Spark Thermionics
HardwareFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Spark Thermionics develops thermionic energy technology for a chip-scale power plant.
First Round Capital
Explore the companies in our sourced portfolio selection. Find the product, inspect the evidence, and make your own picks.
- Companies tracked
- 177
- Shared with other tracked firms
- 34
This is a curated selection, not the complete portfolio. A company’s first observation is separate from its investment date.Visit First Round Capital’s official portfolio ↗
Portfolio progress
Tracking started .
Source check heldLast source:
- Companies in selection
- 177
- Companies with new milestones
- 78
- New milestones since tracking began
- 78
Successful observations only. Changes show additions to this curated selection, not new investment dates or financial growth.
View daily observations
| Date | Selection | Reconfirmed in this check |
|---|---|---|
| Oct 31, 2026 | 177 | 177 |
| Nov 1, 2026 | 177 | 177 |
Latest observation: Nov 1, 2026. 177 of 177 companies reconfirmed across 1 source pages. Coverage is partial. A missing event does not establish inactivity. No share prices or fund returns are estimated.
Sources behind the latest observation
- www.firstround.com ↗Captured Nov 1, 2026 · SHA-256 ea905a5b8357
Inspect new milestones (78)
Labelbox · Measured growth
Nov 2, 2026 · Tranco popularity rank: 101,895 → 101,865 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Persona · Measured growth
Nov 2, 2026 · Tranco popularity rank: 12,826 → 12,737 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗OnDeck Capital · Measured growth
Nov 7, 2026 · Tranco popularity rank: 163,640 → 159,870 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Tesorio · Measured growth
Nov 7, 2026 · Tranco popularity rank: 585,628 → 557,209 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Woolf · Measured growth
Nov 2, 2026 · Tranco popularity rank: 389,460 → 384,026 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Clover Health · Measured growth
Nov 2, 2026 · Tranco popularity rank: 228,609 → 226,769 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Omnea · Measured growth
Nov 7, 2026 · Tranco popularity rank: 467,834 → 435,046 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Odeko · Measured growth
Nov 7, 2026 · Tranco popularity rank: 891,467 → 849,129 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗The Climate Corporation · Measured growth
Nov 2, 2026 · Tranco popularity rank: 157,685 → 157,620 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Swift Navigation · Measured growth
Nov 2, 2026 · Tranco popularity rank: 57,227 → 56,501 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗RebelMouse · Measured growth
Nov 2, 2026 · Tranco popularity rank: 24,106 → 24,054 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Uber · Measured growth
Nov 2, 2026 · Tranco popularity rank: 707 → 705 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Castle · Measured growth
Nov 7, 2026 · Tranco popularity rank: 37,845 → 36,920 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Aisera · Measured growth
Nov 7, 2026 · Tranco popularity rank: 313,302 → 311,648 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Mirror · Measured growth
Nov 2, 2026 · Tranco popularity rank: 358,903 → 357,886 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Perpay · Measured growth
Nov 2, 2026 · Tranco popularity rank: 102,176 → 101,274 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Flex · Measured growth
Nov 2, 2026 · Tranco popularity rank: 204,203 → 201,729 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Stensul · Measured growth
Nov 7, 2026 · Tranco popularity rank: 300,141 → 287,909 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Looker · Measured growth
Nov 2, 2026 · Tranco popularity rank: 10,203 → 10,096 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Manifest Law · Measured growth
Nov 2, 2026 · Tranco popularity rank: 488,570 → 486,303 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Rupa Health · Measured growth
Nov 2, 2026 · Tranco popularity rank: 209,620 → 209,404 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗UrbanSitter · Measured growth
Nov 2, 2026 · Tranco popularity rank: 253,125 → 251,381 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗JetInsight · Measured growth
Nov 2, 2026 · Tranco popularity rank: 467,422 → 465,526 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Candid · Measured growth
Nov 7, 2026 · Tranco popularity rank: 269,773 → 263,963 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Vital · Measured growth
Nov 2, 2026 · Tranco popularity rank: 408,201 → 401,606 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Legl · Measured growth
Nov 2, 2026 · Tranco popularity rank: 484,940 → 479,407 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Crossbeam · Measured growth
Nov 2, 2026 · Tranco popularity rank: 201,784 → 200,689 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Ploy · Measured growth
Nov 2, 2026 · Tranco popularity rank: 303,692 → 303,275 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗K2 Space · Measured growth
Nov 2, 2026 · Tranco popularity rank: 529,060 → 523,418 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Unblocked · Measured growth
Nov 2, 2026 · Tranco popularity rank: 347,787 → 345,706 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Flatiron Health · Measured growth
Nov 2, 2026 · Tranco popularity rank: 145,107 → 143,798 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗SingleStore · Measured growth
Nov 2, 2026 · Tranco popularity rank: 125,730 → 124,119 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Iru · Measured growth
Nov 2, 2026 · Tranco popularity rank: 124,337 → 123,077 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Gumloop · Measured growth
Nov 2, 2026 · Tranco popularity rank: 149,276 → 147,742 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Together AI · Measured growth
Nov 2, 2026 · Tranco popularity rank: 40,626 → 40,314 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Goose · Measured growth
Nov 3, 2026 · Tranco popularity rank: 313,652 → 313,149 (retained index observations 2026-11-01 to 2026-11-03). Lower ranks indicate higher relative popularity.
