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Stripes is an NYC-based growth equity firm that invests in and actively supports best-in-class, category-defining companies. We believe Isomorphic Labs will revolutionize drug discovery.
Stripes partners with founders building n-of-1, category-defining companies with enormous opportunity. We look for amazing products with amazing market opportunities.
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Returns on late-stage pipelines have improved for three years in a row, but the improvement depends almost entirely on one drug class. Outside GLP-1s, the economics of discovery have not changed.
Sources: Deloitte, Measuring the return from pharmaceutical innovation, 16th edition, May 2026 (IRR, cost per asset, blockbuster concentration). Evaluate Pharma loss-of-exclusivity analysis, 2026, as reported by DCAT Value Chain Insights (sales at risk).
Clinical attrition has not improved meaningfully in two decades. Most failures happen in Phase 2, and many trace back to decisions made at the design stage: which target to pursue and how well the molecule binds it.
Phase 2 success rates for AI-discovered molecules are so far in line with historical norms, at roughly 40%. The Phase 1 improvement suggests AI is already producing safer, more drug-like molecules. Whether it can also improve efficacy is still an open question, and it is the one Isomorphic's work on target selection and binding affinity is designed to answer.
Sources: Nature Communications, "Dynamic clinical trial success rates for drugs in the 21st century", 2025 (phase transitions, ~5% overall). BIO, Informa and QLS Advisors, Clinical Development Success Rates 2011–2020 (Phase 2 → 3: 28.9%; likelihood of approval 7.9%). Jayatunga et al., Drug Discovery Today, 2024 (AI-discovered Phase 1 80–90%, Phase 2 ~40%). IQVIA Institute, Global R&D Trends 2026, March 2026 (AI-enabled Phase 1 75%, timelines, 79 launches).
It has taken six years to go from AlphaFold 2 to the first Phase 3 trial of a drug designed with generative AI. Regulators have adjusted alongside the science. The milestones we have followed:
DeepMind's model reaches experimental-level accuracy at CASP14, addressing a problem that had been open for 50 years.
Published in Nature by Google DeepMind and Isomorphic Labs. Structure prediction becomes directly useful for drug design.
Demis Hassabis and John Jumper are recognised for AlphaFold.
The agency publishes a roadmap encouraging AI-based computational models and other new approach methodologies in IND submissions, effective immediately. It reported meeting its first-year goals in April 2026.
Rentosertib, for which both the target and the molecule were generated with AI, improves lung function in idiopathic pulmonary fibrosis. Published in Nature Medicine.
IsoDDE more than doubles AlphaFold 3's accuracy on the hardest protein-ligand cases and improves on it 2.3x for antibody-antigen prediction. It predicts binding affinity at the accuracy of physics-based methods in a fraction of the time.
Led by Thrive Capital with Alphabet, GV, CapitalG, MGX, Temasek and the UK Sovereign AI Fund. The capital is intended to scale the engine and advance proprietary programs toward the clinic.
Rentosertib enters a 320-patient Phase 3 trial, the first late-stage test of a drug designed this way.
Sources: Google DeepMind and Isomorphic Labs, Nature, May 2024 (AlphaFold 3). Nobel Foundation, October 2024. FDA press announcements, 10 April 2025 and April 2026. Nature Medicine, June 2025 (rentosertib Phase 2a). Isomorphic Labs, technical report and announcement, 10 February 2026 (IsoDDE); Series B announcement, 12 May 2026. Insilico Medicine press release, 10 September 2026 (GENESIS-IPF-3).
2026 opened with a series of large AI platform agreements. Major pharma companies are increasingly paying for design engines, compute and multi-target access rather than licensing individual assets.
Sources: Isomorphic Labs announcements, 7 January 2024 and 20 January 2026. Insilico Medicine press release, 29 March 2026. Eli Lilly investor release, 12 January 2026. Merck press release, 22 April 2026. Genetic Engineering & Biotechnology News, 22 January 2026 (Chai, Boltz, Noetik). IQVIA Institute, Global R&D Trends 2026, March 2026. Citeline, Pharma R&D Annual Review 2026.
Six observations about where AI drug discovery is heading. Taken together, they point to the kind of company the industry's structure will favour. Each is expanded on the pages that follow.
