Positron Stock for Accredited Investors

AI / Machine Learning
By UpMarket Research  |  Last updated: September 2026
CEO Mitesh Agrawal Founded 2023 HQ Lovelock, NV

Positron is a private AI hardware company building purpose-built chips and systems for fast, energy-efficient inference. Its Atlas platform maps Transformer models to dedicated hardware to cut cost and power use for accredited investors. In September 2026, Positron raised $875 million in its Series C at a $5 billion post-money valuation, led by NEA, Atreides Management, Valor Equity Partners, Andra Capital, SemiAnalysis Capital and Jim Clark (Reuters and WSJ).

Access to pre-IPO shares is available to accredited investors through UpMarket.

Last Reported Valuation
$5B
Series C, 09/10/26, Reuters and WSJ
UpMarket Estimate
$6.04B
Based on UpMarket valuation model
Previous Round Valuation
$1.06B
Series B, Feb 2026

How to Invest in Positron Through UpMarket

Positron 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 Positron 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.

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Valuation Growth Over Time

Post-money valuation by round
Previous rounds Most recent
DateRoundAmount raisedValuation
Sep 2026 Series C $875M $5B
Feb 2026 Series B $1.06B

Positron's most recent reported round is its Series C, announced September 10, 2026. It raised $875 million at a reported post-money valuation of $5 billion, led by NEA, Atreides Management, Valor Equity Partners and Andra Capital. Source: Reuters and WSJ. Data as of September 27, 2026.

Why Investors Are Watching Positron

Growth Signal

Positron raises $230M, hits $1B+ unicorn valuation

Positron closed a $230 million Series B round, and Bloomberg reporting said the financing valued the AI chip startup at over $1 billion. The round was co-led by Arena Private Wealth, Jump Trading, and Unless, signaling strong investor demand for AI inference hardware.

Product Milestone

Positron is scaling Atlas and targeting Asimov tape-out

Positron said proceeds from the Series B will scale production of its Atlas system while advancing the Asimov ASIC toward a planned late-2026 tape-out. The company is also developing the Titan inference platform, extending its product stack beyond first-generation hardware.

Competitive Moat

Positron targets energy-efficient inference against GPUs

Positron builds energy-efficient AI inference hardware designed to improve performance per watt and lower total cost of ownership for transformer workloads. Forge Global said the company’s first products have already shipped to data centers and enterprises across the United States, indicating early deployment traction.

Interested in Positron stock? Fill out the form above or sign up directly. Subject to availability. Accredited investors only.

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Positron Leadership Team

Thomas Sohmers
CEO

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Positron Stock FAQ

No. As of March 2026, Positron is a private company and does not trade on any public stock exchange. Accredited investors can access Positron shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.

Positron 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 Positron 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 alternative investments since 2019.

Pre-IPO investments carry significant risks. Positron 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 $6.04B 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.

Positron was valued at $5B in its September 2026 Series C. Accredited investors can request Positron access through UpMarket.

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