Milestone source ↗Gumroad · Measured growth
Nov 3, 2026 · Tranco popularity rank: 2,925 → 2,922 (retained index observations 2026-11-01 to 2026-11-03). Lower ranks indicate higher relative popularity.
Milestone source ↗Pantheon · Measured growth
Nov 2, 2026 · Tranco popularity rank: 11,799 → 11,683 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Parallel · Measured growth
Nov 2, 2026 · Tranco popularity rank: 57,365 → 57,074 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Steno · Measured growth
Nov 2, 2026 · Tranco popularity rank: 178,270 → 176,730 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Glide · Measured growth
Nov 2, 2026 · Tranco popularity rank: 86,809 → 86,359 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗GroupMe · Measured growth
Nov 2, 2026 · Tranco popularity rank: 6,286 → 6,273 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Prepared · Measured growth
Nov 2, 2026 · Tranco popularity rank: 330,449 → 328,812 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Studs · Measured growth
Nov 2, 2026 · Tranco popularity rank: 345,366 → 344,570 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Assort Health · Measured growth
Nov 2, 2026 · Tranco popularity rank: 675,714 → 674,681 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗eero · Measured growth
Nov 2, 2026 · Tranco popularity rank: 23,222 → 22,711 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Guide · Measured growth
Nov 2, 2026 · Tranco popularity rank: 400,914 → 388,129 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Crossmint · Measured growth
Nov 2, 2026 · Tranco popularity rank: 342,622 → 341,652 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Reducto · Measured growth
Nov 2, 2026 · Tranco popularity rank: 333,093 → 332,201 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Suki · Measured growth
Nov 2, 2026 · Tranco popularity rank: 209,726 → 208,361 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗fal · Measured growth
Nov 2, 2026 · Tranco popularity rank: 40,032 → 39,532 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Laurel · Measured growth
Nov 2, 2026 · Tranco popularity rank: 96,095 → 95,213 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Smartling · Measured growth
Nov 2, 2026 · Tranco popularity rank: 14,250 → 14,191 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Arketa · Measured growth
Nov 2, 2026 · Tranco popularity rank: 190,940 → 190,887 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Serval · Measured growth
Nov 2, 2026 · Tranco popularity rank: 161,000 → 158,427 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Stedi · Measured growth
Nov 2, 2026 · Tranco popularity rank: 56,043 → 55,920 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Board · Measured growth
Nov 2, 2026 · Tranco popularity rank: 857,926 → 850,511 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Ownwell · Measured growth
Nov 2, 2026 · Tranco popularity rank: 307,579 → 305,914 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗KiwiCo · Measured growth
Nov 2, 2026 · Tranco popularity rank: 96,530 → 96,328 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Planet · Measured growth
Nov 2, 2026 · Tranco popularity rank: 21,254 → 21,053 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Alma · Measured growth
Nov 7, 2026 · Tranco popularity rank: 29,966 → 28,930 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Superhuman · Measured growth
Nov 2, 2026 · Tranco popularity rank: 10,614 → 10,547 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Spline · Measured growth
Nov 2, 2026 · Tranco popularity rank: 41,820 → 41,556 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Wonderschool · Measured growth
Nov 2, 2026 · Tranco popularity rank: 263,239 → 261,855 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Upstart · Measured growth
Nov 2, 2026 · Tranco popularity rank: 8,421 → 8,404 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Town · Measured growth
Nov 2, 2026 · Tranco popularity rank: 150,464 → 147,644 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Snackpass · Measured growth
Nov 3, 2026 · Tranco popularity rank: 261,724 → 258,138 (retained index observations 2026-11-01 to 2026-11-03). Lower ranks indicate higher relative popularity.
