This can be a mixed blessing. It allows founders and angels to achieve stylized arrangements that correspond to circumstances, and an angel`s terms can sometimes be easier to “digest.” Common shares are residual value shares of the same class issued to the founders of a start-up. Convertible preferred shares are shares that have a liquidation preference over common shares (with Engel transactions, usually the initial price of the investment) and can be converted into common shares of residual value. Sometimes you may find little difference between an angel or a Term Sheet investor seed and a Venture Capital Term Sheet. Both the investment structures required by engeln and the founding alliances are less limited by standardized institutional practices. There is no “set amount” for angel investors; Investments can range from a few thousand to a few million dollars. In 2010, the health/medicine sector accounted for the largest share of investment in the fisheries sector in 2010, in the event of a significant change from 2009. with 30% of total investment in the fishing sector (compared to 17% in 2009), followed by software (16% vs. 19% in 2007), biotech (15% vs.).
8% in 2009, industry/energy (8% vs. 17% in 2009), retail trade (5% vs. 8% in 2009) and IT services (5%).   Although more readily available than risk financing, Engel`s investments remain extremely difficult to increase.  However, new models are being developed to try to facilitate this task.  Geographically, Silicon Valley dominates U.S. angel investment and receives 39% of the $7.5 billion invested in U.S. companies in the second quarter of 2011, three to four times more than the total invested in New England.  Total investment was $22.5 billion in 2011, an increase of 12.1 per cent over 2010, when investments were $20.1 billion.
 In the United States, angels are generally accredited investors to comply with SEC rules, although the JOBS Act of 2012 relaxed these requirements from January 2013. With a target of nearly $23 billion in 2012 in the United States, Engel investors are not only responsible for financing more than 67,000 startups a year, but their capital has also contributed to job growth by helping finance 274,800 new jobs in 2012.  In 2013, 41% of technology industry leaders cited engel-investors as a means of financing.  There are many things you could do before you start looking for angel investors to make your business more attractive and avoid the obstacles below. Angel investors will almost certainly have made similar investments in the past and will generally instruct lawyers and accountants to check your books and records as part of their due diligence investigations of your business. Your business must be “ready to invest” before due diligence begins. As a result, your business will appear to be well managed and the investor will have more confidence in you and your business. These are a number of common problems that can be addressed before due diligence: the UK business angel market grew in 2009-10 and continues to show signs of growth despite recession-related concerns.   In 2013, this momentum continued in the United Kingdom, with Engel investors cited as financing by two-thirds of technology entrepreneurs.
 Until 2015, angel investment had increased across the UK, with the average number of angel investments being 5, up from 2.5 in 2009.