Whats going on with the S4 Capital share price?
Its been a great 2021 for the S4 Capital (LSE: SFOR) share price. The stock is up over 30% and has increased more than 110% during the past year. Of course, previous performance isnt an indication of future returns. Well, for now Ill just be watching the share price. I think the company has lots of potential, but Im not ready to dip my toe in just yet. 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 well show you something that could be key to unlocking 5Gs full potential... The firm  S4 Capital was established by Sir Martin Sorrell in May 2018. This founder is a key figure in the world of marketing. After all, he was the brains behind WPP, the FTSE 100 advertising and PR group. But he left and used his own money as well as some from investors to set up S4 Capital. Since then, the firm has been growing at a staggering rate. Last year, revenue increased by 59% to 343m compared to 215m in 2019. Profitability has been improving too. It went from a loss of 9m to a profit before income tax in 2020 of 3m. So things are moving rapidly and I could be looking at a much larger firm in the companys next financial year. It even describes itself as going from peanut to a unicorn in a short period of time. S4 Capital currently has a market cap of almost 4bn. Thats pretty good going in three years. But it always helps when theres a high-profile founder involved. The founder  Speaking of Sorrell, theres no denying he has so far done a great job. Im certainly not dismissing this. But I question whether the firm would have any credibility without him. It seems to me that the key to growth is Sorrell himself, which adds an element of key-person risk. While hes the Executive Chairman of the company, hes also 76 years of age. Sorrell does have a 10% stake in the firm so he has skin in the game. But maybe hell decide one day to sail off into the sunset. At present, I cant help but feel that S4 Capital is very reliant on him. S4 clients  Over 70% of the firms gross profits come from The Americas. And 55% of last years revenue came from tech clients. My concern is that revenue seems to be concentrated among just few customers. If the tech sector is hit, then marketing budgets could get slashed, which could impact the S4 Capital share price. The company is working to widen it customer list. So far it has what the company calls five whopper clients secured or in sight. But its goal is to have 20 customers generating over $20m in revenue each. It continues to build relationships with the likes of Google, Facebook, Amazon and Netflix. And it has secured business from companies such as PayPal and Shopify. I like that S4 Capital has clear and ambitious goals to grow. Of course, this will take time. But the client concentration so far, makes me a little uneasy. I like what S4 Capital is doing and the strong growth is appealing. But the share price is close to its all-time high and is likely to be sensitive to negative news. For now, Ill only add the stock to my watchlist.