Why Startups Fail: Top 9 Reasons l CB Insights
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The top 9 reasons startups fail
From running out of cash to legal troubles, we break down the top 9 reasons for startup failure by analyzing 400+ post-mortems.
March 5, 2026
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March 5, 2026
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Top startup failures
Download the book of post-mortems to get CB Insights data and analysis on the top startup failures since 2023.
First Name<br>Last Name<br>Email<br>Company Name<br>Job Title<br>Phone Number
Startup failures rarely come down to a single cause. But they do follow patterns.
We analyzed public post-mortems, founder interviews, and shutdown announcements from 431 VC-backed companies that shut down since 2023 in the post-zero-interest-rate shakeout. “Ran out of capital” tops the list at 70%, but it’s almost always the final cause of death, not the root problem.
Here’s what CB Insights data shows.
Why do startups fail?
Capital running out is where these stories end. The more telling causes — poor product-market fit (43%), bad timing (29%), and unsustainable unit economics (19%) — reveal why the capital dried up in the first place.
Since many startups cited multiple reasons for their failure, the chart below exceeds 100%. The analysis includes 385 companies for which failure reasons could be identified.
Track live data on recent startup failures
Two-thirds of product-market fit (PMF) failures were early-stage companies that never found a market. But 20 Series B+ companies also cited poor PMF as a primary cause. Those later-stage companies raised on early traction that never widened into a real market. Zume ($446M, Series C), which pivoted from robot-made pizza to sustainable packaging and still failed to find a viable market, is one example.
Bad timing or macro conditions drove a disproportionate share of failures in climate & energy, food & agriculture, and blockchain. These sectors attracted heavy capital in 2021-2022 on trends that never materialized. For example, New Age Meats ($32M) and RECUR ($55M) raised at the peak of the alt-protein and NFT waves respectively, and both shut down when the market didn’t follow through.
How we built this report
Using the CB Insights platform, we identified 431 VC-backed startups that publicly shut down since 2023, excluding companies that had a prior exit. We then categorized the companies (with sufficient data) by primary reasons for failure. Then, we leveraged CBI signals, such as Mosaic health & potential scores and business relationships, to surface key patterns across the cohort.
Top startup failures
Download the book of post-mortems to get CB Insights data and analysis on the top startup failures since 2023.
First Name<br>Last Name<br>Email<br>Company Name<br>Job Title<br>Phone Number
What are the warning signs?
While founders cite a range of causes in shutdown post-mortems, CB Insights’ predictive signals show measurable deterioration in company health and activity in the months leading up to shutdown.
Mosaic declines: CB Insights’ Mosaic score, a proprietary measure of private company health and potential scored 0 to 1,000, shows a deterioration curve in dead companies. Among companies...