Reddit to Join S&P 500 on Aug. 18, Replacing AvalonBay; Shares Rose About 16% on the News
S&P Dow Jones Indices said Reddit will enter the benchmark index before trading opens August 18, taking the slot of AvalonBay Communities, which is closing its merger with Equity Residential.
A Reddit-Sized Hole Opens in the S&P 500, and It's Not Because of Reddit
The S&P 500 is about to add a company built on message boards and cat memes. On the evening of Thursday, August 13, 2026, S&P Dow Jones Indices announced that Reddit Inc. would join the index before trading opens on Tuesday, August 18[1][2]. Reddit's stock jumped about 11% in after-hours trading that night, then rose another 15% to 16% during Friday's regular session[2][3].
Here's the part that gets buried under the stock-pop headlines: Reddit isn't replacing a weak company. It's replacing one that just finished a merger. AvalonBay Communities, an apartment landlord, is combining with Equity Residential in an all-stock deal that closes August 17[1][9]. Shareholders of both companies approved it on August 12[9]. The new combined firm, renamed Vivmark Residential, keeps its own seat in the S&P 500[10]. That left one seat open, and the index committee filled it with Reddit.
So the seat opened by accounting, not by combat. And yet Reddit's stock spiked like it had won something. Both of those things are true at once, and untangling why takes the rest of this story.
Why a Stock Jumps Before Anyone Actually Buys It
The mechanism is simpler than it looks, and it explains almost the entire price move. Index funds promise investors they'll hold exactly the stocks in the S&P 500, in the same proportions as the index itself. When S&P swaps a company in or out, every one of those funds has to trade to match, whether the price is a bargain or not[2].
Analysts estimate that requirement will force roughly 16.7 million Reddit shares' worth of buying[14]. Traders know the change is coming days in advance, so a lot of that buying pressure shows up in the stock price before the funds ever place an order. That's why index inclusion reliably makes a stock jump. It isn't proof the company suddenly got better at its job.
That distinction matters here more than usual, because Reddit's underlying story is genuinely mixed. The company's second-quarter revenue came in at $804.9 million, up 61% from a year earlier, with earnings of $1.25 a share against a Wall Street estimate of $0.97[5][6]. Those are strong numbers by any measure.
But when Reddit reported those very results on July 30, its stock fell 21% in the days that followed[6]. By early August, before this week's index news, Reddit shares were down 38.8% for the year, according to Zacks Investment Research[6]. A profitable quarter and a falling stock happened at the same time. That's the real puzzle at the center of this story.
The Traffic Problem Hiding Inside the Earnings Beat
The answer sits in one line from Reddit's own investor letter: search referrals were "choppy[7]." To understand why that phrase spooked investors more than the revenue number reassured them, you have to know how Reddit actually gets its readers.
A large share of people who land on Reddit arrive by clicking a link from a Google search. That's the referral. Google, in turn, has been rolling out AI-written summaries that sit at the top of search results and answer a user's question directly on the search page. If the summary answers the question, fewer people click through to Reddit itself. Fewer clicks means fewer ads shown, which means less revenue, even if Reddit's content was the source material for the AI's answer.
The numbers show the strain. Reddit's U.S. daily active users slipped from 53.5 million in the first quarter of 2026 to 53.2 million in the second[7]. That's a small dip, but U.S. users are the ones advertisers pay the most to reach, so even a small U.S. slide worries investors more than the headline growth number suggests. Globally, daily users actually rose 18% to 130.3 million, with international users up 28%[7][13]. Growth is real, but it's increasingly happening in markets that generate less ad revenue per user than the U.S. does.
Here's the twist that makes this more than a simple traffic story: Google is also paying Reddit for its content. Reddit has struck licensing deals worth roughly $70 million a year with OpenAI and about $60 million a year with Google, so AI companies can train their models on Reddit's archive of human conversation[3][15]. Reddit is being paid by the same companies whose products may be quietly cutting into its traffic. That's not a contradiction either side invented — it's a structural squeeze built into how Reddit now makes money.
Two Honest Ways to Read the Same Balance Sheet
Reddit's supporters have a straightforward case. The company has been profitable in nearly every quarter since its 2024 initial public offering, and that kind of consistent profitability is exactly what index committees look for when picking new members[4]. Revenue per international user climbed 36% in the most recent quarter, which backers argue shows Reddit is successfully turning its global growth into money, not just headcount[13]. In this telling, Reddit has graduated from an internet novelty into a durable, profitable business, and the S&P 500 seat simply confirms what the numbers already showed.