AI drug discovery has progressed from structure prediction to lead creation. As the frontier shifts toward harder biology and, ultimately, predicting clinical success, competitive advantage should increasingly accrue to scaled, full-stack platforms that can compound proprietary experimental and human outcome data while capturing the economics of the drugs they create. We believe this positions Isomorphic particularly well.
The first wave of AI breakthroughs was about understanding biology, most notably predicting protein structures. The field has since progressed to generating actual drug candidates against a target, and is now compressing meaningful parts of the discovery workflow into computation.
Bispecifics are a good example. In the wet lab they are painful. On the computer you design both arms at once.
AI Researcher, Frontier Drug Discovery Lab
Sources: Abramson et al., Nature, May 2024. Chai Discovery, "Zero-shot antibody design in a 24-well plate", bioRxiv, July 2025. Isomorphic Labs, IsoDDE technical report, 10 February 2026. Nature Medicine, June 2025; Insilico Medicine, 10 September 2026.
What used to be a chain of separate wet-lab campaigns, find a binder, then fix developability, then fix cross-species reactivity, is becoming a single design step. On a hard program that takes one to two years out of the front end.
AI Researcher, Frontier Drug Discovery Lab
Early advances in AI drug discovery were driven mainly by algorithmic innovation: better architectures, training techniques and ways of representing biological structure. As those capabilities advance and become commoditised, differentiation is moving to proprietary data, the experimental loops that generate it, and integration across the stack.
Most of the progress so far came from better algorithms. That phase is ending, because everyone now trains on the same public data and shares the same blind spots. Differentiation has to come from data nobody else has.
AI Researcher, Frontier Drug Discovery Lab
The lab is what made the algorithms improve. Every recipe change was tested against real binders, and the speed of that loop decided who moved fastest.
AI Researcher, Frontier Drug Discovery Lab
Sources: Recursion and MIT Jameel Clinic, 6 June 2025 (Boltz-2). Eli Lilly investor release, 9 September 2025 (TuneLab). Genetic Engineering & Biotechnology News, 22 January 2026. Isomorphic Labs, 10 February 2026.
A thousand molecules designed by your own model and put through your own assays teach the model more than a hundred thousand random molecules bought from anyone else.
AI Researcher, Frontier Drug Discovery Lab
AI has made substantial progress on the easier lead-generation problems: targets with well-characterised structures and plenty of data. The frontier is now moving on two fronts at the same time.
Target classes where structural states are more complex and training data are scarce. Models are beginning to produce leads here, and the first successes are appearing.
Beyond a molecule that binds its target, toward a candidate more likely to work in patients. This is where a large share of value sits: most of the cost of drug development is spent on candidates that fail in the clinic.
Look closely at where the published hits are and it is mostly targets pharma already had antibodies against, or that sit in the Protein Data Bank. The easy problem is solved. The hard targets are not.
AI Researcher, Frontier Drug Discovery Lab
Discovery AI and preclinical AI are different problems with different data. The first asks whether a molecule can be made to bind. The second asks whether it will be safe and effective in a person. Because clinical attrition compounds, improvements in the second are worth at least as much as improvements in the first.
Since the middle of 2025 the frontier has moved to GPCRs, ion channels and peptide-MHC. Binders against those are no longer impossible, but they are not routine, and they need much more wet-lab throughput than a one-shot model can give you.
AI Researcher, Frontier Drug Discovery Lab
Better molecules do not solve Phase 2. Not one AI-designed antibody has been in a human yet, and the in-vitro assays for immunogenicity tell you little about what will happen in a patient.
AI Researcher, Frontier Drug Discovery Lab
Sources: Hauser et al., Nature Reviews Drug Discovery, 2017 (GPCRs). Dowden and Munro, Nature Reviews Drug Discovery, 2019 (Phase 2 failure causes). IQVIA Institute, Global R&D Trends 2026, March 2026. Endpoints News and BioPharmaTrend on Axiom Bio, 2025; Vivodyne Series A release, 28 May 2025. Isomorphic Labs, 10 February 2026.
Predicting whether a molecule will work in the clinic is the real prize. It will take years, but even moving the success rate by ten or twenty points would change the economics of the industry.
AI Researcher, Frontier Drug Discovery Lab
Organoids, organs-on-chip, virtual cells and animal models improve preclinical prediction, but they can only take a model so far. If the problem is predicting clinical success, large-scale human outcome data is the ground truth. Platforms with scale, their own assets and large pharma partners can accumulate that data, and it compounds back into better models.
