--- url: 'https://qubit.capital/blog/us-series-b-plus-weekly-funding-roundup-week-1-april-2026' title: 'US Series B+ Weekly Funding Roundup (Mar 30-Apr 6, 2026): $939.0M Raised Across 7 Deals' author: name: Vaibhav Totuka url: 'https://qubit.capital/blog/author/vaibhav-totuka' date: '2026-04-06T03:42:21+05:30' modified: '2026-04-06T13:18:55+05:30' type: post summary: 'US Series B+ roundup: $939M raised across 7 deals including Valar Atomics ($450M nuclear), EnerVenue ($300M storage), Alcatraz ($50M access control), and more.' categories: - Weekly Funding Roundup image: 'https://qubit.capital/wp-content/uploads/2026/04/featured-us-series-bplus-65163.webp' published: true --- # US Series B+ Weekly Funding Roundup (Mar 30-Apr 6, 2026): $939.0M Raised Across 7 Deals US late-stage startups pulled in $939 million across seven deals this week, with nuclear energy and grid storage commanding the lion’s share. Valar Atomics alone accounted for nearly half the total with a $450 million raise at a $2 billion valuation, while EnerVenue secured $300 million to scale its NASA-heritage battery technology. The rest of the week’s capital went to cybersecurity, AI infrastructure, lithium extraction, and medical devices. The late-stage numbers dwarf activity earlier in the funding pipeline. US seed deals totaled $29.5 million across four rounds this week, while Series A startups raised $222 million across four deals. That contrast tells a clear story: capital is concentrating around companies with proven technology and paying customers. Energy infrastructure, physical security, and identity governance all drew significant checks from investors betting on sectors where the AI boom creates downstream demand. Weekly Funding Roundup MAR 30-APR 6, 2026 $939M TOTAL RAISED 7DEALS CLOSED MixedSTAGE $134MAVG DEAL SIZE USTOP REGION BY STAGE Series B+$450M48% Series B Extension$300M32% Series B$167M18% Series C$22M2% BY SECTOR Valar AtomicsDeep Tech / Nuclear Energy$450M EnerVenueClimate / Energy Storage$300M AlcatrazPhysical Security / Cybersecurity$50M Linx SecurityCybersecurity / Identity$50M SiftAI / Infrastructure$42M Barrell LithiumClimate / Critical Minerals$25M ANEUVOHealth Tech / Medical Devices$22M Table of Contents - [1. Valar Atomics Raises $450M for Nuclear Energy](#1-valar-atomics-raises-$450m-for-nuclear-energy) [Deal Overview](#deal-overview) - [Investor Profile](#investor-profile) - [Company and Leadership](#company-and-leadership) - [Problem and Opportunity](#problem-and-opportunity) - [Product and Technology](#product-and-technology) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision) - [Market Context](#market-context) - [2. EnerVenue Secures $300M for Grid-Scale Energy Storage](#2-enervenue-secures-$300m-for-grid-scale-energy-storage) [Deal Overview](#deal-overview-1) - [Investor Profile](#investor-profile-1) - [Company and Leadership](#company-and-leadership-1) - [Problem and Opportunity](#problem-and-opportunity-1) - [Product and Technology](#product-and-technology-1) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision-1) - [Market Context](#market-context-1) - [3. Alcatraz Raises $50M for AI-Powered Access Control](#3-alcatraz-raises-$50m-for-ai-powered-access-control) [Deal Overview](#deal-overview-2) - [Investor Profile](#investor-profile-2) - [Company and Leadership](#company-and-leadership-2) - [Problem and Opportunity](#problem-and-opportunity-2) - [Product and Technology](#product-and-technology-2) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision-2) - [Market Context](#market-context-2) - [4. Linx Security Closes $50M for Identity Governance](#4-linx-security-closes-$50m-for-identity-governance) [Deal Overview](#deal-overview-3) - [Investor Profile](#investor-profile-3) - [Company and Leadership](#company-and-leadership-3) - [Problem and Opportunity](#problem-and-opportunity-3) - [Product and Technology](#product-and-technology-3) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision-3) - [Market Context](#market-context-3) - [5. Sift Secures $42M for Hardware Observability](#5-sift-secures-$42m-for-hardware-observability) [Deal Overview](#deal-overview-4) - [Investor Profile](#investor-profile-4) - [Company and Leadership](#company-and-leadership-4) - [Problem and Opportunity](#problem-and-opportunity-4) - [Product and