Many firms offer officers and key employees opportunities to buy company stock at a discount. Money is withheld from paychecks and periodically like quarterly or semi-annually, company stock is bought for the employee at a discount, say 15% for example. This would be an indirect purchase. Bonuses to top officers also may be paid in the form of stock shares which would be indirect purchases. Whenever you see a number of insider buys taking place on the same date, disregard the buying as it was done as part of a discount stock purchase plan. At a firm I once worked for, many employees participated int the employee stock purchase program for the discount, but then sold the shares as early as the rules permitted. A direct purchase is when a company insider actually calls his/her broker and buys stock.
So Wilbur's purchase is not as meaningful in this scenarario.
Could it also be when for example I want to purchase shares @ P&G and instead of going through a broker, I call the company and purchase shares directly from them? Some public companies allow that but I'm not sure if you get the paper when you purchase from the company but if you do want the paper from a broker, you have to say you want the certificate of purchase.