Sources: Roche media release, 15 February 2018. Eli Lilly investor release, 9 September 2025. FDA press announcement, 10 April 2025. Isomorphic Labs announcements, 7 January 2024 and 20 January 2026.
Pharma's willingness to pay for software and research services is constrained by workflow ROI and R&D budgets. The value created by a successful therapeutic can reach billions of dollars. The asymmetry is large.
Sources: Schrödinger, fourth-quarter and full-year 2025 results, February 2026. Insilico Medicine, 29 March 2026. Deloitte, Measuring the return from pharmaceutical innovation, May 2026.
Taken together, we believe AI drug discovery is evolving from a model-quality race into a race to build the best closed-loop drug development system.
Sources: Xaira Therapeutics launch release, 23 April 2024. Insilico Medicine, 29 March and 10 September 2026. Recursion investor releases, 2025. Isomorphic Labs, 12 May 2026; CEO public statements, 2026.
Stripes' in-house Scale Team provides hands-on support across every critical function — not just capital, but execution firepower embedded alongside your team.
Executive search, org design, compensation benchmarking, employer branding
Brand positioning, content strategy, demand generation, event marketing
FP&A setup, audit readiness, legal counsel, entity structuring, tax strategy
Data infrastructure, KPI dashboards, customer analytics, pricing optimization
GTM strategy, enterprise sales playbooks, pipeline management, partnership sourcing
Procurement, vendor management, international expansion, systems & process design
Help design and staff the enterprise sales motion for pharma partnerships — including territory planning, pricing strategy, and customer success frameworks
Source and recruit senior commercial leaders with pharma/biotech experience — CRO, VP Sales, Head of Partnerships — through our proprietary network
Leverage advisory council relationships to open doors at top 20 pharma — warm intros to R&D decision-makers and Chief Digital Officers
Position Isomorphic as the category leader in AI drug discovery — conference strategy, media relations, case study development, and analyst engagement
Healthcare is a core vertical for Stripes. We've built category leaders across pharma services, health tech, clinical analytics, and digital health — giving us pattern recognition directly relevant to Isomorphic.
Pattern recognition: Across these investments we've learned how to sell complex technology platforms into pharma R&D organizations — long sales cycles, multi-stakeholder buying committees, compliance requirements, and the importance of clinical validation.
Deep conviction in AI infrastructure and applications — direct pattern recognition for Isomorphic's AI-native approach to drug discovery.
Six Operating Partners work hands-on inside portfolio companies. Around 120 senior advisors and council members across pharma, healthcare, technology and enterprise provide access to decision-makers. The names below are the ones most relevant to Isomorphic; the full network is larger.
Full-time members of the Stripes team. They work inside portfolio companies on execution, not as outside advisers.
| Name | Background | Relevance to Isomorphic |
|---|---|---|
| Paul Melchiorre | Former CRO, Anaplan | Enterprise sales: territory design, pricing and repeatable large-deal processes for pharma buyers |
| Scott Aronson | Former COO, Cloudera | Turning bespoke technical engagements into a scalable platform offering |
| Sharon Rothstein | Former Global CMO, Starbucks | Category positioning as the company moves from research lab to commercial partner |
| Julie Herendeen | Former CMO, Dropbox | Demand generation and pipeline within pharma and biotech |
| Barb Messing | Former Chief Marketing & People Experience Officer, Roblox; former CMO, Walmart US and TripAdvisor | Employer brand and people operations through rapid headcount growth |
| Brigitte Kleine | Former President, Tory Burch; former President, Michael Kors | Scaling operations from a founder-led organisation to a global one |
Former Chief Scientific Officer and President of Worldwide Research, Development and Medical at Pfizer, where he led one of the largest R&D organisations in the industry, including its external partnering.
Former SVP and CIO of Amgen, following 17 years at Eli Lilly, and the first CIO of Workday. Board member at Vertex Pharmaceuticals and MetLife.
Eight further Senior Advisors include former CIOs and CTOs of PayPal, Zoom, AIG and Lockheed Martin.
Sitting executives who meet with portfolio companies as prospective customers, reference buyers and advisers. Listed here are the members at pharma, healthcare and AI-infrastructure organisations.
Source: Stripes, Scale Resources and team pages, stripes.co, as of 29 September 2026. Titles as listed there.
We believe Isomorphic Labs can revolutionize drug discovery. Let's build the future of medicine together.