Participated · Seed · Jul 2026

Arkenstone Defense provides a managed operating system that packages government contracting requirements—cleared workforce, payroll and benefits, personnel and facility security, compliance, and accreditation—into a single service for commercial technology companies. The platform is anchored by a Professional Employer Organization (PEO) that legally employs cleared workers and carries the layered functions companies need to win and deliver federal contracts. Arkenstone launched from stealth and is led by co-founder and CEO Peter Dixon and co-founder and COO William Treseder. The company reported that more than two dozen defense technology firms already use its platform. Arkenstone positions itself to reduce the operational lead time and cost of certifications like CMMC Level 2 and other accreditation lifecycles that previously forced startups to build separate government back offices. It is headquartered in Menlo Park, California, with additional offices in Albuquerque, New Mexico and Burr Ridge, Illinois.

Participated · Series D · Jun 2019

SentinelOne provides the Singularity XDR platform, a full XDR cybersecurity solution that protects and monitors every asset in the enterprise. The platform leverages patented behavioral AI models and unifies endpoint protection (EPP), endpoint detection and response (EDR), IoT control, and container and cloud-native workload protection (CWPP). Led by CEO and co‑founder Tomer Weingarten and COO Nicholas Warner, the company plans to use the new funding to continue accelerating growth driven by demand for Singularity XDR. The company is based in Mountain View, Calif. Since its Series E in February 2020, SentinelOne’s valuation has tripled, now exceeding $3 billion. It raised $267M in the Series F round. SentinelOne builds an AI- and machine-learning-based endpoint security platform called the Singularity Platform that monitors and secures laptops, phones, containerized applications and other devices at the network edge. The company traces its roots to the Israeli cyberintelligence community and is based in Mountain View. SentinelOne reports roughly 3,500 customers, including three of the biggest companies globally and "hundreds" from the global 2,000, and has posted 113% year-on-year new bookings growth, 104% revenue growth and 150% growth in transactions over $2 million. It has about 500 employees and plans to hire up to 700 by the end of the year. Management says the funding gives the company flexibility to remain private while scaling and that an IPO would be the "next logical step" though it is not in a rush, expecting one to two years of private growth. SentinelOne has not made acquisitions to date, and leadership noted consolidation in the security market could present acquisition opportunities. SentinelOne builds a fully autonomous, machine-learning driven endpoint protection platform that covers laptops, phones, containers, cloud services and IoT devices. The company emphasizes automated detection and response that reduces the need for human intervention, and it offers managed services under the Vigilance brand and works with system integrators. Leadership says the platform digests activity across millions of endpoints and billions of events to inform its models; SentinelOne reports more than 2,000 customers and 300% year-on-year growth. The company has focused on lowering false positives (reported at ~0.04%) and plans to expand product capabilities into automatic vulnerability patching and broader IoT coverage. Financially, SentinelOne has now raised just shy of $230 million in total funding and its valuation is up from prior rounds, with public reporting implying a post-round valuation above $330 million and possibly around $500 million. SentinelOne builds endpoint protection software that uses machine learning and behavioral analysis to detect and stop multiple-vector attacks. The company positions itself as a next-generation alternative to legacy antivirus vendors. Founded by Israeli entrepreneurs in 2013 and based in Silicon Valley, its co-founders are Tomer Weingarten (CEO), Almog Cohen (CTO) and Ehud Shamir (CSO). SentinelOne has enterprise customers including Time Inc. and recently signed a strategic North American distribution deal with Avnet. It announced a $70M C round, bringing total cash raised to more than $110M, and plans to use the capital to aggressively expand sales and marketing. Analysts Gartner and IDC estimate the global endpoint protection market could approach $10 billion by 2019. SentinelOne offers an Endpoint Protection Platform that uses patent-pending Dynamic Execution Inspection to detect and block advanced attacks across vectors on endpoint machines. The platform can protect desktops, laptops (Windows and OS X), tablets, smartphones, physical and virtual servers, and embedded systems including PoS and critical infrastructure. It is certified by the independent AV-TEST Institute to perform AV functions while providing an additional layer of advanced protection, and Forbes reported that Netflix is replacing legacy AV with SentinelOne. The company announced a $25M Series B, bringing total funding to nearly $40M, and said it will use the proceeds to expand sales, marketing, research & development and customer support. Planned geographic expansions include Mountain View, Tel Aviv, New York, Paris and Singapore, with new centers to be established in Boston and London. SentinelOne plans to more than double headcount to over 100 employees in the next six months.

