Reddit Joins the S&P 500 Next Week, Forcing Index Funds to Buy Its Stock

Reddit is joining the S&P 500 before the market opens on Tuesday, August 18, 2026, but the index win only tells you half the story.

S&P Dow Jones Indices said Reddit will replace AvalonBay Communities in the S&P 500 as AvalonBay combines with Equity Residential into Vivmark Residential. Reddit is in. AvalonBay is out. Barron's noted that Reddit shares climbed as much as 15% after the announcement, while other market reports put the move near 14% in Friday trading. The stock moved first because the market knows what happens next.

The buyer is obvious. Funds that track the S&P 500 have to own the companies in it, and they don't get to skip Reddit because the stock is volatile or because the business still makes some investors nervous. That buying starts now. You can call it passive investing, but there is nothing passive about the pressure it can put on a newly added stock over a few trading days.

This is not subtle.

Reddit priced its March 2024 IPO at $34 a share, after years of being treated as a messy internet forum with a loyal user base and an uncertain public-market case. Two years later, it's being pulled into the benchmark index that sits inside 401(k)s, pension portfolios, mutual funds and ETFs across the country. Frankly, that is the better story than the one-day stock pop. Reddit did not become easier to understand overnight. It became harder to ignore.

The Business Finally Cleared The Bar

Reddit's second-quarter numbers explain why S&P Dow Jones Indices could make the move without treating it like a meme-stock favor. Reddit reported revenue of $805 million for the quarter ended June 30, up 61% from a year earlier, and diluted earnings per share of $1.25. Advertising revenue rose 64% to $762 million. The company also guided third-quarter revenue to $860 million to $870 million.

That matters. S&P 500 inclusion isn't a popularity contest, even if the market often behaves as if it is. The index has profitability, liquidity and market-size requirements, and Reddit has now built enough of an earnings record to get through the door. You do not have to love the stock to see the change. A company that went public with a cult following and plenty of skepticism now has numbers that large index committees can use.

Reuters reported after Reddit's July results that choppy search-engine referrals weighed on U.S. user growth, even as the company beat revenue expectations. That is the awkward part of the business. Reddit is selling advertisers access to communities built on real user intent, but a lot of those users still arrive through Google. If Google's AI summaries answer more questions on the search page, fewer people may need to click through to Reddit in the first place.

CEO Steve Huffman put the problem more cleanly in Reddit's shareholder letter, saying search referrals were choppy but the commercial business remained strong. You should read both halves of that sentence. The ad machine is working. The traffic pipe is less predictable than investors would like.

The Google Fight Is The Real Test

The Wall Street Journal reported in July that Reddit had discussed whether to limit Google's access to its content as the companies negotiated around AI use. The existing Google data-licensing deal has been widely reported at about $60 million a year, signed in 2024, and a Yahoo Finance report citing Wells Fargo put the possible value of renewed AI data deals at about $550 million.

That is the risk. Reddit's archive is valuable because it is messy, current and human. AI companies want that because generic training data runs out of use quickly. But if Reddit squeezes Google too hard, it could hurt the same search channel that sends people into its communities. If it gives Google too much, it risks helping AI products answer Reddit-like questions without sending users back.

You can see why investors keep swinging between excitement and fear. Reddit's stock remains down sharply for the year, even after the S&P 500 announcement, according to MarketWatch. That is not how a settled story trades. It is how a stock trades when the market can see both the prize and the trap.

Reddit's index promotion also says something about the 2024 IPO class. Astera Labs, Rubrik and other high-profile listings from that window are still proving how much of their first public-market enthusiasm can become durable earnings. Reddit just reached a marker they all want. It did it through ad growth, cost discipline and a data business that now sits at the center of the AI search fight.

The S&P 500 seat will force ownership. It will not force conviction. That still depends on whether Reddit can turn its communities into a stronger advertising and licensing business without letting Google, OpenAI, or any other AI company drain the value from the front door.

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