Skeptics read the same figures and see a company whose core growth engine is jammed. They point to the 21% stock drop right after Reddit beat earnings estimates as the clearest signal: investors weren't questioning the quarter that just happened, they were questioning whether Reddit can keep adding the users it needs for the next one[6]. One widely shared piece from 24/7 Wall St. put the skeptical case bluntly in its headline: Reddit is joining the index, but that doesn't mean it's a buy[8]. Their argument isn't that Reddit lied about its numbers. It's that a single quarter's profit doesn't resolve the search-traffic question hanging over the business.
Both readings can be true simultaneously, and that's the point. Reddit really did post $805 million in quarterly revenue, up 61% in a year, with a 43% adjusted profit margin on that measure[5][13]. Reddit's stock really did fall nearly 39% this year before this week's news[6]. The index committee isn't required to referee that dispute. Its rules ask for adequate size, tradability, and a record of positive earnings, and Reddit cleared those bars from an eligible pool of candidates[4].
What AvalonBay Loses and What Nobody Is Fighting Over
It's worth pausing on the side of this story that gets the least attention: AvalonBay and Equity Residential aren't losing anything they didn't choose. Their shareholders voted for the merger. The combined company, Vivmark Residential, stays in the S&P 500 under its new name[9][10]. From their perspective, a real estate deal closed on schedule, and a media cycle about a social media company happened to attach itself to their news.
S&P Dow Jones Indices, for its part, has consistently maintained it isn't picking winners, just keeping the index current with a fixed set of published standards, and it has previously and publicly denied that companies can buy or lobby their way onto the list[4][12]. That defense matters because every index change moves prices before a single index fund actually trades, which invites the very suspicion S&P is trying to head off.
Coverage of the story split along fairly predictable lines. The Associated Press and CNBC led with the stock jump and treated the AvalonBay merger as a secondary detail, even though it's the actual reason the seat opened[2][4]. Forbes paired the price jump with Reddit's AI licensing deals in a growth-story frame, giving less space to the year-to-date decline[3]. StockStory's earnings analysis went the other direction, centering the U.S. user dip and the "choppy" referral language as the strongest bearish evidence available[7]. A Canada-based investor site, NAI 500, framed the whole event around OpenAI CEO Sam Altman's personal stake in Reddit, turning an index-maintenance story into a tale about insider gains[11].
The Question the Index Seat Doesn't Answer
On August 18, every fund that tracks the S&P 500 will own Reddit stock, whether or not the search-traffic question has been settled by then. That's the mechanical reality behind this week's headlines. It changes who holds the shares. It says nothing about how many people will actually show up at reddit.com that morning.
Reddit's central bet is that its archive of human conversation stays valuable to AI companies even as those same companies' tools change how people find information in the first place. Whether that bet pays off won't show up in an index announcement. It'll show up in the next few quarters of user numbers, the ones investors were already watching closely before S&P ever got involved.
Summary
S&P Dow Jones Indices announced that Reddit Inc. will join the S&P 500 stock index before trading opens on Tuesday, August 18[1]. Reddit takes the spot held by AvalonBay Communities, an apartment landlord[1]. AvalonBay is leaving for a mechanical reason, not a poor one. It is merging with Equity Residential, and shareholders of both companies approved the deal on August 12[9]. The merged company will be called Vivmark Residential and will stay in the index[10]. That left one open seat, and the index committee gave it to Reddit.
Reddit shares rose sharply. The stock gained about 11% in after-hours trading on Thursday, August 13, then rose 15% to 16% during Friday's regular session[2][3]. Part of that move is automatic. Index funds promise to hold exactly the stocks in the index, so when membership changes, they have to buy. One estimate put the forced buying at roughly 16.7 million Reddit shares[14].
The genuine dispute is about what the jump means. Supporters say Reddit earned the seat. The company posted about $805 million in second-quarter revenue, up 61% from a year earlier, and has been profitable in nearly every quarter since going public in 2024[4][5]. Skeptics say the index move is a one-time mechanical event that does not fix the business problem underneath. Reddit's stock had fallen 38.8% year to date before this week, by one tally from Zacks in early August[6]. Its U.S. daily users slipped from 53.5 million to 53.2 million between the first and second quarters[7]. Reddit itself told investors that search referrals were "choppy"[7].
That last point is the crux. Reddit depends on Google sending it visitors. Google's AI-written answer summaries increasingly answer a user's question on the search page itself. If fewer people click through to Reddit, Reddit shows fewer ads — even as it collects licensing fees from the same AI companies whose products may be reducing its traffic[7][15].
