NEW YORK—Reddit will enter the S&P 500 before the opening bell on Aug. 18, S&P Dow Jones Indices announced, replacing AvalonBay Communities. Shares rose 12 percent to $177.74 in premarket trading Friday—a sharp bounce for a stock that has shed 31 percent year-to-date.
The seat opens because Equity Residential is acquiring AvalonBay, one of the largest owners of multifamily residential properties in the United States. Index rules require a departing member to be replaced, and S&P Dow Jones Indices selected Reddit as the substitute.
Reddit becomes the second pure-play social media company in the S&P 500, joining Meta Platforms. Every other social-adjacent name in the index—Alphabet, Amazon, Apple—generates the bulk of its revenue from segments well beyond social feeds. Reddit's entire business runs on user-generated content and the advertising dollars that flow from it.
The same announcement added Sun Communities to the S&P MidCap 400 on Aug. 20, where it will take the slot vacated by Webster Financial. Webster is leaving the index because Banco Santander's planned acquisition will remove it from independent trading.
The 12 percent rally arrives at an awkward moment for Reddit's chart. The stock fell more than 20 percent in the session following its most recent earnings report, as investors fixated on slowing U.S. user growth and uncertainty around search-driven traffic even though the underlying financials beat expectations across every major line item.
Revenue for the most recently reported quarter came in at $805 million, a 61 percent increase year-over-year and well above the analyst consensus of roughly $730 million. Net income rose to $253 million from $89 million in the same period a year earlier. Advertising revenue—Reddit's dominant revenue stream—grew 64 percent to $762 million. Daily active users reached 130 million, up 18 percent.
For the third quarter, Reddit guided revenue of $860 million to $870 million, ahead of what analysts had forecast. The concern pulling against those numbers: U.S. user growth has decelerated, and the company's dependence on search-engine-driven traffic leaves it exposed to algorithm changes at Google and other platforms.
Index inclusion carries a mechanical demand driver. Passive funds—index mutual funds and ETFs benchmarked to the S&P 500—must hold every constituent in proportion to its weight. When a new stock enters the index, those funds buy shares to match the benchmark, creating forced demand ahead of and around the effective date. The size of that buying depends on Reddit's market cap relative to the full index.
That forced buying is real, but the index effect has moderated over time as more capital has anticipated inclusion events in advance. The 12 percent move in premarket trading suggests a portion of that anticipated buying is already priced in before Aug. 18 arrives.
At $177.74, the stock remains 31 percent below where it started the year. The 20-percent-plus post-earnings drop came despite revenue and earnings that outpaced Wall Street's estimates on every key metric—advertising revenue, net income and daily active users all came in ahead of consensus. The disconnect between fundamentals and price action reflects investor skepticism about whether Reddit can sustain growth as search algorithm shifts reduce referral traffic.
The advertising revenue figure deserves attention. At $762 million out of $805 million total—roughly 95 percent of the top line—Reddit's financials are almost entirely a function of ad pricing and volume. That concentration means any deterioration in digital advertising demand, or any platform change that reduces page views, flows almost directly to the bottom line.
Meta Platforms, Reddit's only peer as a pure-play social name in the S&P 500, traded at $594.97 on Thursday, up 2.8 percent on the session. Index fund managers now hold both names in the same benchmark—Meta's scale dwarfs Reddit's, but both companies derive the overwhelming share of their revenue from selling advertising against user-generated content.
