In the fintech sector, we see companies operating at the intersection of emerging AI capabilities and long-established analytical models, supported by highly data-rich environments. As in many technology-related sectors, AI is helping to drive new efficiency, automation and operational improvement in the fintech sector. But while we believe generative AI is poised to transform aspects of fintech, the industry’s use of AI extends beyond language-based models.(1) In practice, we see fintech workstreams tending to rely on three different forms of data processing: classical mathematical models, machine-learning techniques and generative AI models. In our view, understanding how each is applied in fintech can provide a clearer lens for evaluating where durable innovation may be emerging and where headline-driven narratives can overstate near-term impact.
Generative AI: Enabling a New Wave of Workflow Automation
We are seeing generative AI contribute to new opportunities within fintech, helping automate certain workflows that were previously manual and difficult to scale. In our view, its impact is already significant and is likely to grow, particularly when applied to processes that depend on interpreting and synthesizing unstructured information where language, narrative and context matter most.(1)
We believe client engagement, as well as KYC and AML case management applications, offer a few examples of areas where generative AI is effectively applied. Within case management, teams are tasked with interpreting IDs, contracts and corporate filings, generating investigation summaries and working to resolve cases efficiently. Generative AI can help streamline these tasks by accelerating document interpretation and narrative construction. We are seeing similar gains emerging in research automation, earnings-call analysis and monitoring of regulatory and rulemaking developments, where large volumes of text need to be processed quickly and accurately.
Within client engagement, we are seeing financial advisors apply AI to translate complex investment strategies into clearer, more digestible explanations. VC IV portfolio company Vestmark offers one example of this trend, incorporating conversational and agentic AI capabilities into its platform in an effort to help financial advisors retrieve information, explore scenarios or complete simple tasks without navigating multiple systems. We believe tools like these can meaningfully reduce friction in day-to-day workflows, while preserving the central role of the financial advisor.
Machine Learning: Turbo-Charged by Expanding Data Volumes
Alongside classical mathematical models, we have seen quantitative machine learning emerge as a driver of innovation across fintech. Large language models focus on learning patterns in human language to generate and interpret text, while quantitative machine learning relies on explicit statistical and numerical models in an effort to make more precise predictions and decisions from structured data. As the volume of transactional and behavioral data has grown, we have seen these ML techniques become more sophisticated and more effective. Unlike rules-based systems, ML models are designed to learn from historical data to help identify patterns and anomalies using approaches such as clustering, classification and time-series analysis.
In many structured prediction tasks, including numerical modeling, regression, time-series forecasting or portfolio-level stress testing, we believe generative AI remains ill-suited. In our view, quantitative machine learning remains a more effective technology for these particular use cases and can offer higher accuracy and lower latency.(2) We already see its impact across areas such as anti-money laundering where abnormal patterns can be detected in near real time through machine learning-driven transaction monitoring and anomaly detection systems that analyze large volumes of data and highlight suspicious behavior.(3) We also see ML used in credit scoring and underwriting where machine learning models analyze diverse behavioral and transactional datasets to help enhance risk assessment and predict default risk, in some cases more precisely than traditional statistical methods.(4)
Machine learning is also helping to enable innovation in certain customer-facing financial platforms. For example, VC V portfolio company Fundraise Up’s platform is designed to apply machine learning to help personalize online donation flows by modeling donor behavior across variables such as time, location, device, language and traffic source. Trained on a large proprietary dataset of historical and real-time behavioral signals, these models are designed to optimize conversion, gift size and campaign efficiency while also supporting fraud detection and payment-risk mitigation.
Mathematical Models: Here to Stay
Despite the attention surrounding generative AI, many aspects of fintech continue to utilize classical mathematical models. While many of these models were developed decades ago, we believe they remain foundational to modern investment theory and quantitative finance. Options pricing models such as Black–Scholes, performance frameworks like CAPM and factor-based approaches such as Fama–French are widely used in portfolio construction, risk analysis and regulatory reporting. These established mathematical models continue to play an important role in areas of fintech where accuracy and regulatory requirements are central considerations.(1)
These mathematical models are typically both deterministic and explainable, characteristics that matter in financial services, in part because of demand for approaches that can be audited, tested and relied upon to produce consistent outcomes under defined assumptions. One area where we continue to see mathematical models effectively applied is market surveillance and risk monitoring. We believe Europe III portfolio company TradingHub illustrates this well, with a platform designed to apply quantitative market impact models to aid in deconstructing risk sensitivities, market correlations and the price impact of trading activity. TradingHub’s models help to better identify specific market-abuse scenarios and to reduce false positives. While generative tools may assist downstream, for example by aggregating signals across dashboards, translating outputs into more accessible formats or automating remediation workflows, we do not believe they are a replacement for the core analytical logic that underpins these systems.
We believe a similar opportunity for mathematical models exists within critical financial infrastructure. In our experience, effective core banking platforms, payment systems and trade execution rely on low latency, deterministic behavior and high uptime. We believe these requirements make them unlikely candidates for near-term disruption by generative AI.(1)
The AI Data Moat in Fintech
Across these three approaches – generative AI, machine learning and mathematical models – fintech companies can benefit from specialized datasets. Transaction data, behavioral signals and market information help create what we believe are deep competitive moats in an increasingly AI-driven world. This dynamic mirrors what we see across vertical SaaS more broadly where workflow depth and proprietary data can help create differentiation.
In fintech, data are not simply inputs to AI systems; they can be a key source of differentiation. The quality, structure and scale of financial datasets can often determine the effectiveness of models and ultimately the outcomes and information they produce.
We believe AI is poised to transform fintech, but not uniformly. Generative models are being adopted to support manual, text-heavy and customer-specific workflows while mathematical models and machine-learning techniques continue to be used in regulated, quantitative and risk-focused functions. We believe a primary differentiator will not be the choice of model alone but the data behind it. As AI adoption evolves, data can serve as an enduring asset and we believe fintech companies with proprietary or well-curated datasets will be better positioned to support differentiated offerings and long-term value for financial institutions.(1)
Growth Timeline