The Event
On the evening of Thursday, August 13, 2026, S&P Dow Jones Indices announced that Reddit Inc. (NYSE: RDDT) will join the S&P 500 index before the opening of trading on Tuesday, August 18, 2026[1][2]. Reddit replaces AvalonBay Communities Inc. (NYSE: AVB), which is merging with Equity Residential in an all-stock merger of equals set to close August 17[1][9]. Sun Communities was named in the same release as moving to the S&P MidCap 400[1]. Reddit shares rose about 11% in extended trading Thursday and 15% to 16% in Friday's session[2][3].
Undisputed Facts
- S&P Dow Jones Indices said Reddit will enter the S&P 500 before trading opens on Tuesday, August 18, 2026[1].
- Reddit takes the index slot of AvalonBay Communities, which is merging with Equity Residential in an all-stock merger of equals[1][9].
- AvalonBay and Equity Residential shareholders approved all merger proposals on August 12, 2026; the combined company is to be renamed Vivmark Residential and remain in the S&P 500[9][10].
- Reddit shares rose roughly 11% in after-hours trading August 13 and 15% to 16% in the following regular session[2][3].
- Reddit reported second-quarter 2026 revenue of $804.9 million, up 61% year over year, and diluted earnings of $1.25 a share, above the $0.97 analysts expected[5][6].
- Reddit's global daily active unique users rose 18% year over year to 130.3 million in the quarter, while U.S. daily active users fell from 53.5 million in the first quarter to 53.2 million in the second[7][13].
- Reddit shares fell about 21% in the days after its July 30, 2026 earnings report, and Zacks reported the stock down 38.8% year to date as of early August, before the index announcement[6].
- Reddit has paid data-licensing agreements with OpenAI, reported at about $70 million a year, and with Google, reported at about $60 million a year[3][15].
The Pressure
Strip away the moralizing and blame. What structural realities persist regardless of which narrative wins?
- Passive funds must trade, whatever the price
- An index fund's promise is to match the index, not to buy cheap. When S&P changes a member, every tracking fund has to buy the newcomer and sell the departer close to the effective date. Estimated forced buying here was about 16.7 million Reddit shares[14]. Traders know the date in advance, so much of the price move happens before the funds trade. This is why index additions reliably pop and why that pop is not evidence about the business.
- The seat opened by merger, not by merit
- AvalonBay is leaving the index because it is merging into Equity Residential, with the combined Vivmark Residential keeping a place in the S&P 500[9][10]. The committee had to fill a vacancy on a fixed schedule. Reddit was chosen from an eligible pool; it did not displace a struggling company.
- Reddit's traffic depends on a company that is also its customer
- Google sends Reddit a large share of its logged-out visitors. Google also pays Reddit roughly $60 million a year to license Reddit content, and uses AI-written summaries that answer questions on the search page[3][15]. That creates a squeeze: the licensing revenue is real cash today, while the summaries can reduce the clicks that generate ad revenue tomorrow. Reddit's investor letter described search referrals as "choppy"[7].
- Growth is shifting outside the United States
- Global daily users rose 18% to 130.3 million, with international users up 28%, while U.S. daily users slipped from 53.5 million to 53.2 million[7][13]. U.S. users are worth far more per head to advertisers. So a rising global count and a flat U.S. count are not interchangeable good news.
Material realityTwo things are true at once and neither cancels the other. Reddit is a profitable, fast-growing company: about $805 million in quarterly revenue, up 61% in a year, with earnings well above forecasts and a 43% adjusted profit margin on that measure[5][13]. And Reddit's stock had fallen 38.8% year to date as of early August, with a 21% drop in the days after those same strong results[6]. The market is not disputing the current numbers. It is pricing the risk that Reddit's audience pipeline — Google search — is narrowing. The index addition changes who owns the shares. It does not change how many people arrive at reddit.com each morning. On August 18, index funds will own Reddit whether or not that question is resolved.
Narrative as a weaponThree groups are shaping how this reads. Reddit and its investors want the index seat read as validation — proof the company has graduated from meme stock to blue chip — because that framing supports the share price and recruits long-term holders. Financial media has a structural pull toward the same story, because "stock surges" is a cleaner headline than "real-estate merger creates index vacancy," which is the more accurate description of what happened. Skeptics, including short sellers and subscription research sites, want you to read the pop as mechanical and temporary, and they point to the 21% post-earnings drop and the U.S. user dip as the signal that matters. S&P Dow Jones Indices wants you to believe it made no judgment at all — that it simply filled a seat by published rules — because any suspicion that inclusion is discretionary or purchasable threatens the value of the benchmark itself[12]. The one framing no one is pushing hard, because it sells nothing, is the boring one: a scheduled index maintenance event happened to a company whose central business question remains open.
