From SEC staff Memorandum: Figures 9B and 10B display daily counts of gross positions that surpass 7% and 10% of a U.S. listed security's market cap, respectively.

A single participant can hold multiple large positions, hence the count can exceed the total number of market participants...

Source: Memorandum from the Division of Economic and Risk Analysis

Look at how everything spikes in 2021... If you would like to comment about this, check out this post:

SEC REOPENS Comment Period for Position Reporting of Large Security-Based Swap Positions. The public comment period will remain open until Aug. 21, 2023, or until 30 days after the date of publication of the reopening release in the Federal Register, whichever is later.

Reddit Post