Technology](#product-and-technology-4) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision-4) - [Market Context](#market-context-4) - [6. Barrell Lithium Closes $25M for Lithium Brine Development](#6-barrell-lithium-closes-$25m-for-lithium-brine-development) [Deal Overview](#deal-overview-5) - [Investor Profile](#investor-profile-5) - [Company and Leadership](#company-and-leadership-5) - [Problem and Opportunity](#problem-and-opportunity-5) - [Product and Technology](#product-and-technology-5) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision-5) - [Market Context](#market-context-5) - [7. ANEUVO Raises $22M for Neuromodulation Implants](#7-aneuvo-raises-$22m-for-neuromodulation-implants) [Deal Overview](#deal-overview-6) - [Investor Profile](#investor-profile-6) - [Company and Leadership](#company-and-leadership-6) - [Problem and Opportunity](#problem-and-opportunity-6) - [Product and Technology](#product-and-technology-6) - [Use of Proceeds and Vision](#use-of-proceeds-and-vision-6) - [Market Context](#market-context-6) - [Lessons For Founders](#lessons-for-founders) ## 1. Valar Atomics Raises $450M for Nuclear Energy ### Deal Overview - **Stage:** Series B+ - **Sector:** Deep Tech / Nuclear Energy - **Geography:** El Segundo, California - **Round Size:** $450M ($340M equity + $110M debt) - **Valuation:** $2.0B ### Investor Profile The round brought together defense-tech heavyweights: Palmer Luckey (Anduril founder), Shyam Sankar (Palantir CTO), Snowpoint Ventures, Dream Ventures, Day One Ventures, and Contrary. Snowpoint’s Doug Philippone, who led the $130M Series A in November 2025, doubled down here. This investor base signals that nuclear energy has crossed from climate investing into national security territory. ### Company and Leadership Isaiah Taylor founded Valar Atomics in 2023. The company went from a $19M seed in February 2025 to a $2 billion valuation in just over a year. That pace reflects real technical milestones, not hype cycles. ### Problem and Opportunity AI data centers are hungry for power, and the grid can’t keep up. Google, Microsoft, Amazon, and Meta have all signed nuclear power agreements. Permitting delays for new gas and renewable capacity stretch years. Small modular reactors offer a faster path to reliable baseload power, and Valar is racing to prove it. ### Product and Technology [Valar Atomics](https://www.valaratomics.com) builds clusters of small high-temperature gas-cooled reactors (HTGRs) using TRISO fuel, which carries inherent safety properties and proliferation resistance. Their Ward250 reactor has already achieved nuclear criticality, a milestone most competitors haven’t reached. In February 2026, the reactor was airlifted from California to Utah aboard three C-17 military cargo aircraft. The company is targeting operational power generation before July 4, 2026 under a DOE pilot program. ### Use of Proceeds and Vision Funds go toward completing Ward250 power operations in Utah, designing commercial-scale reactor clusters, and scaling manufacturing. Beyond electricity, Valar is also targeting clean hydrocarbon fuel production, which broadens the addressable market past data center power alone. ### Market Context The global SMR market sits at roughly $5.8 billion and is projected to reach $8.4 to $8.8 billion by the early 2030s. Competitors include NuScale Power (first NRC-certified SMR), Oklo (14 GW pipeline), Kairos Power (500 MW Google deal), TerraPower, and X-energy. Valar’s criticality milestone and defense-sector backing put it in a distinct lane. ## 2. EnerVenue Secures $300M for Grid-Scale Energy Storage ### Deal Overview - **Stage:** Series B Extension - **Sector:** Climate / Energy Storage - **Geography:** California - **Round Size:** $300M - **Total Raised:** $800M+ ### Investor Profile Full Vision Capital, the family office of Hong Kong billionaire Peter Lee Ka-kit, led the round. Prior backers include Schlumberger, Saudi Aramco’s venture arm, and Stanford University. The single-investor structure at this size suggests strong conviction and likely favorable terms for the company. ### Company and Leadership Dr. Yi Cui, a Stanford materials science professor, founded [EnerVenue](https://www.enervenue.com) in 2020. His breakthrough was making nickel-hydrogen battery chemistry, previously too expensive for anything but