Yotam Segev
About Yotam Segev
Yotam Segev is an individual investor, not an institutional firm. We found no public fund, management company or partner team. He is co-founder and CEO of Cyera, and Crunchbase lists him in New York. Crunchbase also says he previously headed the cyber department at Israeli Military Intelligence. Cyera was reported in 2026 to be valued at more than $12 billion after a Series G extension, and its co-founder is Tamar Bar-Ilan. Segev's startup investing runs alongside his day job at Cyera. Crunchbase lists 6 personal investments, and Tracxn lists fewer, so counts differ by database.
Segev appears on cap tables as an angel next to other Israeli security founders such as Assaf Rappaport of Wiz. His disclosed rounds sit close to Cyera's own market of enterprise security and data for AI. In 2026 he joined Upriver's $14M seed, led by Valley Capital Partners and Hetz Ventures, and NewCore's $66M seed. NewCore's seed was backed by Cyberstarts, Index Ventures and Evolution Equity Partners, and its product secures human, machine and AI agent identities. Press also lists him as an angel in A Security, which builds AI agents to simulate and block autonomous cyberattacks, and in the cyber startup Spirit. We found no public investment thesis from him.
Every disclosed round we found is early stage: seed rounds at Upriver and NewCore, plus follow-on and growth rounds at A Security and Spirit where he joined other backers. He does not lead these rounds. Angel check sizes are not public, and we found no fund size or ownership targets. Founders should treat him as a strategic angel with security and enterprise data expertise. They should not expect a lead investor or a set cheque range.
- Upriver: AI-native data engineering platform that automates data pipelines and fixes data quality issues for AI projects. $14M seed in 2026.
- NewCore: Tel Aviv identity security platform for humans, machines and AI agents. $66M seed in 2026.
- A Security: Israeli startup building AI agents to detect, simulate and block autonomous cyberattacks. Reported $37M raise with Cyberstarts and Lightspeed leading.
- Spirit: cyber startup reported to be valued at $400M in a $50M round led by Cyberstarts and Sequoia Capital.
- crunchbase.com/person/yotam-segev-9f92
- ynetnews.com/business/article/bjuyzwuzfe
- securityweek.com/newcore-emerges-from-stealth-mode-with-66-million-in-
- en.globes.co.il/en/article-israeli-workforce-identity-co-newcore-raise
- thenextweb.com/news/newcore-66-million-ai-agent-identity-security
- calcalistech.com/ctechnews/article/sj3rrxnbzx
- x.com/Calcalistech/status/2008438236952113184
- x.com/TradedVC/status/2102524787872387247
Investing activity
Yotam Segev appears in 2 AI deals tracked by the Lounge deals desk, rounds totalling $80M. The rounds are mostly Seed, with a median round size of $66M. The most recent are NewCore (Seed, $66M, Jun 2026) and Upriver (Seed, $14M, Jun 2026).
Yotam Segev most often invests alongside Cyberstarts, Index Ventures, Evolution Equity Partners and Yevgeny Dibrov, and the companies it backs on Lounge are mostly in AI.
Deals
Frequently asked questions about Yotam Segev
Is Yotam Segev a venture capital firm?
No. Yotam Segev is the co-founder and CEO of Cyera and invests as an individual angel. We found no public fund, fund size or partner team.
What AI startups has Yotam Segev invested in?
Public reports name Upriver and NewCore, both 2026 seed rounds, and also A Security and Spirit. Crunchbase lists 6 personal investments in total.
What stage does Yotam Segev invest in?
The rounds we found are early stage, mostly seed. He joins as one angel among institutional leads and is not named as a lead investor.
How much does Yotam Segev invest per startup?
Check sizes are not public. We found no stated range, and press reports only give total round sizes.
Should AI security founders pitch Yotam Segev?
His disclosed investments centre on security and AI infrastructure, which matches Cyera's market. Founders in those areas, especially Israeli-linked teams, may find him a relevant angel.
What AI companies has Yotam Segev invested in?
Yotam Segev's AI investments include NewCore and Upriver. The 2 rounds on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Yotam Segev invest at?
In the rounds tracked on Lounge, Yotam Segev has invested at Seed, with a median round of $66M.
Who does Yotam Segev co-invest with?
Yotam Segev's most frequent co-investors on Lounge are Cyberstarts (1 deal), Index Ventures (1 deal), Evolution Equity Partners (1 deal), Yevgeny Dibrov (1 deal) and Ofer Ben Noon (1 deal).
How can founders reach Yotam Segev?
Founders on Lounge can see Yotam Segev's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add Yotam Segev to their Investor Pipeline to track the conversation.