Experts say 4DMedical, SGH, and Rio Tinto shares are buys

Are you searching for ASX shares to buy for your portfolio?

If you are, it could be worth listening to what analysts are recommending this week, courtesy of The Bull.

Here are three ASX shares given buy ratings by experts:

4DMedical Ltd (ASX: 4DX)

This medical technology company has been named as a buy by analysts at Medallion Financial Group.

It is very positive on 4DMedical's outlook thanks to its key CT:VQ platform. It explains:

4DMedical is an Australian respiratory imaging company. Its CT:VQ platform uses existing CT scans to improve evaluating lung function amid diagnosing conditions. Since CT:VQ obtained US Food and Drug Administration (FDA) clearance in 2025, the company has secured deployments with six leading US academic medical centres. 

A bipartisan bill in the US directing the Department of Veterans Affairs to establish a pilot program using 4D functional lung imaging software to identify respiratory disorders and lung disease is an encouraging development. The company is well capitalised and we remain content holders at current levels given several potentially positive catalysts.

Rio Tinto Ltd (ASX: RIO)

Over at Fairmont Equities, its team thinks that Rio Tinto shares could be a buy this week.

The equities firm was pleased with Rio Tinto's performance during the first half and highlights that a recent pullback has created an attractive buying opportunity. It said:

Copper equivalent production was up 3 per cent in the first half of 2026 when compared to the prior corresponding period. Global iron ore sales in the second quarter were up 5 per cent year-on-year. Pilbara sales were up 7 per cent and lithium production rose 20 per cent. Results met or exceeded expectations of most analysts. 

A rare buy signal recently appeared on the daily relative strength index (RSI), which is a momentum indicator. The price pullback that started in June is mostly over and is transitioning to a more favourable risk/reward ratio, in my view.

SGH Ltd (ASX: SGH)

This diversified investment company has been named as a buy by the team at Baker Young this week.

Baker Young likes SGH due to its exposure to structural themes. It also believes there could be capital returns on the horizon for shareholders. It commented:

This diversified company has businesses across industrial services, energy and media. Continuing demand for mining and infrastructure construction underpin a positive outlook for the WesTrac, Coates Hire and Boral businesses. 

SGH also has a 30 per cent interest in Beach Energy. In our view, SGH is a high quality, long term cyclical stock supported by structural themes. Potential exists for capital returns, either via a dividend or buy-back, when it reports full year results in August.

The post Experts say 4DMedical, SGH, and Rio Tinto shares are buys appeared first on The Motley Fool Australia.

Motley Fool contributor James Mickleboro 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 Scott Phillips.

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