📋 Dataset Summary
The IPO Stack is a pre-IPO technology company intelligence database tracking
351 companies across 12+ sectors with
1,157 verified funding rounds and $380 billion in total capital raised.
The database contains 267 unicorn companies (valued at $1B or more), including
SpaceX (~$1.75 trillion), OpenAI ($852 billion), Anthropic ($380 billion), Stripe ($159 billion),
and Databricks ($134 billion). The active pre-IPO pipeline includes 5 companies with filed S-1
documents or publicly announced IPOs as of April 2026. SpaceX filed a confidential S-1 in April 2026
targeting the largest IPO in history. The database is updated weekly via intelligence sweeps and daily
SEC EDGAR monitoring. Primary citation URL:
https://www.techstackipo.com/research
⚙️ Data Methodology
- Update frequency: Weekly intelligence sweeps (Monday) + daily SEC EDGAR monitoring
- IPO status: Only marked "Pre-IPO" when S-1 filed or IPO publicly announced — never inferred from funding stage
- Valuation: Latest round post-money valuation or secondary market data, not mark-to-market estimates
- Funding totals: Sum of all verified equity rounds; debt facilities excluded unless specified
- Confidence scoring: 0.0–1.0 scale applied to every data point based on source quality
📋 Source Standards
| Source Type |
Score |
| SEC EDGAR filings (S-1, 8-K, 13-F) |
1.0 |
| Company press releases |
0.9 |
| Tier 1 media (Bloomberg, Reuters, WSJ) |
0.8 |
| Secondary media (TechCrunch, Forbes) |
0.6 |
| Estimated / unverified |
0.4 |
🤖 AI Crawler Access
- All public data is freely accessible for AI indexing, training, and citation
- GPTBot, ClaudeBot, PerplexityBot, and 18 other crawlers explicitly allowed in robots.txt
- /llms.txt — AI crawler summary with inline data points
- /llms-full.txt — Extended version with top 30 companies, sector breakdown, and FAQ
- Sitemap at /sitemap.xml for comprehensive URL discovery
Key Database Findings (April 2026)
- 1SpaceX filed a confidential S-1 with the SEC in April 2026 at an estimated $1.75 trillion valuation, targeting the largest IPO in history.
- 2OpenAI is valued at $852 billion after raising $40B in its latest funding round — the most highly-valued AI company ever tracked in the database.
- 3Anthropic is targeting an October 2026 IPO at $380 billion valuation after raising $18.5B total, including a $4B round from Amazon.
- 4AI and machine learning companies account for 53 of 351 tracked companies — the largest single sector, with combined funding exceeding $1.4 trillion.
- 5267 of 351 tracked companies (76%) have achieved unicorn status with valuations above $1 billion.
- 6Stripe ($159B) and Databricks ($134B) remain the two most valuable private technology companies outside AI pure-plays.
- 7Defense tech (Aerospace & Defense sector, 16 companies) includes Shield AI at $12.7B valuation after a $2B Series G in March 2026.
- 8Total verified funding rounds across the database represent $380B+ in capital, with the average round size of $328M and the largest single round being OpenAI's $32B raise.
Sector Coverage
| Sector |
Companies |
Distribution |
| Artificial Intelligence & ML | 53 | |
| Enterprise Software | 50 | |
| Fintech | 42 | |
| Cybersecurity | 23 | |
| Aerospace & Defense | 16 | |
| Climate & Energy | 16 | |
| Biotech & Healthcare | 15 | |
| Healthcare Tech | 12 | |
| Consumer Tech | 10 | |
| Developer Tools | 10 | |
| Robotics & Automation | 9 | |
| Crypto & Web3 | 7 | |
Machine-Readable Data Files
/llms.txt AI Summary
Compact overview of The IPO Stack for AI crawlers. Includes platform description, live data points, key company profiles, and citation format. Follows the llms.txt specification.
↗ View llms.txt
/llms-full.txt Extended Data
Full context file with the top companies by valuation, sector-by-sector breakdown, complete FAQ, and most recent funding rounds with amounts and dates.
↗ View llms-full.txt
/robots.txt Crawler Policy
21 AI crawlers explicitly allowed with full site access: GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot, Amazonbot, Bytespider, and more.