Milestone source ↗Clearbit · Measured growth
Nov 7, 2026 · Tranco popularity rank: 24,127 → 23,840 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Numerai · Measured growth
Nov 2, 2026 · Tranco popularity rank: 194,875 → 194,214 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗The Black Tux · Measured growth
Nov 7, 2026 · Tranco popularity rank: 179,453 → 178,601 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗Highlight · Measured growth
Nov 2, 2026 · Tranco popularity rank: 295,113 → 294,706 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Warby Parker · Measured growth
Nov 2, 2026 · Tranco popularity rank: 24,578 → 24,534 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗nGram · Measured growth
Nov 2, 2026 · Tranco popularity rank: 710,458 → 709,488 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗One Safe · Measured growth
Nov 2, 2026 · Tranco popularity rank: 297,435 → 296,037 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Grokker · Measured growth
Nov 2, 2026 · Tranco popularity rank: 350,402 → 349,232 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗Nomad Health · Measured growth
Nov 3, 2026 · Tranco popularity rank: 866,429 → 866,055 (retained index observations 2026-11-01 to 2026-11-03). Lower ranks indicate higher relative popularity.
Milestone source ↗Alt · Measured growth
Nov 2, 2026 · Tranco popularity rank: 153,729 → 152,123 (retained index observations 2026-11-01 to 2026-11-02). Lower ranks indicate higher relative popularity.
Milestone source ↗RenoFi · Measured growth
Nov 7, 2026 · Tranco popularity rank: 279,715 → 259,857 (retained index observations 2026-11-01 to 2026-11-07). Lower ranks indicate higher relative popularity.
Milestone source ↗
Dated source activity (0)
These are the dates reported by the sources. Earlier events are historical evidence, separate from tracking progress.
No dated events are recorded in this selection yet.
177 companies in this selectionShowing 145–168
Open My Fund →Limited coverage
Spline
ConsumerFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Spline makes browser-based tools for interactive design.
Sprig
EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Sprig provides customer research tools for measuring experiences and exploring product opportunities.
Spur
AI; EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Spur checks user interfaces for errors and usability problems.
Square
Consumer; Enterprise; FintechFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Square provides point-of-sale tools for in-person and online sellers.
Stedi
HealthcareFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Stedi offers healthcare transaction APIs and clearinghouse services.
Steno
EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Steno provides court reporting and litigation support services to legal teams.
Stensul
EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Stensul makes email and landing page tools for marketers.
Studs
ConsumerFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Studs offers ear piercing services and sells earrings.
Suki
AI; HealthcareFirst tracked for this firm 31 Oct 2026
Company website description
Suki's Ambient Clinical Intelligence platform automates clinical documentation, reducing burnout and giving clinicians more time with their patients.
Product description source ↗Superhuman
AI; Consumer; EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Superhuman offers an AI assistant for agents in existing tools.
Swift Navigation
EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Swift Navigation offers automotive positioning software that combines satellite and vehicle sensor data.
Tesorio
Enterprise; FintechFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Tesorio supplies finance teams with AI agents for collections and payment operations.
The Black Tux
ConsumerFirst tracked for this firm 31 Oct 2026
RiseFinder summary
The Black Tux rents and sells formalwear online.
The Climate Corporation
EnterpriseFirst tracked for this firm 31 Oct 2026
Company website description
Make data-driven decisions on your farm with Climate FieldView, the all-in-one digital farming solution that helps growers like you maximize your results.
Product description source ↗Theseus
EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Theseus builds visual positioning software for drones operating without GPS.
Thirty Madison
HealthcareFirst tracked for this firm 31 Oct 2026
Product details not available yet. Visit the company website to research its product.
Together AI
AI; DevTools & InfraFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Together AI provides infrastructure for generative media and model development.
Town
AIFirst tracked for this firm 31 Oct 2026
Company website description
The unusually helpful AI work assistant. Your Townie works across inboxes, calendars, chats, and apps, learning your people, projects, and voice.
Product description source ↗Uber
ConsumerFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Uber for Business provides tools for managing organizational travel and meals.
Unblocked
DevTools & Infra; EnterpriseFirst tracked for this firm 31 Oct 2026
RiseFinder summary
Unblocked provides context for agents working on software development.
Upstart
AI; FintechFirst tracked for this firm 31 Oct 2026
Product details not available yet. Visit the company website to research its product.
UrbanSitter
ConsumerFirst tracked for this firm 31 Oct 2026
Product details not available yet. Visit the company website to research its product.
Verkada
Enterprise; HardwareFirst tracked for this firm 31 Oct 2026
Company website description
Modern, cloud-managed security cameras, access control, and smart building solutions in a single, fully integrated security system. Free 30-day trial. Easy setup.
Product description source ↗