Greathorn is a game studio focused on making great games that build inter-player relationships and communities by getting people to talk to one another during play. Our games feature uniquely social game mechanics that drive conversation about tactics and strategy, while also encouraging community formation through deep and innovative integrations with Discord and other community platforms.

Construction costs are climbing out of control, there is a declining construction workforce that gets smaller with every recession. Meanwhile, we’ve got a housing crisis in our major cities. Green Canopy NODE is the combination of NODE - construction technology start up that develops a house assembly kits that we manufacture in our factory in Seattle, and then ship flat-pack - like Ikea, and Green Canopy a vertically integrated developer, general contractor and real estate fund manager already operating in Seattle and Portland. We are continuing to develop and launch construction technology solutions including prefab components and software into our pipeline of residential projects ranging from small apartments, town houses, single family homes and small dwellings. Our mission is to build homes, relationships, and businesses that help regenerate communities and environments.

The Green Energy Exchange delivers affordable renewable energy direct to homes and businesses. The company offers the most affordable green energy plans in the market and is dedicated to increasing the demand for renewable energy by offering to clean energy at affordable prices. By removing middleman and inefficiencies we can provide lower prices to consumers, higher revenues to generators and help increase the adoption of clean energy sources. Empowering people to buy renewable energy at great prices will help move us to a cleaner and greener future. We are a licensed retail electric provider and operate in Texas currently.

GreenTally is a carbon accounting platform built for all businesses that transforms environmental reporting from a complex, expensive ordeal into a streamlined, affordable process. Using LLM, we help companies measure their carbon footprint in hours instead of months. GreenTally automates emissions calculations and reporting, enabling businesses to meet regulatory requirements and track reduction targets without the overhead of consultants or dedicated sustainability teams. By making enterprise-grade carbon accounting accessible and practical, GreenTally empowers growing businesses to take control of their sustainability journey.

Greenboard is building a singular, AI-powered platform to handle management of the entirety of financial firms’ compliance programs, and eventually all back office processes. Today, financial institutions use Greenboard to detect risk using AI and to rip out and replace the bad legacy back office tooling they have wanted to get rid of for years. Greenboard's mission is to enable financial institutions to operate their back office teams at a higher standard, with half of the headcount. We’re starting with compliance

Greenlite is the leading AI agent platform for compliance in financial services. Regulated banks and fintechs — including those overseen by the OCC, FDIC, and SEC — trust Greenlite to automate mission-critical work like sanction reviews and anti-money laundering investigations with speed and accuracy.

Greentoe is a next generation e-commerce marketplace that enables consumers to set the price for the products they want to buy. Created to change the way people shop, Greentoe shakes up the traditional retail model by putting consumers in the driver's seat. They make an offer on a product and the site connects them to the retailers who are willing to accept the offer. The site benefits both consumers and retailers – shoppers can buy products at the lowest price available while retailers reduce inventory and acquire new customers.

Our mission is to empower everyone to discover, create, and exchange meaningful ideas to awaken a more just world. Learn more at www.greo.com

6sense's mission is to empower marketing and sales teams with 100 percent visibility into buyers; who they are, needs and timing. 6sense provides marketers with omni-channel connectivity and visibility from brand to demand to revenue. 6sense's patent-protected predictions power all downstream sales and marketing systems with intelligence on who is in an active buying cycle, what products, when they will buy and where they are in the buyer's journey. 6sense enables intelligent growth resulting in new pipeline, higher marketing to sales conversions, larger opportunity size and increased sales productivity and effectiveness with teams focusing on the right buyers with a need now. Visit us at: http://www.6sense.com/ Learn more about us at http://www.6sense.com Keep up to date on industry trends by following us on Twitter: @6SenseInc

Greptile reviews pull requests with full context of the codebase. Top YC companies like PostHog, Raycast, Vouch, Podium, and YC's own internal software team use Greptile to review millions of changes every week. When companies start using Greptile, they catch more bugs and merge PRs 4x faster, on average Greptile can be used via the cloud, or be hosted 100% on your cloud in an air-gapped VPC.

