Reddit is entering the S&P 500, even as its stock has decreased by 31% this year.

      The index provider announced a change on August 13 at 18:12 New York time. Reddit falls under the Communication Services sector and is traded as RDDT on the New York Stock Exchange. A second adjustment occurred two days later, with Sun Communities replacing Webster Financial in the S&P MidCap 400 on August 20. This vacancy arose after a landlord was acquired.

      This change is an off-cycle adjustment, and the rationale is significant. Equity Residential is in the process of acquiring AvalonBay Communities, with the deal expected to conclude shortly. The new entity will be renamed Vivmark Residential and will retain its spot in the index. Consequently, one S&P 500 member absorbed another, creating an opening for Reddit. Webster Financial exited the MidCap 400 for similar reasons; Banco Santander is acquiring it. Reddit did not simply fill an existing vacancy—it was the result of the two mergers.

      Reddit's share price rose approximately 11% in after-hours trading on Thursday, according to CNBC, after closing at $158.12. The increase was driven by passive market activity rather than enthusiasm, as fund managers that track the index must purchase shares to reflect the changes. This shift will alter Reddit's ownership, as every European pension fund and retail investor holding an S&P 500 tracker will automatically have a stake in the company from Tuesday, regardless of individual choice.

      Reddit will be the second pure-play social media company on the index, joining Meta. Pinterest and Snap went public earlier and have smaller market capitalizations. Twitter was previously included in the index until it was acquired by Elon Musk in 2022 and is now known as X, owned by SpaceX.

      A complicating factor is that Reddit's shares had dropped 31% for the year as of Thursday’s close, according to Bloomberg, which provides context for the announcement. However, looking at a broader view, Reddit's flotation was priced at $34 in March 2024, and it claims that its stock has increased by 430% since then, with this assessment made after this week's market movement rather than at Thursday's close.

      The company's performance is not the issue. In the second quarter of 2026, Reddit experienced its eighth consecutive quarter of revenue growth exceeding 60%, reaching GAAP profitability and gross margins above 90%. The desk analyzed that quarter and the response to it, noting revenue of $805 million (a 61% increase), a profit that more than doubled, and an 18% rise in daily active users, yet the stock still fell by 20%. The source of investor apprehension was the term "choppy" regarding search referrals. Steve Huffman attributed the volatility to Google introducing its Gemini-powered AI Overviews, stating that Reddit is still striving for a mutually beneficial outcome.

      To qualify for inclusion, a company must have a market capitalization of at least $22.7 billion according to July’s guidelines, along with requirements for profitability, liquidity, and share float. Profitability is often overlooked; many larger tech companies do not meet this criterion, but Reddit has consistently exceeded it for every quarter since Q3 of 2024. This translates to eight consecutive profitable quarters, with eight out of the ten reported since going public. In 2025, its net income reached $530 million, which the company describes as an improvement of over $1 billion compared to 2024.

      The rise of passive investing has increased the significance of such index inclusion, transforming it from a mere token to a steady source of demand. In June, the last comparable additions occurred when Marvell Technology and Flex joined the index, replacing Pool Corp and Campbell’s. Reddit went public in March 2024, raising $748 million in a highly valued flotation. Achieving benchmark status within 30 months is considered swift, especially by recent tech listing standards.

      On August 13, Reddit issued its own statement, describing its model as a unique blend of growth combined with elite profit and cash flow margins. Chief Financial Officer Drew Vollero remarked, “We’re proud to be added to the S&P 500, recognizing the growth, momentum, and consistency we’ve established as a public company.” He candidly highlighted the opportunity, stating, “Reddit’s raw materials are special, and there is so much potential to continue building great products and scaling profitably.”

      The announcement emphasizes Reddit’s extensive corpus rather than its audience size, noting over 26 billion posts and comments, with more than 130 million daily active unique users. It presents itself as an ever-expanding record of human experience across various topics, suggesting that its data could be appealing to those seeking training data as much as to advertising buyers. This perspective is intentional, positioning Reddit as a data asset within an AI economy rather than merely a website frequented by visitors.

      Investors were also looking for more AI partnerships, given Reddit’s agreements worth hundreds of millions with OpenAI and Google, both utilizing its data for training. However, the Google