How Each Side Sees It
Each major actor’s view — how it frames things, its underlying incentive, and how it’s materially affected. Tap a side to read it.
Frames it asReddit's case is that the index seat confirms a business that has already grown up. Revenue reached about $805 million in the second quarter, up 61% in a year[5]. The company has turned a profit in nearly every quarter since its 2024 IPO — and steady profitability is one of the things the index committee looks for[4]. Management also argues the user picture is better than the U.S. number suggests: global daily users rose 18% to 130.3 million, with international users up 28% and revenue per user up 36%[13]. The strongest version of Reddit's argument is that it is no longer an ad-only business. Its archive of human conversation is a scarce input for AI training, and companies are paying cash for it[3][15].
WhyReddit wants to be repriced as durable infrastructure rather than a fad forum. Index membership brings permanent, price-insensitive buyers and cheaper access to capital, and it helps employee stock compensation hold value after a year in which the stock fell sharply[6].
Impact on themIndex funds must buy the stock, estimated at roughly 16.7 million shares[14]. That is a one-time demand shock, not recurring revenue. The underlying pressure — flat U.S. users and unstable search referrals — is unchanged by the index listing[7].
Frames it asS&P's position is that it is a scorekeeper, not a stock picker. Its job is to keep the index a representative snapshot of large U.S. companies. When a member disappears through a merger, the seat must be refilled promptly or the index stops matching the market it measures. The committee applies published standards — U.S. domicile, adequate size and tradability, and a record of positive earnings — and picks from companies that clear them[4]. S&P has previously and publicly rejected the suggestion that inclusion can be bought or lobbied for[12].
WhyS&P earns licensing fees from the trillions of dollars benchmarked to its indexes. Its product is credibility. A committee seen as arbitrary or purchasable would damage the franchise far more than any single addition could help it.
Impact on themEvery addition invites scrutiny of the committee's discretion, because the announcement itself moves prices before any fund trades. That price move is the reason critics call the process consequential rather than neutral[12].
Frames it asThe skeptics' argument is that the pop is a transfer, not a discovery. Index funds are legally bound to track the benchmark, so they buy at whatever price exists on the day — including a price that rose 16% precisely because everyone knew they had to buy[2][3]. That is money out of ordinary retirement savers' pockets and into the hands of traders who front-ran the change. Their second argument is about substance: the earnings that beat estimates were followed by a 21% drop, because investors care about whether Reddit can keep getting new users, not about one quarter's profit[6]. One widely circulated take put it bluntly — Reddit is being added to the S&P 500, but you still should not buy it[8].
WhyFund managers want to minimize the hidden cost of rebalancing. Active managers and short sellers want to show that mechanical index buying creates mispricing they can exploit.
Impact on themAnyone holding a standard S&P 500 index fund now owns Reddit automatically, at a price set partly by the announcement itself. If Reddit's traffic problem worsens, that exposure was not chosen by the saver.
Frames it asThe apartment landlords' view is that nothing bad happened to them. Their shareholders voted on August 12 to combine two large apartment owners into one company with more scale, and the merged firm keeps its S&P 500 membership under the Vivmark Residential name[9][10]. In their telling, the Reddit headline borrowed their news: the seat opened because a real-estate deal closed on schedule, not because a landlord was pushed out for a social media company.
WhyBoth companies want the merger read as a strengthening deal, not as an exit. Keeping index membership for the combined entity preserves the same passive-fund ownership base.
Impact on themAvalonBay's separate ticker disappears from the index on August 18[1]. Funds must sell AvalonBay shares as they buy Reddit — the mirror image of the Reddit trade.
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The Bias Ledger average rating 4
The same story, as framed by outlets across the spectrum, ordered least to most biased. The bias score (1 = straight, 10 = heavily spun) is an AI assessment of that framing — click an outlet to see its track record. The tell is the word choice or omission that reveals the angle.