Led · Equity · Sep 2018

Tamr builds machine-learning-driven data products that deliver clean, curated, and continuously updated data to data consumers through customers' cloud data warehouses. Its platform includes enrichment capabilities to add third-party data to improve data quality, completeness, and value. Tamr positions its data products to support analytics and AI by providing accessible, trustworthy, high-quality data. The company says customers using Tamr gain cleaner, more complete data for use in other applications, including Alteryx. Tamr announced an investment from Alteryx via Alteryx Ventures intended to further enable development of its data products. Tamr builds an enterprise data-unification platform called Unify that applies machine learning supplemented by customers' knowledge to unify and prepare data across myriad silos. The company's patented software and agile data mastering and classification solutions target large-scale data curation challenges that traditional ETL and MDM products struggle with. Tamr says its approach is increasingly foundational to large enterprises' data management and digital-transformation efforts and cites customers such as GE, Toyota, Thomson Reuters, and GSK. The company is led by co-founder and CEO Andy Palmer with co-founding involvement from Turing Award winner Mike Stonebraker. Recent financing activity is enabling continued rapid growth to meet increased enterprise demand for data unification. Tamr develops a patented enterprise data unification software platform that applies machine learning supplemented by human expertise to unify and prepare data across silos. The platform was commercialized from research on the Data Tamer system by Turing Award winner Dr. Michael Stonebraker and co-inventors. Tamr positions its offerings as a foundational component of DataOps to help large enterprises accelerate digital transformation. The company cites a record start to 2018 and says demand from Global 2000 customers is fueling rapid growth. Customers mentioned include GE, Toyota, Thomson Reuters, and GSK. The new financing is intended to enable continued rapid growth and expand adoption of Tamr's data unification solutions. Tamr provides a data unification software platform that combines machine learning with human expertise to unify and prepare data across myriad silos and deliver business-changing insights. Co‑founded by Andy Palmer and Mike Stonebraker and based in Boston, MA, the company has worked with large enterprises to unify disparate enterprise data. Tamr began working with GE in 2014 to unify data from more than 270 separate ERP systems and now processes 20 million transactions representing $60B in direct spend. Its solution delivers unified, clean supplier data to users on the front lines at GE and is used across multiple GE business units for tasks including B2B customer record management. Customers named in the article include GE, Toyota, Thomson Reuters, GSK, HP, Philips and Amgen. The company intends to use the new funds to accelerate product development and go-to-market initiatives. Tamr builds software that discovers, catalogs and unifies disparate databases, spreadsheets and logs across enterprises to give visibility into what data a company holds. Its core product creates a central catalogue and links data for use cases like supplier insight and a 360-degree view of customers. CEO Andy Palmer has compared Tamr’s potential enterprise impact to what Google did for the web. Engineers currently work closely with customers, and the company plans to use new funding to hire additional engineers, sales and marketing staff and to train third-party partners. Customers include Toyota, GE, Novartis and investor Thomson Reuters. Tamr has about 55 employees across Cambridge and San Francisco and expects to grow to roughly 100 employees within 18 months; total funding to date is $42.4M following the latest round.

Participated · Series A · Mar 2018

Airspace Systems develops “kinetic capture” counter‑drone systems: a ground-based unit identifies offending unmanned aircraft, launches an interceptor drone that fires a tethered net, and carries the target away. The company is shifting from simple net launchers toward fully drone-focused autonomous systems that can track and capture other drones on their own. More than two-thirds of its 32 employees are currently working on autonomous flight technologies. Its interceptor drones are designed to fly two to three times faster than the fastest consumer options and combine machine vision, onboard radar and lidar to operate in varied environments. Airspace is positioning the technology to protect stadiums, commercial buildings, power plants and other public venues from potential drone threats. CEO Jaz Banga sits on the FAA’s Drone Advisory Committee, reflecting the company’s engagement with regulatory stakeholders. Financially, Airspace recently closed a $20 million Series A and has now raised $25 million to date. Airspace Systems develops the Interceptor, an autonomous drone that detects and predicts the trajectories of threatening high-speed drones using computer vision and machine-learning models trained in simulated test flights. The Interceptor deploys a Kevlar net from its underbelly to disable targets and can lift captured drones away or use an onboard parachute for safe landings if a catch fails. The company positions its offering as a service and consults with public and private sector clients rather than selling units to consumers. Airspace says its systems are modular and can be broken into components such as ground-anchored detectors or swapped-in interdiction technologies. The New York Mets are working with Airspace on stadium defenses, and the company reports pilot customers for its initial product and service. CEO Jaz Banga serves on the FAA’s Drone Advisory Committee, reflecting regulatory engagement.

Participated · Series A · Apr 2014

Sentinel Labs builds real-time, host-based endpoint and server protection across Windows, Mac OS X and Android, with agents for iOS and Linux being developed for imminent release. Its core product is a Next Generation Endpoint Protection suite built on a patent-pending predictive execution modeling engine that detects suspicious intent and blocks zero-day and targeted attacks without relying on signatures. The company emphasizes low resource usage, typically running with fractions of a percent of CPU and memory on devices. Sentinel says it works with a number of Fortune 500 companies and aims to launch the full suite by the end of the year. The team includes security experts from Intel, McAfee, Check Point and elite units of the Israel Defense Forces. Prior to this round, Sentinel raised a $2.5M seed from Accel Partners, Data Collective (DCVC), Dan Scheinman, Granite Hill Capital Partners and UpWest Labs.