satellites, viable for terrestrial use. The company recently brought on Henning Rath as CEO. Rath previously helped build Enpal, a major German renewable energy company. ### Problem and Opportunity Lithium-ion batteries dominate grid storage but come with fire risk, degradation after a few thousand cycles, and dependence on critical minerals with volatile supply chains. Utilities and industrial operators need storage assets that last 20 to 30 years without those headaches. ### Product and Technology EnerVenue commercializes nickel-hydrogen batteries originally developed for NASA satellites. The cells use a water-based electrolyte, which means zero fire risk. They deliver up to 30,000 cycles compared to roughly 4,000 to 6,000 for lithium-ion in grid applications. They operate from -40°C to +50°C without HVAC and require virtually no maintenance over a 30-year lifespan. ### Use of Proceeds and Vision The capital scales their Changzhou, China factory to 250 MWh capacity by the end of 2026. The company is also investing in next-gen cell R&D and expanding commercially across Asia, the Middle East, and Europe. The long-term goal is gigawatt-scale production. ### Market Context Grid-scale battery storage is a $10.7 billion market projected to hit $44 billion by 2030. The long-duration energy storage segment alone should grow from $4.8 billion to $17.2 billion by 2035. Competitors in non-lithium storage include Form Energy (iron-air), ESS Inc. (iron flow), Ambri (liquid metal), and Invinity (vanadium flow). ## 3. Alcatraz Raises $50M for AI-Powered Access Control ### Deal Overview - **Stage:** Series B - **Sector:** Physical Security / Cybersecurity - **Geography:** Cupertino, California - **Round Size:** $50M - **Total Raised:** $100M+ ### Investor Profile BlackPeak Capital, Cogito Capital, and Taiwania Capital led the round, joined by returning investor Almaz Capital and the EBRD. The mix of Asian and European institutional capital reflects the company’s international expansion ambitions. ### Company and Leadership Vince Gaydarzhiev founded [Alcatraz](https://www.alcatraz.ai) in 2016 after leading hardware prototyping for iPad and iPhone at Apple during the Face ID era. Tina D’Agostin serves as CEO. The company has reported 300% year-over-year growth in data center adoption and a 5x expansion in Fortune 500 deployments during 2025. ### Problem and Opportunity Badge-based access control doesn’t scale for high-throughput environments like AI data centers and major airports. Badges get lost, shared, and stolen. As data center construction accelerates, operators need security that moves at the speed of foot traffic without creating bottlenecks. ### Product and Technology Alcatraz’s flagship product, called The Rock, authenticates people via facial recognition as they walk at normal speed. No badge, no PIN, no pause. The system stores anonymized facial vectors, not photographs. No biometric images hit the cloud. Enrollment is voluntary, and users can delete their data. It integrates with existing access control infrastructure and includes tailgating prevention. ### Use of Proceeds and Vision The company plans to expand into new verticals and international markets while deepening its footprint in data centers, airports, and large enterprise campuses. Their pitch is simple: replace the badge with your face. ### Market Context The global access control market is estimated at $11.4 to $13.8 billion in 2026, growing at about 7.7% annually. Badge and card incumbents like ASSA ABLOY, HID Global, and Honeywell still hold roughly 62% market share. Biometric access is the fastest-growing segment through 2033. ## 4. Linx Security Closes $50M for Identity Governance ### Deal Overview - **Stage:** Series B - **Sector:** Cybersecurity / Identity - **Geography:** New York (R&D in Tel Aviv) - **Round Size:** $50M - **Total Raised:** $83M ### Investor Profile Insight Partners led with Cyberstarts and Index Ventures participating. That’s the same investor syndicate behind Wiz, which sold to Google for $32 billion. When Cyberstarts backs an identity security startup with this level of conviction, enterprise buyers pay attention. ### Company and Leadership Israel Duanis (CEO) and Niv Goldenberg (CPO) founded [Linx Security](https://www.linx.security) in 2023. Both served in Israel’s elite Talpiot program