mercury systems, inc. and computershare trust company, n. a. as rights agent rights agreement dated as of december 27, 2021 i table of contents page section 1. certain definitions.................................................................................................... 1 section 2. appointment of rights agent................................................................................... 7 section 3. issue of rights certificates....................................................................................... 8 section 4. form of rights certificates....................................................................................... 9 section 5. countersignature and registration.....................................................................