CEO Ken DrazanFounded 2019HQ South San Francisco, US
Arsenal Bio is a clinical-stage, programmable cell therapy company focused on solid tumor therapies to defeat cancer. It develops engineered T cell approaches using synthetic biology, CRISPR-based tools, and machine learning. The company is private and aimed at improving efficacy, safety, and access in cell therapy.
Access to pre-IPO shares is available to accredited investors through UpMarket.
Latest Price
How to Invest in Arsenal Bio Through UpMarket
Arsenal Bio 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 Arsenal Bio 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
May 2026
Private market price
$14.60
Why Investors Are Watching Arsenal Bio
Growth Signal
ArsenalBio closed $325M Series C to advance clinical pipeline
ArsenalBio said it closed an oversubscribed $325 million Series C on Sept. 4, 2024 to advance programmable cell therapy programs through clinical development. The round brought in ARCH Venture Partners, Regeneron Ventures, NVentures and T. Rowe Price, while existing backers including BMS and SoftBank Vision Fund 2 stayed in.
Competitive Moat
BMS, PICI and Regeneron back ArsenalBio's solid-tumor platform
ArsenalBio focuses on engineering advanced CAR T-cell therapies for solid tumors, a technically hard segment where durable efficacy remains a key hurdle. Its repeated support from Bristol Myers Squibb, the Parker Institute and Regeneron suggests strategic validation of its programmable cell-therapy approach.
Market Opportunity
Pipeline spans ovarian, kidney and prostate solid tumors
ArsenalBio said its pipeline includes potential therapies for ovarian, kidney and prostate cancers, expanding beyond a single indication into multiple large oncology markets. The company describes itself as a clinical-stage programmable cell therapy firm focused on solid tumor cell therapies.
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No. As of March 2026, Arsenal Bio is a private company and does not trade on any public stock exchange. Accredited investors can access Arsenal Bio shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Arsenal Bio 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 Arsenal Bio 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. Arsenal Bio 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.
ArsenalBio is a clinical-stage programmable cell therapy company focused on engineered T cell therapies for solid tumors, and it raised $325M in its Series C to advance its clinical pipeline — accredited investors can access Arsenal Bio stock through UpMarket.