When the Chase Sapphire Reserve for Business card debuted, it was not available via referral. However, as reported by Doctor of Credit, it is now possible to refer a business to a Chase Sapphire Reserve for Business card from any existing Ink card.
When logging in to an existing Chase Ink card account and going to the “Refer a business” section, you will see new terms indicating that participating Chase for Business credit cards to which you can refer friends include:
Participating Chase for Business Credit Cards include: Chase Ink Business Unlimited®, Chase Ink Business Preferred®, Chase Ink Business Cash®, Chase Ink Business Premier℠, Chase Sapphire Reserve for Business.
That is good news for those with Ink cards who know business owners who may be interested in the Sapphire Reserve for Business. We are now seeing the Sapphire Reserve show up in the Ink referral links from all of the above cards (and even via referral from my old and no-longer-available Chase Ink Plus card).
Keep in mind that Chase is moving to new referral rules this fall under which you will only qualify for a referral bonus on Ink cards if the business you refer is not an existing Chase business credit card customer. Further, if ten or more friends use your referral link within a month to apply, Chase might not award any referral points at all. Check your referral terms carefully before sharing your link with a friend.

Is the sapphire reserve business available to referral from a personal sapphire reserve? When my friend sends me a referral link the sapphire reserve business shows up, but brings me to another page. Anyone know?