Peter Stephens owns shares of HSBC Holdings and Legal & General Group. The Motley Fool UK has recommended HSBC Holdings. 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. See all posts by Peter Stephens Enter Your Email Address Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! Simply click below to discover how you can take advantage of this. The stock market crash means that many FTSE 100 shares now trade on relatively attractive valuations. Certainly, some stocks have made encouraging gains of late as investor sentiment has improved. But in many cases there are large-cap shares trading on valuations that suggest they offer margins of safety.Here are two such examples of companies that appear to be undervalued at the present time. They may experience uncertain periods in the short run, but seem to have the potential to produce strong turnarounds in the long run. As such, buying them today could prove to be a shrewd move.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…FTSE 100 bank HSBCThe recent first quarter update released by FTSE 100 bank HSBC (LSE: HSBA) highlighted the financial impact that coronavirus is having on its performance. The bank experienced an increase in expected credit losses during the period, as well as impairments. This contributed to a 48% fall in its pre-tax profit for the quarter, with lockdown measures in many of its key markets likely to produce further declines in its financial prospects in the coming months.A slowdown in global economic activity could significantly impact on HSBC’s long-term prospects. However, investor sentiment towards the bank has substantially weakened over recent months. For example, its share price is currently down by 33% since the start of the year. This suggests that investors are factoring in a period of intense financial challenges for the bank, which could mean that it now offers an attractive risk/reward opportunity for new investors.With the bank being exposed to markets across the world that could offer relatively high growth rates in the coming years, it could experience a solid recovery. Therefore, now could be an opportune moment to buy a slice of it while it trades at a relatively low price following the FTSE 100’s recent market crash.Legal & GeneralThe recent investor update from FTSE 100 financial services business Legal & General (LSE: LGEN) highlighted its potential to deliver relatively strong growth in the long run. The company’s six structural growth drivers, which include areas such as an ageing population and climate change, continue to provide it with growth opportunities according to its update. As such, it intends to take advantage of low interest rates to take on debt to invest in its various divisions.While an uncertain economic outlook could cause investor sentiment towards Legal & General’s shares to decline, its current share price suggests that it offers a wide margin of safety. It is currently down 25% since the start of the year, which indicates that investors have priced in at least some of the risks faced across its business.Therefore, with the company appearing to have a solid balance sheet and a sound growth strategy, now could be the right time to buy a slice of it following the FTSE 100’s market crash. I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. “This Stock Could Be Like Buying Amazon in 1997” Peter Stephens | Friday, 5th June, 2020 | More on: HSBA LGEN Our 6 ‘Best Buys Now’ Shares Image source: Getty Images. Don’t waste the stock market crash! I’d buy these 2 cheap FTSE 100 shares right now I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee.