See all posts by Matthew Dumigan Simply click below to discover how you can take advantage of this. Image source: Getty Images Enter Your Email Address Get the full details on this £5 stock now – while your report is free. Our 6 ‘Best Buys Now’ Shares Are you on the lookout for UK growth stocks?If so, get this FREE no-strings report now.While it’s available: you’ll discover what we think is a top growth stock for the decade ahead.And the performance of this company really is stunning.In 2019, it returned £150million to shareholders through buybacks and dividends.We believe its financial position is about as solid as anything we’ve seen.Since 2016, annual revenues increased 31%In March 2020, one of its senior directors LOADED UP on 25,000 shares – a position worth £90,259Operating cash flow is up 47%. (Even its operating margins are rising every year!)Quite simply, we believe it’s a fantastic Foolish growth pick.What’s more, it deserves your attention today.So please don’t wait another moment. Speaking of the best shares to buy in the case of a 2021 stock market rally, take a look at this top pick from The Motley Fool’s analysts… Matthew Dumigan | Saturday, 30th January, 2021 | More on: CCC CMCX FREE REPORT: Why this £5 stock could be set to surge 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. 2 of the best UK shares I’d buy for the 2021 stock market rally Matthew Dumigan has no position in any of 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. The year ahead promises to be an interesting one for the stock market. While many analysts remain concerned about an imminent sell-off, others are far more optimistic. Some even believe we could be in for a strong stock market rally.Either way, I’ll be keeping my eye on a handful of shares throughout 2021 to determine whether they represent worthwhile investments. Today, I’ll discuss two that I think are among the best to buy for my portfolio in coming year.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…An exciting UK tech stockMultinational IT infrastructure services company Computacenter (LSE: CCC) has expanded rapidly over the previous five years. Earnings growth has been outstanding, which is an indicator of a growth stock with solid potential.Such growth has been reflected in its meteoric share price rise, which now stands around 195% higher than it was in 2016. That figure represents an annualised return of around 39%, well outperforming the FTSE 250 index.Last year’s lockdown restrictions caused a boom in business for the IT firm, which saw revenues and profits rise substantially. In fact, in a recently released trading statement, the company reported an 8% increase in group revenue.That said, it won’t be straightforward for the company to carry this momentum moving forward. Furthermore, the shares are on the expensive side, with a price-to-earnings ratio (P/E) of around 26.However, the company’s essential IT services are in demand by businesses across the globe. What’s more, Computacenter has capitalised on this by completing recent acquisitions in the US and France.With that in mind, I rate Computacenter shares a buy for my portfolio. To me, the company’s growth potential amply justifies the hefty price tag.Making the most of market volatilityThe second UK share I’m considering is CMC Markets (LSE: CMCX). I think the provider of online and mobile trading services has performed exceptionally over recent years and could profit handsomely from a stock market rally in 2021.Like Computacenter, CMC has witnessed its valuation skyrocket, rising by 231% in just two years. Despite this, the company’s shares trade on a forward P/E ratio of 13, which indicates an element of value in my eyes.Last year, the company posted record first-half results as the Covid-19 pandemic boosted activity. What’s more, this strong trading performance shows no sign of letting up anytime soon. Last week, the online trading platform highlighted that full-year net operating income is set reach the upper end of market forecasts thanks to a continued strong performance.However, CMC’s continued success will rely on attracting and retaining a high level of both retail and institutional clients, which could prove to be unachievable.Nevertheless, CEO Peter Cruddas has stated that the company has a healthy range of projects in the pipeline, which could provide a catalyst for further growth in 2021 and beyond. As such, regardless of whether the stock market rallies this year, I’m confident CMC shares could provide a neat return. With that in mind, I’d buy and hold for the long term.