough trial results.

The AIM-listed biotech reported positive results from an early trial of its SNG001 drug.

Synairgen said its respiratory coronavirus treatment produced a 79% lower risk of patients developing severe disease compared to those given a placebo.

Patients who received the inhaled interferon beta drug were “more than twice as likely to recover over the course of the treatment”, the UK company said.

Shares soared over 5oo% in the early hours of trading on Monday, before settling closer to 450% towards the end of the day.

But even with this huge jump, I think Synairgen could go higher.

Buy Synairgen now?

Covid-19 testing firms have been in a pharma arms race since the novel coronavirus first hit our shores.

Those with the best prospects have been propelled to epic new heights.

And there are investors on both sides of the Atlantic keen to profit from buying the winners from Covid-19 testing. So I think there are a multitude of buyers who will support the Synairgen share price at current levels and higher.

This has been backed up by City analysts. Broker finnCap tripled its price target from 120p to 360p on the back of the breakthrough news. That target is 110% higher than the Synairgen share price now.

And all the positive press from the likes of Sky News, BBC, and even CNBC in the US is good for the Synairgen share price.

Caveats

I will put forward a few reasons not to buy Synairgen, for the sake of balance.

This could be a case of ‘buy the rumour, sell the news’. Small, unprofitable, as-yet-unproven companies tend to attract speculators happy to take on massive risk. Their rewards could be spectacular. But if Synairgen can’t bring a product to market quickly, the share price could deflate just as fast as it soared.

I’m also not convinced Synairgen is a share I’d buy and hold for 20 years. This is AIM, after all. Financial reporting requirements are less stringent than on the main market. It is definitely more of a punt than sticking to quality, high-value FTSE 100 shares.

Less than a year ago Synairgen was trading at 6p. Its fair value could be as low as 40p. This is an equation based on earnings per share, annual earnings growth, and return on capital.

There is still a big ‘if’ attached to Synairgen. If hope and hype wanes, the share price will likely trend back towards its fair value.

Buy or sell Synairgen?

When I last covered Synairgen back in April, its market cap was just £75 million — right at the bottom of the range I’d be happy investing in.

With this news of a potential Covid-19 trial breakthrough, the company’s market cap has hit £260 million.

And volume has soared as the market digests the news. 22 million shares had changed hands before noon on Monday 20 July.

So with more liquidity available (more people buying and selling) there is a better chance for investors buying now to get in and out of positions at the price they want.

It’s okay to let others take on all the early risk by investing in unproven companies. I’d still say Synairgen is worth a short-term punt, but don’t put your life savings on the line.

Tom Rodgers has no position in the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Investor looking at stock graph on a tablet with their finger hovering over the Buy button
Investing Articles

Am I crazy to consider this risky FTSE 100 bank stock over Rolls-Royce shares?

Mark Hartley weighs up the pros and cons of investing in a FTSE 100 growth stock that’s giving Rolls-Royce shares…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

How did HSBC pay more passive income via dividends in 2025 than any other British company?

Despite only an average yield, HSBC was the UK's passive income hero of 2025, paying out more in dividends than…

Read more »

The flag of the United States of America flying in front of the Capitol building
Investing Articles

1 S&P 500 name I can’t stop buying in my Stocks and Shares ISA

S&P 500 software companies have been falling out of the sky. But Stephen Wright's been focusing on one in particular…

Read more »

Young brown woman delighted with what she sees on her screen
Investing Articles

Analysts reckon the Lloyds share price should be 21% higher!

James Beard’s been looking at the latest Lloyds Banking Group share price forecasts. But is the bank’s stock really worth…

Read more »

Investing Articles

How much time and money would it take to become a stock market millionaire?

Is it realistic to aim for a million by investing a few hundred pounds a week in the stock market?…

Read more »

Fans of Warren Buffett taking his photo
Investing Articles

Want to start buying shares? How good are you at these 3 things?

This trio of simple questions can help provide some food for thought to anyone who wonders whether they are ready…

Read more »

Three generation family are playing football together in a field. There are two boys, their father and their grandfather.
Investing Articles

How to target a £1,183 monthly passive income in a SIPP for life!

Own a Self-Invested Personal Pension (SIPP)? Here's how you could maximise your chances of a comfortable retirement by buying dividend…

Read more »

Affectionate Asian senior mother and daughter using smartphone together at home, smiling joyfully
Investing Articles

What are the best shares to buy to earn £1m or more in an ISA?

Searching for the best ISA stocks to buy to target a million? Royston Wild discusses the key things to look…

Read more »