LobbyFacts uses data from the official EU lobby register and unfortunately the data in the register is not reliable enough to provide total figures for the amount spent on lobbying or the total number of lobbyists active in Brussels.
For example, if you look at the Statistics page, and sort entries by spending, you will see some huge declared spends from registrants that you have never heard of, indicating that they have either mistakenly declared their turnover (not lobby spend) or made a mistake inputting the figures. Additionally, other organisations may well be under-estimating their lobby spend (to try to appear less active than they really are). There is also an issue with double-counting in that both those who employ intermediaries (law firms or lobby consultancies) to carry out their lobbying, and the intermediaries themselves, should declare that lobby spend.
For the total number of lobbyists, the figures in the EU lobby register are also too unreliable for LobbyFacts to produce a total. The figures for total number of lobbyists (which relates to numbers of individuals lobbying) and the total number of fulltime equivalent (FTE) lobbyists, are both self-declared figures which means that they are also subject to over- or under-reporting. For example, if you add up the the total number of FTE lobbyists declared, you will reach a figure of about 45,000. But this is not robust: the top 20 biggest lobbyist declarers alone report that they have 14,000+ lobbyists between them, which is clearly ludicrous. Too many organisations mistakenly declare their total staff numbers or total membership numbers, instead of their total lobbyist numbers. Meanwhile, the number of European Parliament passholders is a reliable figure (it is not self-declared, but instead comes direct from the Parliament's records) and reveals that there are over 6000 passholders. But this is not an accurate indicator of total lobbyist numbers, only of how many EP lobby passes have been issued. Many other lobbyists are active in Brussels, including around the Commission, but without holding an access pass. Therefore, EP passes also do not reflect total lobbyist numbers.
These are some of the reasons why LobbyFacts does not provide any figures for either total spend on EU lobbying, or for total lobbyist numbers. Notwithstanding this, if you perform a search on the Statistics page, click to download the search into a file, you can calculate the declared lobby spend total or the total declared lobbyist numbers for that particular dataset.