YC Startups: Famous Alumni, Spring 2026 Picks, List Traps
YC startups are companies that went through Y Combinator, a seed accelerator. Here's which alumni the lists name, which Spring 2026 companies investors flagged, and where YC startups lists contradict their own numbers.
What are YC startups?
YC startups are companies that joined a Y Combinator (YC) batch. Startup Savant, in an article updated 17 March 2026, describes YC as a seed accelerator that works with companies for roughly three months and provides funding and pitch help.
VCBacked lists 48 batches, running from 2005 to 2026.
Batches get codes such as W26, which VCBacked uses for its newest listed group.
Being in a batch says little about later success, because the label covers very different companies.
People often use the phrase "YC startups" for any company with a YC link, whether a famous alumnus or a company still in its batch. Context usually decides which meaning applies. A Demo Day pick from 2026 and an alumnus founded in 2008 can both be called YC startups while sharing little else.
How many YC startups are there?
No single clean number exists in the pages we read. VCBacked, which shows no date but says it updates monthly, reports 6,302+ companies. Its own status lines don't add up to that.
VCBacked figure (undated, read Nov 2026) | Count |
Companies in database | 6,302+ |
Active | 5,056 |
Acquired | 596 |
Public | 24 |
Active + acquired + public | 5,676 |
That leaves about 626 companies unexplained. The page's table also repeats some names, so the headline count may include duplicates.
Batch sizes shift widely in the same data: W22 is listed at 505 companies, W21 at 395, W25 at 221 and W26 at 248. A common pattern is that database counts drift with each refresh, so quote them with a date.
Which YC startups stood out in Spring 2026?
YC held Spring 2026 Demo Day on 16 June, according to its own schedule.
Two days later, TechCrunch's Marina Temkin and Dominic-Madori Davis published a list. They spoke with eight investors, and it mainly includes companies that at least two of them called the buzziest from the Spring 2026 batch.
Startup | What TechCrunch says it does |
9 Mothers | AI-powered counter-drone systems; founded 2024 |
Ploy | Automates websites and marketing; raised a $27M seed led by First Round and Y Combinator |
Adialante | Truck-transportable MRI units charging $250 per scan |
Sazabi | AI platform that finds production problems and can submit fixes |
Superset | Runs 100 or more coding agents at once |
Tasklet | Always-on AI agent connected to work apps |
Five more were named:
Arga Labs builds digital twin environments where AI agents can test code before release.
Complir uses AI agents to handle compliance paperwork for physical products shipped abroad.
Dispatch plans reusable space vehicles that return manufactured goods to Earth.
Lightsprint lets non-engineers build features through an AI agent, with an engineer reviewing the code.
Silmaril sells security that protects AI agents from prompt injection, a trick that plants hostile instructions in the text an agent reads.
Most of the eleven YC startups sit in AI, which fits our look at top AI startups.
Treat the numbers with care. 9 Mothers has $1.6M in sales and a contract expected to grow to $35M, and one investor put its valuation above $200M. The company didn't comment.
TechCrunch also says at least two startups in the batch were valued at $175M or more. Those are investor estimates, not filings.
Investor buzz tends to follow repeat founders, and TechCrunch says investors paid premiums for proven ones. Buzz at Demo Day is a signal about attention, not a measure of results.
Which well-known companies do lists call YC startups?
Startup Savant's list of YC startups names 20 companies and says it isn't ranked or exhaustive. By its own location data, 15 of the 20 are in California, which is why our top startups in California page overlaps with YC lists.
Company | Location (as listed) | Founded | Funding as listed |
Airbnb | San Francisco | 2008 | $6.4B |
Coinbase | San Francisco | 2012 | $498.7M |
Meesho | Bangalore, India | 2015 | $1.1B |
Rappi | Bogota, Colombia | 2015 | $2.3B |
Webflow | San Francisco | 2013 | $334.9M |
Duffel | London, UK | 2017 | $56.2M |
These funding totals are undated and unsourced on the page, so use them as pointers only. We left out Instacart because the page lists its funding at $2.9M, which looks far too low for a company of that scale.
Some links on that page are affiliate links, and the page admits it. A pattern readers often notice is that affiliate-driven lists favor products with sign-up programs, not necessarily the strongest companies.
What kinds of YC startups lists exist?
The three pages we read are three different products, and mixing them up causes most confusion.
Alumni highlights, such as Startup Savant's 20 YC startups, which pick familiar names.
Current-batch picks, such as TechCrunch's June 2026 list of Spring 2026 YC startups chosen by investors.
Databases, such as VCBacked, which try to cover every company and sell access to contacts.
Each answers a different question. A reader who wants established YC startups shouldn't use a Demo Day roundup, and a reader tracking the newest batch shouldn't rely on an alumni article last updated in March 2026.
What do the lists say about how YC startups turn out?
VCBacked sorts 5,676 companies by status. Of those, 5,056 are active (about 89%), 596 are acquired (about 10.5%) and 24 are public (under half a percent).
The status lines we saw have no category for companies that shut down, and "active" isn't defined. So these shares describe what the page chose to show, not a survival rate for YC startups. A pattern readers often report is that outcome tables quietly leave out failures.
How reliable are lists of YC startups?
Each list of YC startups we read contradicts itself somewhere. The table below collects the contradictions, which double as a checklist.
Problem | Example | Page |
Counts don't reconcile | 5,676 status total against 6,302+ companies | VCBacked |
Duplicate rows | Some companies repeat in the table | VCBacked |
Undated valuations | Airbnb "$75B+" and Stripe "$65B+" with no date | VCBacked |
Wrong category | Matterport tagged "Video Games" | Startup Savant |
Date mismatch | The Athletic founded 2015 in the header, 2016 in the text | Startup Savant |
Batches per year | FAQ says two; YC's 2026 schedule lists four Demo Days | VCBacked |
Membership not checked | The page doesn't verify each company's YC status | Startup Savant |
Why do YC startups lists disagree on batches and counts?
VCBacked says YC runs two batches a year, yet it lists X25 and X26 beside the W batches without explaining the extra code. YC's own Demo Day schedule, posted 18 December 2025, lists four for 2026, after the expansion from two cohorts a year that was reported by Bloomberg in September 2024.
Winter: 24 March
Spring: 16 June
Summer: 10 September
Fall: 2 December
That page uses season names, not letter codes.
So VCBacked's two-a-year line looks out of date, and we couldn't tell what X means. Check a company with YC itself before repeating a claim that it's one of the YC startups. Coinbase, which Startup Savant's list names, listed directly on Nasdaq in April 2021, according to CNBC.
Commercial interest matters too. VCBacked sells paid plans from $79 per month, and its superlatives such as "most complete" come with no comparison.
What to do next
Treat any YC startups list as a starting point. Choose one company, confirm its batch and status on a primary source, and note the date. Then compare two YC startups lists on a single metric before trusting either.
Frequently asked questions
What are YC startups?
They're companies that went through Y Combinator, a seed accelerator. Startup Savant says the program lasts roughly three months and offers funding and pitch help.
How many YC startups are there?
VCBacked reports 6,302+ companies across 48 batches, but its status counts total 5,676. Treat the count as approximate and dated.
Which YC startups did investors flag in Spring 2026?
TechCrunch, on 18 June 2026, named 11, including 9 Mothers, Ploy, Adialante, Sazabi, Superset and Tasklet, based on eight investors' views.
Are lists of YC startups reliable?
Not without checking. The pages we read contain mismatched counts, wrong categories and undated valuations, so confirm each claim on a primary source.