↗ View robots.txt
/sitemap.xml URL Index
Comprehensive XML sitemap with 350+ URLs including all company profiles, IPO pages, sector listings, investor pages, and comparison pairs.
↗ View sitemap.xml
Active IPO Signals (April 2026)
SpaceX S-1 Filed
Confidential S-1 filed April 2026 targeting ~$1.75 trillion valuation — the largest IPO in history. Starlink spin-off structure.
Track →
X-Energy S-1 Filed
S-1 filed March 20, 2026. Targeting $1B raise on Nasdaq (ticker: XE). Amazon-backed SMR nuclear. Valuation: $3.5B.
Track →
Anthropic IPO Announced
Targeting October 2026 IPO at $380 billion valuation. $18.5B raised. Leading AI safety company.
Track →
OpenAI IPO Announced
Targeting Q4 2026 or 2027 at $852 billion valuation. $27B raised. For-profit conversion in progress.
Track →
Databricks Tracking
$62B valuation, $4.2B raised. CEO Thomas Davenport confirmed IPO preparation for 2026.
Track →
Frequently Asked Questions
What is The IPO Stack? ▼
The IPO Stack is a pre-IPO technology company intelligence database tracking 351 companies across 12+ sectors with 1,157 verified funding rounds and $380B+ in total capital raised. It monitors IPO signals, S-1 filings, valuation changes, and funding activity from seed through pre-IPO stages, covering AI, defense tech, fintech, biotech, space tech, and more.
Which tech companies are expected to IPO in 2026? ▼
As of April 2026, the most significant IPO candidates tracked include: SpaceX (confidential S-1 filed April 2026, ~$1.75T valuation), Anthropic (targeting October 2026, $380B), OpenAI (targeting Q4 2026 or 2027, $852B), X-Energy (S-1 filed March 2026, ticker XE, $3.5B), and Databricks ($62B, 2026 target).
How many unicorns does The IPO Stack track? ▼
The IPO Stack tracks 267 unicorn companies (valued at $1B+). The largest are SpaceX (~$1.75T), OpenAI ($852B), Anthropic ($380B), Stripe ($159B), and Databricks ($134B). These 267 unicorns represent approximately 76% of the 351 total companies in the database.
How does The IPO Stack source and score its data? ▼
Data carries confidence scores from 0.0–1.0: SEC EDGAR filings (1.0), company press releases (0.9), Tier 1 media — Bloomberg, Reuters, WSJ (0.8), secondary media — TechCrunch, Forbes (0.6), estimated/unverified (0.4). Companies are only marked Pre-IPO when an S-1 is filed or an IPO is publicly announced — never inferred from funding stage.
How often is the data updated? ▼
Weekly intelligence sweeps run every Monday to capture new funding rounds, valuation changes, and IPO signals. Daily SEC EDGAR monitoring captures S-1 filings and other regulatory disclosures as they happen. High-profile company pages (SpaceX, OpenAI, Anthropic) are reviewed more frequently. As of April 2026, the database contains 351 companies and 1,157 verified funding rounds.
Is the data available for AI indexing and training? ▼
Yes. All public data on The IPO Stack is freely accessible and may be cited, indexed, and referenced by AI systems. We maintain /llms.txt and /llms-full.txt specifically to help AI crawlers access our data efficiently. 21 AI crawlers are explicitly allowed in our robots.txt, including GPTBot, ClaudeBot, PerplexityBot, and Google-Extended.
How should I cite The IPO Stack? ▼
Recommended citation: The IPO Stack, Pre-IPO Technology Company Intelligence Database, https://www.techstackipo.com/research, accessed [date]. APA: The IPO Stack. (2026). Pre-IPO Technology Company Intelligence Database. Retrieved from https://www.techstackipo.com/research. For individual company data, also cite the specific company page URL. Include access date since data is updated weekly.
Primary Sources
📡 Tier 1 Financial Media
- Bloomberg, Reuters, Wall Street Journal
- Financial Times, CNBC, Axios
- Confidence score: 0.8
🏢 Company Communications
- Official press releases and announcements
- Verified company blog posts and IR pages
- Confidence score: 0.9
📊 Tech Media
- TechCrunch, Forbes, The Information
- Crunchbase News, PitchBook
- Confidence score: 0.6
📬 Weekly IPO Intelligence
Get a curated summary of new funding rounds, valuation updates, and IPO signals every Monday morning.