Grey provides US, EU, and UK accounts for remote workers in emerging markets. For the first time, western companies feel comfortable recruiting skilled workers from anywhere and Grey is making it easy for these workers to receive their salary, save in foreign currency, convert to local currency and spend.

Greywing is a platform for ship operators to automate their business, through actionable intelligence, better data and communication. Greywing today serves three product lines to customers: *Flotilla* is a monitoring tool for vessels, enabling vessel managers to identify fleet-level patterns and optimizations and to identify risk and liability vectors in advance. *CRY4* is an operational tool for individual vessels that allows crew managers, security officers and masters to gather intelligence about a vessels current or proposed route, making decisions about the safest and the cheapest ports of call that a vessel can be directed to. *Landfall* is a crew management and analysis system to provide risk reporting and detailed editing capabilities about the crew on-board a vessel. *Semaphore* is a port-agent communications tool meant to simplify the process of interfacing with large numbers of port agents while planning a port call.

Gridware exists to enhance and protect the mother of all networks: the electrical grid. The grid touches everyone and makes our modern economy possible. But it’s also fragile. When the grid is compromised, everything grinds to a halt, and the consequences can be dire: wildfires burn, land is destroyed, property is damaged, progress stops, and lives are lost. Our team builds smart sensors that help utility companies to immediately detect, find, and fix outages and take steps to prevent new outages, and other related disasters, from happening at all. The need for power will only increase. We protect the grid of today while we build the grid of tomorrow. Gridware is privately held and backed by the best climate-tech and Silicon Valley investors. We are headquartered in the Bay Area in northern California.

A micromobility and payments company focused in Latin America with operations in Brazil, Mexico, Colombia, Chile, Uruguay, Argentina and Peru

GroMo (YC W21) is building India's largest financial products distribution company. GroMo has built a network of 1.2 million agents on its platform. GroMo has built a tech-enabled social commerce platform that helps agents not only improve access to better financial products for consumers, but also bridge the financial literacy gap by helping them choose the right offerings. Currently, GroMo is distributing a broad spectrum of 100+ financial products across Insurance, Investments, Credit Cards, Loans, Saving & Demat accounts, etc. from brands such as IDFC Bank, Jupiter Money, Axis Bank, Freecharge, etc.

GroundControl builds mission-critical software for manufacturers in highly-regulated industries (aerospace, defense, medical) Our core product automates lengthy, complex, and regulated quality documentation in aerospace manufacturing. As an example, the Boeing 777 is made up of over 3 million parts sourced from manufacturers around the world. These manufacturers must complete quality documentation for every part on this aircraft (machined parts, printed circuit boards, wire harnesses, assemblies, and more). GroundControl helps manufacturers complete this required documentation accurately, in minutes instead of days.

GroupAhead is a YC-backed company that allows groups to create their own dedicated smartphone apps. The easy-to-use, single-purpose app focuses solely on connecting an organization's members. With a dedicated, specialized app, member involvement and event attendance goes up, and push notifications cut through the noise of email and Facebook.

Grouper is a social club that sets up drinks between 2 groups of friends: 3 guys and 3 girls (or 3 guys and 3 guys, etc.). Grouper started in New York in the summer of 2011 and now organizes Groupers in major cities across the US. Members have shared tens of thousands of drinks. The company was founded by Michael Waxman, a Yale grad and developer who formerly started language-learning company Batiq, and Tom Brown, an MIT engineer who was an early employee at MoPub (acquired by Twitter for 350MM). The founding team also includes Challen Hodson and Kristen Badal. Grouper was funded by Y Combinator in the Winter 2012 batch.

GrowthBook is an open source platform to help companies make data-driven product decisions with feature flags and A/B tests. Existing SaaS solutions like LaunchDarkly require a company to send all of their data to them. This results in high costs, data compliance issues, and vendor lock-in. As a result, many companies end up building their own platforms in-house, which can take thousands of hours of work and lots of headaches. To solve this, GrowthBook uses a company's existing data infrastructure and business metrics. We believe feature flags and experimentation are the right way to build products at scale and that they will become a standard part of the development process. GrowthBook is well positioned to be a leader in this growing market.

