Diffblue is a private software company that uses AI to automatically write Java unit tests and verify code changes. Its products are aimed at enterprise development teams and DevOps workflows.
Access to pre-IPO shares is available to accredited investors through UpMarket.
Latest Price
$25.63M
Seed / New Funding, 2019, Perplexity
UpMarket Estimate
$22M
Based on UpMarket valuation model
How to Invest in Diffblue Through UpMarket
Diffblue shares are not on public exchanges. UpMarket provides accredited investors access through secondary market transactions.
Step 01
Verify accredited investor status
Confirm eligibility under SEC Rule 501 of Regulation D. Income or net worth threshold applies.
Step 02
Create an UpMarket account
Complete KYC/AML onboarding. Typically 1–2 business days. Licensed rep assigned on signup.
Step 03
Review available Diffblue offerings
Full offering memoranda and risk disclosures provided before any commitment is required.
Step 04
Complete subscription documents
Review and sign subscription agreement. All documents handled digitally through the platform.
Step 05
Fund your investment
Wire transfer or ACH. $50K minimum. Funds held in custodial account until close.
Pre-IPO investments are illiquid, speculative, and involve risk of total loss of capital.
$1.3B+
UpMarket has brokered over $1.3 billion in alternative investments*
*Includes principal invested and appreciation of investments originated via the UpMarket platform based on historical trade volume and valuation estimates through March 31, 2026. Of the total, approximately $301 million is managed by UpMarket Management, with the remaining originated investments managed by affiliates. Past performance is not predictive of future results.
Valuation Growth Over Time
Post-money valuation by round
Previous roundsMost recent
Date
Round
PPS (split-adj.)
Valuation
2019
Seed / New Funding
$25.63M
Diffblue Revenue and Growth
Annual revenue
Why Investors Are Watching Diffblue
Growth Signal
Diffblue reported 326% net new ARR growth in six months
Diffblue said it reached a record six-month period with 326% net new ARR growth versus the prior six months. The company also announced $6.3 million in new capital in October 2024, signaling accelerating commercial traction.
Competitive Moat
Diffblue targets autonomous AI unit-test generation for Java
Diffblue describes itself as the creator of the world’s first fully autonomous generative AI-for-code software and says its platform generates unit tests for Java. That product focus and automation depth may create differentiation versus generic coding assistants.
Market Opportunity
Oversubscribed funding round backed by major strategic investors
Diffblue’s October 2024 financing was described as oversubscribed and backed by IP Group, Parkwalk Advisors, AlbionVC, Oxford University, and Citi Institutional Strategic Investments. The company said the round was an extension of its Series A and brought total funding to more than $46 million.
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No. As of March 2026, Diffblue is a private company and does not trade on any public stock exchange. Accredited investors can access Diffblue shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Diffblue does not have a public stock price because it is privately held. The most recent known share price comes from its last funding round. Pre-IPO share prices on the secondary market may differ from the last round price depending on supply, demand, and market conditions.
Yes. Accredited investors can indicate interest in Diffblue shares through UpMarket by filling out the form on this page or creating an account at upmarket.co. All pre-IPO offerings are subject to availability and require a $50,000 minimum investment. UpMarket is a FINRA-registered broker-dealer and has brokered more than $500M in alternative investments since 2019.
Pre-IPO investments carry significant risks. Diffblue shares are illiquid, meaning there is no public market to sell them quickly. There is no guaranteed exit timeline or return. The investment is speculative in nature, and investors should be prepared for the possibility of total loss. Valuations of private companies can fluctuate substantially between funding rounds. Investors should consult their financial advisor and review all offering documents before investing.
In a pre-IPO transaction, accredited investors purchase shares from existing shareholders (such as employees, early investors, or other holders) through secondary market platforms. The company itself does not issue new shares in these transactions. UpMarket facilitates these trades as a FINRA-registered broker-dealer, handling compliance, documentation, and settlement on behalf of both parties.
There are two primary exit paths for pre-IPO holdings: selling your shares on the secondary market to another buyer, or holding until the company completes an IPO or is acquired. Both paths are subject to transfer restrictions, company approval (right of first refusal), and market conditions. The timing of any exit is unpredictable, and investors should plan for a multi-year holding period.
The minimum investment for most pre-IPO offerings on UpMarket is $50,000. This amount may vary depending on the specific offering and share availability. There are no fees to create an UpMarket account or browse available investments. Investors only pay transaction-related fees when they complete an investment.
UpMarket's valuation estimate of is derived from a proprietary model that incorporates multiple data sources: funding round data (Caplight), revenue estimates (Sacra), secondary market pricing, and public company comparables. The model applies a private company discount to the public comp multiple to account for illiquidity and information asymmetry. This estimate is not investment advice and may differ substantially from the price at which shares actually trade.
Diffblue uses AI to automatically write Java unit tests and verify code changes, generating $8.4M in 2023 revenue and 326% net new ARR growth over six months, with a $22M valuation — accredited investors can access Diffblue stock through UpMarket.