Do you have a source for this? According to opensecrets.org, they're in the top 2 for tech companies (their major rival is Comcast), but they spend much less than Blue Cross/Blue Shield or the National Association of Realtors. This has been true since at least 2010 (as far back as I checked).
They do sometimes spend more than Boeing, which I wouldn't have guessed.
They do sometimes spend more than Boeing, which I wouldn't have guessed.