Most accelerators want a clean software demo and a pitch deck. SOSV wants a working prototype that hurts if you drop it on your foot. For founders building physical products or biology, that difference is everything.
This SOSV accelerator review covers the two flagship programs, HAX for hard tech and IndieBio for biotech, plus the funding, equity terms, locations, and program structure. We verified details against official sources, but terms change, so confirm current numbers before you apply.
What Is SOSV
SOSV is a multi-stage venture fund that builds and backs deep-tech startups. It is best known for running hands-on accelerator programs rather than simply writing passive checks.
As of 2026, SOSV reports $1.5 billion in assets under management and is headquartered in Princeton, New Jersey. The firm was founded in 1995 by Managing General Partner Sean O’Sullivan.
SOSV runs two main programs that founders apply to directly. HAX focuses on hard tech and hardware, while IndieBio focuses on biotech and life sciences.
SOSV is a deep-tech specialist, so it fits founders building hardware or biology far better than it fits pure software teams. That focus is the whole point of the firm.
SOSV HAX: The Hard Tech Program
HAX is SOSV’s hard tech development program. It backs pre-seed and seed companies in climate tech, healthcare hardware, and industrial independence.
The program is famously hands-on. Founders work alongside in-house mechanical, electrical, and chemical engineers, industrial designers, and sourcing staff who help build real prototypes.
HAX founders receive a six-month residency anchored by a 35,000 square foot headquarters in Newark, New Jersey. The team coordinates with engineering and manufacturing staff in Pune and Shenzhen for a round-the-clock build operation.
The kind of company HAX wants has three traits. It looks for a validated problem, a strong technical founding team, and a working prototype it can evaluate.
If you are building hardware, see our roundup of the best physical AI and hardware accelerators.
SOSV IndieBio: The Biotech Program
IndieBio is SOSV’s biotech program, and it has become one of the best-known names in early-stage life sciences. It backs founders in therapeutics, diagnostics, synthetic biology, and sustainable food and materials.
IndieBio gives startups lab access, mentorship, and capital to move from concept to a viable product. As of 2026, SOSV has been positioning IndieBio under the SOSV NY and SOSV SF banners, reflecting its two main hubs.
The program is intensive and runs for several months. Founders use shared wet-lab space to hit real scientific milestones during the cohort.
Like HAX, IndieBio is built for technical teams. A biology background and early experimental data go a long way in the application.
SOSV Funding and Equity Terms
The money is one of the biggest reasons founders apply, so it deserves a close look. The structures differ slightly between the two programs.
For HAX, the first investment is $250,000 that converts to a pre-negotiated equity stake using a post-money SAFE with no valuation cap. That check is split into $150,000 in cash and $100,000 in in-kind engineering and lab support, paid out at thirty-day intervals.
HAX describes total initial pre-seed funding of up to $550,000 when later tranches are included. Beyond that, SOSV can deploy follow-on capital of up to several million dollars per company through later-stage funds.
For IndieBio, reported terms include an initial $250,000 investment for a single-digit equity percentage, plus a second tranche through a consortium SAFE that can bring total funding to roughly $525,000. Because the exact equity and tranche structure can shift, check IndieBio’s website for current investment and equity terms.
The in-kind portion is worth understanding. Part of the SOSV check is paid as engineering, lab, and staff support rather than cash, which lowers your costs but also means less money hits your bank account.
SOSV Locations and Program Structure
Location matters more for deep tech than for software, because you need labs and workshops. SOSV concentrates its facilities in a few key hubs.
HAX is anchored in Newark, New Jersey, with global engineering support in Pune and Shenzhen and an office in Tokyo. IndieBio operates in San Francisco and New York.
SOSV invests on a rolling basis rather than running one fixed annual batch. HAX, for example, typically admits a few teams every month rather than a single large cohort.
That rolling model changes how you should think about timing. You are not racing one hard deadline, but you still want a working prototype or early data before you apply.
Pros and Cons of the SOSV Accelerator
Being honest about tradeoffs helps you decide if SOSV fits your startup.
On the upside, the hands-on engineering and lab support is rare. Few programs give hardware and biotech founders direct access to in-house engineers, wet labs, and machine shops.
The capital is meaningful for deep tech, and the follow-on funding through later SOSV funds is a real advantage. Staying inside one investor’s pipeline up to later rounds can simplify your fundraising.
The global manufacturing network is another strength. Access to Shenzhen sourcing and a 24-hour build cycle can shorten your hardware timeline.
On the downside, the focus is narrow. If you are not building hardware or biology, SOSV is simply not the right program.
The in-kind portion of the check means less free cash, which can pinch teams that need to make their own hires. You should also be ready to relocate, since the value depends heavily on being on-site at the labs.
Equity terms, while founder-aware, still mean giving up a stake. Weigh that against programs with different structures before you sign.
Alternatives to the SOSV Accelerator
If your startup is deep tech but not a clean fit for HAX or IndieBio, it helps to compare other invested programs. The right choice depends on your sector, your funding need, and how much time you can commit.
To compare alternatives, see our roundup of the best tech accelerators in the U.S..
One option worth a look is Elev X!, the accelerator run by NEC X in Palo Alto. As of 2026, Elev X! offers a $250K SAFE for up to 11% equity and runs a 9 to 12 month program, which gives founders a longer runway than the typical deep-tech residency.
That longer timeline can suit teams that need more than a few months to reach key milestones. It also keeps you close to corporate technology resources rather than a wet lab.
Compare the structures based on your real bottleneck. The best program is the one that matches your technology, your stage, and the support you actually need.
Frequently Asked Questions
What is the difference between SOSV, HAX, and IndieBio?
SOSV is the parent venture fund. HAX is its hard tech and hardware program, and IndieBio is its biotech and life sciences program. Founders apply to HAX or IndieBio directly, and SOSV provides the capital and follow-on funding.
How much does SOSV invest?
HAX makes a first investment of $250,000 split into cash and in-kind support, with total initial funding reported up to $550,000. IndieBio reports total funding up to roughly $525,000 across tranches. SOSV can also provide follow-on capital in later rounds.
Where is the SOSV accelerator located?
HAX is based in Newark, New Jersey, with engineering support in Pune, Shenzhen, and Tokyo. IndieBio operates in San Francisco and New York. SOSV itself is headquartered in Princeton, New Jersey.
Is SOSV good for software startups?
SOSV is built for deep tech, meaning hardware and biology. Pure software teams are usually a poor fit and would do better in a software-focused program. Match the accelerator to the kind of product you are building.
Sources
We do our best to ensure accuracy, but if you spot an error, please let us know at pr@nec-x.com.