Groww aims to empower people in India by making financial services simple, transparent and delightful. By leveraging technology, we build reliable and accessible financial services. Groww is India's largest stock broker (in terms of active NSE clients) and the largest distributor of mutual fund SIPs.

GrubMarket is the AI-powered technology enabler and digital transformer of American Food Supply Chain industry. Our mission is to build and provide the eCommerce and software technologies to this industry, to transform this completely offline and highly manual industry into modernized online industry powered by software technologies, and improve the efficiency of American food supply chain.

Guac accurately forecasts demand for grocery retailers, to reduce food waste and increase availability.

Your immune system is your body’s best weapon and defense against cancer. It is only when it is overcome that cancer develops into full blown disease. Dendritic cells sit at the helm of the immune system, directing and dictating immune responses. Data has shown dendritic cells are often dysfunctional in cancer patients, and that this dysfunction is a bottleneck for other therapies. Guardian Bio’s approach is focused on creating a dendritic cell-based product which drives anti-tumor activity through activating the killers of the immune system AND training them against multiple cancer targets. We take stem cells from cancer patients, turn them into specific therapeutic dendritic cells specially trained against that patient’s tumor, and re-introduce them back into the body. Our therapeutic dendritic cells revitalize the killers of the immune system and give them the kickstart they need to fight - and win - against cancer.

The rise of low-cost commercial drones has introduced a new class of asymmetric threats to U.S. national security. Off-the-shelf platforms now deliver ISR, contraband, or payloads with precision, while operating below radar coverage and beyond line-of-sight. These systems—often costing under $1,000—are capable of neutralizing multi-million-dollar defense assets. For drone detection to be viable at scale, sensors must achieve cost parity with the threat. In response, the Department of Defense established multiple initiatives to counter the rapid proliferation of uncrewed aerial systems. The Joint Counter-small UAS Office (JCO) coordinates policy and acquisition across services. The Base Defense Cross-Functional Team enables persistent perimeter security for CONUS and OCONUS installations. Falcon Peak, Red Sands, and related exercises are accelerating deployment of counter-UAS technologies in complex environments. This threat is no longer exclusive to military operations overseas. It now directly targets the U.S. homeland. In 2025, an executive order designated the protection of American airspace sovereignty a national priority, recognizing that uncrewed systems present both surveillance and kinetic risks within the United States. That same year, a domestic extremist plotted to destroy a Tennessee power substation using a drone rigged with C-4 explosives—a plan disrupted by undercover federal agents. In July 2025, an unauthorized drone collided with a rescue helicopter during disaster response operations in Kerr County, Texas, forcing an emergency landing and halting flood relief efforts. These are not isolated incidents—they reflect a broader shift in drone-enabled threats against homeland infrastructure and public safety. Guardian RF builds passive, radiofrequency-based drone detection systems for force protection and critical infrastructure defense inside the United States. Our systems are fielded under an AFWERX Direct-to-Phase-II SBIR with the 30th Security Forces Squadron at Vandenberg Space Force Base, deployed by local and state law enforcement, and integrated into commercial security operations. We were selected as a finalist for Falcon Peak 25.2, the Department of Defense’s premier counter-UAS exercise. Scout is a passive RF sensor for fixed, mobile, or temporary deployments. It detects and classifies drone control signals—including modified variants of DJI, Crossfire, and ExpressLRS—at standoff ranges. Scout supports direct integration into TAK and other operational APIs and is managed through GRF-SECURE, our secure interface for live monitoring, threat alerting, and forensic review. Mosaic extends coverage in austere environments, enabling persistent low-altitude monitoring and classification of non–Remote ID drones across complex terrain—without active emissions or mesh dependency. Built in the United States, Guardian RF delivers scalable, automated, and cost-aligned drone detection—passive by design and hardened for real-world deployment across the homeland.