Meme stocks are in the news, so let's talk about one of the original meme stocks that has grown up for better or worse. With meme stocks in the news this week it's a good time to revisit a similar battleground investment that dominated the online discussion board chatter a generation ago. It's been nearly eight years since the monthly trading volume of Sirius XM Holdings (SIRI 1.11%) topped 1 billion shares, and a dozen years before that it was a hotly contested penny stock. The satellite radio provider has ...