I regularly get questions about how to handle punctuation when a sentence ends with a trademark symbol. Your answers await!
Trademark Symbols with Punctuation at the End of a Sentence
Trademark symbols go before the final punctuation:
Every morning, the first thing I do is check Google News™.
Do you love Grammar Girl®?
Sometimes professional designers play with the spacing so the period looks more like it is under the trademark symbol.
Trademark Symbols at the End of a Quotation.
Ending a quotation with a trademark symbol is unusual, and I recommend avoiding it if possible (see the section below), but if you must include a trademark symbol at the end of a quotation, put it before the terminal punctuation mark:
Al said, "I like Fritos®."
Guadalupe said, "I love playing Grammar Pop™!"
Trademark Symbol on Every Mention?
I'm not a lawyer, but in general, it is not necessary to use the trademark symbol every time you use a trademarked term, so you can often avoid using it when it looks awkward at the end of a sentence. This article from Forbes explains in more detail.
Related Article: Should I Capitalize "Google" When I Use It as a Verb?
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