January 1, 2024
Acquired by Vista Equity Partners
Rebrands as InvoiceCloud
Began trading on the New York Stock Exchange under the ticker symbol KVYO on September 20, 2023
January 1, 2023
Launched Klaviyo Customer Data Platform (CDP) and reviews - Surpassed 130,000 customers
January 1, 2022
Entered into a strategic partnership with Shopify, including capital investment - Launched partnership with Wix and completed first acquisition, Napkin.io - Opened Sydney office
January 1, 2021
Completes IPO on September 23 (NYSE: ESMT)

January 1, 2020
Rebranded to EngageSmart
Introduced support for Apple Pay, Google Pay

January 1, 2017
Entered the wellness vertical with the acquisition of SImplePractice.
January 1, 2021
Raised additional capital in a funding round led by Sands Capital - Launched SMS product - Announced native integration with Prestashop and partnership with WooCommerce
January 1, 2020
Raised approximately $200 million in new capital from Summit Partners and Accel
January 1, 2019
Raised approximately $150 million in capital from Summit Partners Opened London office

January 1, 2009
InvoiceCloud founded
Focused on local government and utility verticals
January 1, 2018
Surpassed 10,000 customers
January 1, 2017
Launched a partnership with BigCommerce
June 1, 2016
Surpassed 1,000 customers
January 1, 2016
Raised new capital in a funding round led by Astrial Capital
January 1, 2015
Received SAFE financing led by Accomplice
January 1, 2014
Surpassed 100 customers
January 1, 2012
Klaviyo founded
January 1, 2021
Completes IPO (NASDAQ: LFST) on June 10
January 6, 2020
Announces majority recapitalization
January 1, 2020
LifeStance completes 50th acquisition. With COVID onset, transitioned from 300 telepsych visits per week to more than 40,000
January 1, 2020
2.3M patient visits, 370 centers and 3,000+ clinicians
January 1, 2019
1.4M patient visits, 170 centers and 1,400 clinicians
January 1, 2018
930k patient visits, 125 centers and 800 clinicians
January 1, 2017
LifeStance founded with backing from Summit Partners and Silversmith Capital Partners
January 1, 2019
Launced charity streaming - live streaming fundraising
General Atlantic invests alongside Summit and management team

January 1, 2018
Entered the non-profit vertical with the acquisition of DonorDrive
Introduced and integrated telehealth solution

January 1, 2015
Summit Partners invests
Entered the healthcare vertical with the acquisition of HealthPay24
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Related Experience
*There can be no assurance that the performance of any such professional serves as an indicator of future performance. There is no guarantee that Summit's investment professionals will successfully implement the Summit funds’ investment strategy. A complete list of Summit employees is available upon request.
(1) Projections or forward-looking statements contained herein are only estimates of future results or events that are based upon assumptions made at the time such projections or statements were developed or made. There can be no assurance that the results set forth in the projections or the events predicted will be attained, and actual results may be significantly different from the projections. Please see Important Considerations for a more fulsome disclosure with respect to projections or estimates.
(2) Source: Data Science Salon, Machine Learning for Quantitative Finance: Use Cases and Challenges, May 9, 2023
(3) Source: Duane Morris, Harnessing Artificial Intelligence in Anti-Money Laundering Compliance, September 23, 2025
(4) Source: Artificial Intelligence Review, Machine learning powered financial credit scoring: a systematic literature review, November 18, 2025
About Summit Partners
Summit Partners is a leading growth-focused investment firm, investing across growth sectors of the economy. Today, Summit manages more than $44 billion in capital and targets growth equity investments of $10 million – $500 million per company. Since the firm’s founding in 1984, Summit has invested in more than 550 companies in the technology, healthcare and life sciences, and growth products and services sectors.