over 20 years ago. Duanis previously co-founded Fleetonomy (acquired by Via in 2020) and led threat prevention at Check Point. The company has about 100 employees and emerged from stealth with a $27M Series A in mid-2024. ### Problem and Opportunity Identity is the most common attack vector in enterprise breaches. Legacy identity governance tools from SailPoint and Saviynt rely on periodic manual reviews that happen quarterly at best. Meanwhile, non-human identities like service accounts, API keys, and now AI agents are multiplying faster than security teams can track. ### Product and Technology Linx provides an AI-native identity security platform covering human, non-human, and AI agent identities. Their Linx Autopilot, launched ahead of RSA 2026, monitors identity environments around the clock, detects changes like new privileged access grants or department moves, evaluates risk in context, and either auto-remediates or escalates. It replaces periodic access reviews with continuous governance. ### Use of Proceeds and Vision The money funds global go-to-market expansion, product development around Autopilot, and team growth. The company has already signed multimillion-dollar contracts with banks, healthcare organizations, and Fortune 500 companies governing millions of identities. ### Market Context The identity governance market is roughly $10.7 billion in 2026, projected to reach $25 to $33 billion by the early 2030s. The broader IAM market should hit $65.7 billion by 2034. Newer competitors include Opal Security, Veza, and Authomize, but Linx’s autonomous remediation approach sets it apart from the pack. ## 5. Sift Secures $42M for Hardware Observability ### Deal Overview - **Stage:** Series B - **Sector:** AI / Infrastructure - **Geography:** El Segundo / Marina Del Rey, California - **Round Size:** $42M - **Total Raised:** $67M ### Investor Profile StepStone led the round with GV (Google Ventures), Riot Ventures, Fika Ventures, and CIV participating. GV’s continued backing from the Series A signals satisfaction with the company’s progress. The seed round attracted over 50 SpaceX alumni as angel investors, which says a lot about the product’s origin story. ### Company and Leadership Karthik Gollapudi (CEO) and Austin Spiegel founded [Sift](https://www.siftstack.com) in 2022 after working at SpaceX. Gollapudi led several Dragon missions, and Spiegel ran multiple engineering teams. They built the company to solve the telemetry data chaos they experienced firsthand. ### Problem and Opportunity Software has Datadog. Hardware has nothing comparable. Rockets, satellites, autonomous vehicles, and defense systems generate millions of data points per second from hundreds of sensors. That data sits in silos, unstructured and hard to query. As AI moves from processing text to controlling physical machines, this gap becomes a real bottleneck. ### Product and Technology Sift automatically transforms raw sensor data (audio, video, logs, high-frequency telemetry) into structured, queryable information. Their two core products are Sift Observability for real-time ingestion and analysis, and Sift Storage for managed pipelines and centralized storage. Customers include ULA, Astranis, K2 Space, Parallel Systems, and undisclosed defense programs. ### Use of Proceeds and Vision The company plans to nearly double its 70-person engineering team, move into a larger HQ in Marina Del Rey, and expand across space, defense, manufacturing, and autonomous systems. They’re building what they call the missing data layer for physical AI. ### Market Context Hardware observability is a new category with no direct equivalent competitor. Adjacent markets include APM/observability at $20 billion+, industrial IoT projected at $500 billion+ by 2030, and the space industry at $600 billion+ by 2030. The explosion in commercial space, defense modernization, and robotics all feed demand. ## 6. Barrell Lithium Closes $25M for Lithium Brine Development ### Deal Overview - **Stage:** Series B - **Sector:** Climate / Critical Minerals - **Geography:** Texas - **Round Size:** $25M ### Investor Profile Investor details for this round were not disclosed. The close was confirmed on April 2, 2026. ### Company and Leadership [Barrell Lithium](https://www.barrelllithium.com) is a Texas-based company exploring and