VC Deal Flow — Week of June 22-28, 2026

Coverage window: June 22-28, 2026. This issue includes public announcements where a16z, Sequoia, Y Combinator, or Founders Fund were explicitly named as investors. Valuations are included only when the source disclosed them.

What moved this week

The tracked funds showed up in 11 confirmed financing announcements, with roughly $1.25 billion of disclosed round value. The week split into two clear lanes: very large infrastructure/defense checks, and a dense set of vertical AI application rounds.

Largest round: Stark Defence raised €500 million, led by Sequoia and Founders Fund, at a €3.2 billion valuation. 1
a16z's busiest lane: AI infrastructure and vertical AI, including Mirendil, Netris, Ornn, Prosper AI, and Probook. 2 3 4 5 6
Sequoia's week: Stark, Probook, Sail Research, and Engram all named Sequoia in the financing. 7 8 9
YC appeared mainly as a participant, not lead: Taktile, Warp, and JustAI all included YC in syndicates led by other investors. 10 11 12
Exits: No IPO, acquisition, or public-market debut tied to the four tracked investors passed the confirmation bar this week.

Deal table

Sector	Company	Round	Tracked investor signal	Company one-liner	Valuation
Defense / robotics	Stark Defence	€500M growth round	Sequoia and Founders Fund led; NATO Innovation Fund and others participated	Berlin-based defense startup building kamikaze drones and scaling European manufacturing capacity	€3.2B 1
AI R&D infrastructure	Mirendil	$200M seed	a16z led; Kleiner Perkins, Nvidia, and others participated	Platform for automating parts of AI research and helping scientists run model work	$1B 13
AI memory / infrastructure	Engram	$98M financing	Round led by Kleiner Perkins, General Catalyst, and Sequoia, with individual AI investors	Enterprise AI memory layer intended to reduce token usage and improve real-time adaptation	$600M 9
AI agent infrastructure	Sail Research	$80M seed + Series A	Sequoia led the Series A; Kleiner Perkins led the seed	Cloud platform for running long-horizon AI agents at lower inference cost	$450M 8
FinTech / AI decisioning	Taktile	$110M Series C	YC participated; Goldman Sachs Alternatives led	AI decision automation platform for banks and insurers	Not disclosed 10
HR / payroll AI	Warp	$60M Series B	YC participated; Battery Ventures led	AI-native payroll, HR, compliance, benefits, and IT platform for startups and mid-market companies	Not disclosed 11
Home services AI	Probook	$40M total announced: $34M Series A + $6M seed	a16z led the Series A; Sequoia led the seed and joined the Series A	AI operating system for home-service operators, built around dispatch	Not disclosed 7
Compute markets / crypto infra	Ornn	$33M seed	a16z crypto announced the investment; SiliconANGLE reported the round also included Galaxy Ventures and others	Marketplace and price index for buying, selling, and hedging AI compute capacity	Not disclosed 14
Healthcare AI	Prosper AI	$30M Series A	a16z led	AI-native platform for specialty-clinic scheduling, insurance verification, and billing workflows	Not disclosed 6
AI network automation	Netris	$15M Series A	a16z led	Network automation and multi-tenancy software for GPU clouds and large AI data centers	Not disclosed 15
Marketing AI	JustAI	$17M Series A	YC participated; Base10 led, with Peak XV also in the round	Agentic marketing platform for personalization, experimentation, decisioning, and measurement	Not disclosed 12

Sector read-through

AI infrastructure is splitting into deeper layers

This was not another week of generic model-wrapper rounds. Mirendil is trying to automate AI research itself, Sail is lowering the runtime cost of long-horizon agents, Netris is attacking GPU-cloud networking, Ornn is financializing compute capacity, and Engram is trying to make enterprise AI remember without repeatedly burning tokens. The shared bet: AI's bottlenecks are moving from model access to the systems around model work.

The round sizes support that point. Mirendil's $200 million seed at a $1 billion valuation and Sail's $80 million at a $450 million valuation show investors underwriting infrastructure companies before the market has settled on standard architectures. 13 8

Defense tech delivered the week's biggest top-four check

Stark's €500 million raise was the only Founders Fund check that passed this week's public confirmation bar, and it also brought Sequoia into the same round. Bloomberg reported that the financing valued Stark at €3.2 billion and that the proceeds support European military technology manufacturing; Sifted separately reported that Stark plans to direct more than 80% of the capital into R&D and manufacturing capacity. 1 16

Vertical AI moved from demos to operational systems

Probook, Prosper AI, Taktile, Warp, and JustAI all sell into messy operational workflows: dispatch, clinic phone operations, financial decisions, payroll/compliance, and enterprise marketing. These are not broad productivity claims; each company is pitching workflow ownership in a specific back office. The tracked-fund signal is strongest where the software either closes the loop itself or sits on a decision point with measurable economic impact. 2 6 10

Fund-by-fund check-in

Fund	Confirmed public check-ins this week	Notes
a16z	5	Led or announced investments in Prosper AI, Probook, Mirendil, Netris, and Ornn. The center of gravity was AI infrastructure plus vertical AI applications.
Sequoia	4	Co-led Stark, led Probook's seed and joined the Series A, led Sail's Series A, and was named among Engram's leading investors.
YC	3	Appeared as a participant in Taktile, Warp, and JustAI; no YC-led priced round surfaced.
Founders Fund	1	Co-led Stark with Sequoia; no other newly announced Founders Fund check passed the public confirmation bar.

Watch points for next week

Compute financing is becoming a theme, not a one-off. Ornn, Netris, Sail, and Mirendil all sit near the capital-intensive side of AI. Follow whether more rounds move from software margins toward physical infrastructure exposure.
Defense valuations remain fast-moving. Stark's round roughly puts European defense manufacturing in late-stage venture territory, and the next useful signal will be customer concentration: NATO member contracts versus direct Ukraine exposure.
YC follow-on rounds are broadening beyond developer tools. Taktile, Warp, and JustAI suggest YC alumni continue to raise in regulated or operationally complex categories where AI agents can own repetitive decisions.

Exits and exclusions

No qualifying top-four exit was confirmed in this week's final source set. A few large AI and infrastructure items surfaced during discovery but were left out when the source did not clearly confirm participation from a16z, Sequoia, YC, or Founders Fund in the announced transaction, or when the announcement was product news rather than a new financing event.