The UK's membership fee in 2018 according to full fact goes from a £17bn gross payment, less rebate and public sector spending to a £9bn net payment.
Specifically, this image shows this does not include Private Sector payments. A link in the article to a UK government report shows a further £2.3bn is paid directly to private concerns.
The EU makes some payments directly to the private sector, for example to carry out research activities. These payments do not appear in public sector accounts. It is estimated that in 2016 these receipts were worth £2.3 billion (see Technical Annex B). These payments are not included in Table 3.A or Tables 3.C-F, which provide data only on receipts channelled through the public sector.
However, I've been unable to find any breakdown of these monies. Who in the Private Sector receives the £2.3bn from EU?