developing lithium brine resources. The Series B close signals continued investor appetite for domestic critical mineral supply chains. ### Problem and Opportunity The US depends heavily on imported lithium for EV batteries and grid storage. Domestic brine extraction offers a path to reduce that dependency, and Texas sits on significant brine deposits that remain largely untapped. ### Product and Technology Barrell focuses on lithium brine extraction, a process that draws lithium from subsurface saltwater deposits. This approach typically has a lower environmental footprint than hard-rock mining and can leverage existing oil and gas infrastructure in Texas. ### Use of Proceeds and Vision The Series B funding supports continued exploration and development of the company’s lithium brine assets. ### Market Context Lithium demand continues to grow with EV adoption and grid storage deployment. US-based lithium projects benefit from IRA incentives favoring domestic critical mineral production. Competitors in direct lithium extraction include Standard Lithium, Lilac Solutions, and EnergyX. ## 7. ANEUVO Raises $22M for Neuromodulation Implants ### Deal Overview - **Stage:** Series C - **Sector:** Health Tech / Medical Devices - **Geography:** United States - **Round Size:** $22M ### Investor Profile Catcher Technology Co., a Taiwanese precision manufacturing firm, led the round. Strategic investment from a hardware manufacturer suggests supply chain alignment for scaling device production. ### Company and Leadership [ANEUVO](https://www.aneuvo.com) is a medical device company developing neuromodulation implants for spinal cord injury. Reaching Series C indicates the company has moved past early R&D into clinical and regulatory advancement. ### Problem and Opportunity Spinal cord injuries affect hundreds of thousands of people each year, with limited treatment options beyond physical therapy and symptom management. Neuromodulation, using electrical stimulation to restore function, represents one of the most promising therapeutic frontiers. ### Product and Technology ANEUVO develops implantable neuromodulation devices designed to help spinal cord injury patients recover motor function. The technology uses targeted electrical stimulation to activate neural pathways. ### Use of Proceeds and Vision The $22 million advances the company’s therapeutic devices through clinical development and toward regulatory milestones. ### Market Context The global neuromodulation market is valued at over $8 billion and growing steadily. Established players include Medtronic, Boston Scientific, and Abbott. Smaller innovators like Onward Medical and Nalu Medical are also pushing the field forward with next-generation spinal cord stimulation approaches. ## Lessons For Founders - **Technical milestones unlock outsized rounds.** Valar Atomics went from $130M to $450M after achieving nuclear criticality. Investors reward companies that retire technical risk with real demonstrations, not slide decks. - **NASA and military heritage translates to commercial credibility.** EnerVenue’s satellite battery chemistry and Sift’s SpaceX-born observability platform both attracted serious capital by commercializing technology proven in extreme environments. If your tech works in space, the pitch for terrestrial use practically writes itself. - **Privacy-first design is a growth strategy.** Alcatraz’s decision to store anonymized vectors instead of photos removed the surveillance objection that blocks most facial recognition deployments. Building privacy in from day one opened doors at airports, data centers, and Fortune 100 companies that would otherwise say no. - **The Wiz playbook is being replicated in identity.** Linx Security’s backers are the same syndicate that built Wiz, and they’re applying the same formula: take a legacy category (identity governance), rebuild it as AI-native, and go after enterprise contracts fast. Founders in adjacent security categories should study this pattern. - **Category creation requires patience and pedigree.** Sift is building “Datadog for hardware” in a market that barely exists yet. That’s a hard fundraise without the SpaceX credentials and blue-chip customer list to back it up. If you’re creating a category, your founder story and early customers have to do the heavy lifting.