| Outlet | Vantage | Bias | How they frame it | The tell |
|---|---|---|---|---|
| Associated Press | U.S. center | 2 | "Online forum Reddit will join the influential and closely tracked S&P 500 index" — plain event reporting, with context on Reddit's profitability and what index membership means for fund buying[4]. | The word "prestige" does light editorial work, and the piece leads with Reddit's rise while treating the AvalonBay merger — the actual reason a seat opened — as a secondary detail. |
| CNBC | U.S. center, business press | 2 | "Reddit stock jumps on inclusion in S&P 500" — price move first, mechanism second[2]. | Frames the story through the share price rather than the index change. It explains that funds must buy, which is the honest mechanism, but the headline still reads as a win for the company rather than a rebalancing event. |
| Forbes | U.S. center-right, business | 3 | "Reddit Shares Jump 15% As It Joins The S&P 500 Next Week—Here's What To Know"[3]. | Explainer framing aimed at retail investors. Pairs the jump with the AI licensing deals, which reads as a growth story; the year-to-date decline gets less prominence than the one-day gain. |
| StockStory | U.S. quantitative equity research site | 4 | "Monetization Growth Outpaces User Expansion Amid Search Headwinds" — frames the quarter as good money, weak audience[7]. | The most skeptical honest framing available. It centers the sequential U.S. user decline and the "choppy" search referrals, which is the strongest bear evidence, but it treats a single quarter's user dip as a trend without saying so. |
| 24/7 Wall St. | U.S. retail-investor commentary, subscription-driven | 6 | "Reddit Is Getting Added to the S&P 500 — But You Still Shouldn't Buy It"[8]. | Openly a recommendation, not reporting. The "but" construction sets up index inclusion as a trap for naive buyers, which is a real argument — though the piece leans on the stock's decline while giving the 61% revenue growth much less space. |
| NAI 500 | Small investor-marketing site, Canada-based | 7 | "Reddit Joins S&P 500 — and Sam Altman Reaps Windfall"[11]. | Reframes an index rebalancing as a story about a wealthy individual's gain. Altman's Reddit stake is real and his company OpenAI is a Reddit licensing customer, so the conflict angle is legitimate — but leading with the personality converts a mechanical market event into a narrative about insiders cashing in. |
References
- Reddit Set to Join S&P 500 and Sun Communities to Join S&P MidCap 400 — StockTitan · Aggregator republishing the S&P Dow Jones Indices press release verbatim; no editorial stance
- Reddit stock jumps on inclusion in S&P 500 — CNBC · U.S. business news, owned by Comcast/NBCUniversal; market-participant audience
- Reddit Shares Jump 15% As It Joins The S&P 500 Next Week—Here's What To Know — Forbes · U.S. business magazine, center-right on economics; contributor-heavy model
- Online Forum Reddit Will Join the Influential and Closely Tracked S&P 500 Index — Associated Press · U.S. nonprofit news cooperative funded by member outlets; wire-service house style
- Reddit (RDDT) Q2 2026 earnings report — CNBC · U.S. business news, owned by Comcast/NBCUniversal
- Reddit Plunges 21% Post Q2 Earnings: Buy, Sell, or Hold the Stock? — Zacks Investment Research · For-profit U.S. equity research firm selling stock-ranking subscriptions; bullish/bearish calls are its product
- RDDT Q2 Deep Dive: Monetization Growth Outpaces User Expansion Amid Search Headwinds — StockStory · U.S. quantitative equity research site, subscription-funded; systematically skeptical framing
- Reddit Is Getting Added to the S&P 500 - But You Still Shouldn't Buy It — 24/7 Wall St. · U.S. retail-investor commentary site, ad- and subscription-funded; explicitly opinionated stock calls
- AvalonBay Shareholders Approve Merger with Equity Residential — TipRanks · Investment-data platform republishing company announcements; no political stance
- Equity Residential Shareholders Approve Transformative AvalonBay Merger — Equity Residential · Company press release — the merging party's own account
- Reddit Joins S&P 500 — and Sam Altman Reaps Windfall — NAI 500 · Small Canada-based investor-marketing and IR content site; traffic-driven headlines
- S&P denies allegations it sells index inclusion — Axios · U.S. center, business/politics newsletter model; note this piece predates the Reddit addition and concerns index-committee discretion generally
- RDDT Q2 2026 Earnings Call: Reddit Tops $800M Revenue, Profit Doubles, But U.S. User Slip Stokes Growth Fears — BigGo Finance · Asia-based finance aggregator summarizing earnings calls; algorithmic/low-editorial
- Reddit Joins the S&P 500 Next Week, Forcing Index Funds to Buy Its Stock — Startup Fortune · Small startup-focused trade blog, ad-supported; share-count estimate is its own and not from S&P
- Reddit Secures S&P 500 Entry, Capping a Turbulent Stretch Marked by AI Legal Battles and Shifting Analyst Views — ad-hoc-news · German financial-news aggregator carrying syndicated market commentary