I want to start my own directory website. Can I use informations from SEC.gov | Company Search Page and add to my website? Is it legal?
It most certainly is legal, although I don't see anything directly on the site regarding the specific search data. Most federal data (content for that matter) are automatically open when published by law. SEC's Open Gov Commitment (which actually seems like they stopped trying mid Obama's first term) doesn't name that dataset specifically, but would be safe to assume if the SEC is publishing it, it is fair game.