Reddit's business model in 2025 operates across three revenue streams — advertising, data licensing, and premium subscriptions — with advertising comprising approximately 90% of total revenue and the other two streams representing early-stage but strategically significant diversification. Advertising is the primary and defining revenue engine. Reddit generated $804 million in advertising revenue in 2023, up 21% from $666 million in 2022. The advertising product suite includes Promoted Posts (native ads that appear within subreddit feeds in the same format as organic content), Takeover formats (homepage and subreddit-level brand dominance campaigns), and performance advertising products that allow direct response advertisers to optimize for app installs, website visits, and conversions. The native Promoted Post format is Reddit's most valuable advertising unit because it achieves higher engagement rates than display advertising on the same pages — users who are actively reading community discussions are more contextually receptive to relevant advertising than passive scrollers on format-undifferentiated social feeds. The advertising business's structural challenge is CPM (cost per thousand impressions) premium relative to other social platforms. Reddit's average CPMs historically lagged behind Facebook, Instagram, and even Twitter/X because Reddit's anonymous user data made precision targeting and deterministic attribution difficult. The company has invested significantly in its advertising technology stack — acquiring Spiketrap in 2022 for audience context intelligence, building Reddit Pixel for conversion tracking, and developing first-party audience segments based on subreddit participation — to narrow the CPM gap. As Reddit's logged-in user base has grown and its advertising measurement capabilities have improved, CPMs have risen, but the platform still commands lower rates than identity-resolved social platforms for performance advertising budgets. The contextual advertising opportunity that Reddit is best positioned to capture is brand suitability advertising — campaigns where advertisers want their ads to appear alongside content from specific interest communities rather than targeted at specific individuals. A pet food brand advertising across r/dogs, r/cats, and r/pets is buying the attention of people demonstrably interested in the topic at a moment of active engagement. A financial services brand advertising across r/personalfinance, r/investing, and r/financialindependence is reaching people actively discussing financial decisions. This interest-graph-based contextual targeting is privacy-safe by design and increasingly valuable as third-party cookie deprecation reduces the effectiveness of behavioral retargeting across the broader digital advertising ecosystem. The data licensing business is the most strategically interesting revenue stream and the one generating disproportionate investor excitement relative to its current revenue contribution. Reddit announced a $60 million annual data licensing agreement with Google in February 2024 — allowing Google to use Reddit's content corpus to train its AI models — and has disclosed additional data licensing agreements with other AI companies. The total data licensing revenue for 2023 was approximately $58 million, a figure that is expected to grow as demand for high-quality human-generated text data for AI training continues to outpace supply. Reddit's content corpus is uniquely valuable for AI training because it consists of authentic, multi-perspective human discussion across virtually every topic domain — written by people with genuine expertise and experience expressing actual opinions in natural language. Unlike Wikipedia (curated encyclopedic content), news sites (journalistic content), or social media platforms (short-form posts without extended reasoning), Reddit contains long-form technical discussions, debate threads, personal experience narratives, and peer review exchanges that provide the nuanced reasoning patterns that large language models need to learn. The 18 years of archived Reddit content represents a data asset that cannot be recreated or substituted, making Reddit's negotiating position with AI companies structurally strong as foundation model training data demand continues to grow. Reddit Premium, the subscription offering providing an ad-free experience, custom avatar features, and access to r/lounge, generated approximately $34 million in 2023. Premium conversion rates among Reddit's user base are low — the platform's user culture has historically resisted paying for a service that has always been free — but the subscriber base is highly engaged and the ad-free premium provides an important safety valve for users whose primary objection to monetization is advertising disruption rather than platform access.