--- title: "August 19–20 VC News: Castelion $13B, ALSO $150M, YC GPU" description: "Aug 19–20, 2026: Castelion $1B Series C at $13B ($800M equity + $250M revolver), Rivian spinout ALSO $150M Series D, Thunder Compute $13M (YC), plus Navi, Rundoo, Network Bio, Relativity Networks, and Peeko. Centralize’s $19M is July 29, not new August tape." date: 2026-08-20T00:00:00.000Z tags: ["2026-vc-news", "startup-funding", "venture-capital", "market-analysis", "defense-tech", "climate-tech"] source: https://venturecapitaltracker.com/2026-august-19-20-investment-news-hypersonics-mobility-yc --- # August 19–20 VC News: Castelion $13B, ALSO $150M, YC GPU > Aug 19–20, 2026: Castelion $1B Series C at $13B ($800M equity + $250M revolver), Rivian spinout ALSO $150M Series D, Thunder Compute $13M (YC), plus Navi, Rundoo, Network Bio, Relativity Networks, and Peeko. Centralize’s $19M is July 29, not new August tape. **August 19–20, 2026 is the physical-production tape** the mid-month AI mega-rounds crowded out. [Castelion](/startup/castelion) printed **$13B**. [ALSO](/startup/also-mobility) added **$150M**. [Y Combinator](/fund/y-combinator) showed up on **Thunder Compute**. For the month map, use [August 2026 VC news](/2026-august-vc-news). Last verified **August 20, 2026**. ## Snapshot table | Company / firm | Amount | Stage | Key capital | Job | | --- | --- | --- | --- | --- | | [Castelion](/2026-castelion-1b-series-c-13b-hypersonics) | $800M equity + $250M revolver @ **$13B** | Series C | JPM; [a16z](/fund/andreessen-horowitz); Carlyle | Hypersonic missile production | | [ALSO](/2026-also-150m-series-d-rivian-spinout) | $150M | Series D | Prysm; Eclipse, Greenoaks, MVP | Small EVs + delivery autonomy | | Thunder Compute | $13M | Series A | Matrix; [YC](/fund/y-combinator); CEAS | GPU virtualization | | Navi | $100M | First institutional | Prosus | India fintech / pre-IPO | | Network Bio | $50M | Launch financing | Section 32, Thiel Bio, [Founders Fund](/fund/founders-fund) | Tissue + clinical AI | | Rundoo | $30M @ (total $48M) | Series B | [Battery](/fund/battery-ventures); [Bessemer](/fund/bessemer-venture-partners), [CRV](/fund/crv) | Supply-store OS | | Relativity Networks | $22M SAFE | Pre-priced | Rhapsody, Bell Ventures, Faster Than Glass | Data-center fiber | | Peeko | ₹67.4 cr | Series A | Chiratae; Stellaris | India babycare | Amounts from company posts or named press. Navi’s **~$1.3B** mark is **people-familiar** (TechCrunch), not a company number. ## Theme 1 — Factories got the largest checks **[Castelion](/2026-castelion-1b-series-c-13b-hypersonics)** is the day’s dominant print: **$13 billion**, **August 19**, **$800 million equity** plus a **$250 million** revolver. Google still ranks the **$350 million Series B**. Live mark is the C. Entity was stuck on Series B in our directory — now updated. Same Southern California munitions week: [Neros](/startup/neros-technologies) **$2.5B** (Aug 11), [Heaviside](/startup/heaviside-industries) **$600M** (Aug 12). Do not mash those marks. **[ALSO](/2026-also-150m-series-d-rivian-spinout)** is the mobility twin: **$150 million D**, Prysm, **no valuation**, launch-edition bikes **only now shipping**. **Not** ALSO Holding AG (SIX: ALSN). ## Theme 2 — YC and GPU efficiency, not another training cluster **Thunder Compute** posted **$13 million Series A** on **August 19** ([company](https://www.thundercompute.com/blog/thunder-compute-series-a)). **Matrix Partners** led (also led seed). [YC](/fund/y-combinator) and CEAS participated. Company: virtualize GPUs as network resources; cites Cast AI’s **~5%** average GPU utilization; **10,000+** users on its self-serve cloud; **$200 billion** idle-capacity language is **company framing**, not a measured TAM we audited. This sits next to [Groq](/startup/groq)’s Aug 17 **neocloud** print — different product (virtualization software vs megawatts). **$13 million** does not need a standalone memo; branded search is the product, not the round. ## Smaller verified items **Navi** — Flipkart co-founder Sachin Bansal’s Bengaluru fintech took **$100 million from Prosus**, first institutional money in eight years ([TechCrunch](https://techcrunch.com/2026/08/19/sachin-bansals-fintech-navi-raises-first-outside-capital-with-100m-prosus-investment/)). Subject to closing conditions and regulatory approvals. Valuation **about $1.3 billion** per people familiar; Bansal did not confirm. IPO talk is separate (₹30 billion / ~$314 million reported). **Network Bio** — Palo Alto launch with **$50 million** (Section 32, Thiel Bio, [Founders Fund](/fund/founders-fund), Breyer Capital, Blue Venture Fund, JSL Health Capital) and a **>$30 million** co-development with an unnamed Fortune 100 / top-10 healthcare company (Business Wire via Yahoo). “World’s largest patient tissue training dataset” is **company language**. Stage label not a classic series letter. **Rundoo** — **$30 million Series B**, [Battery](/fund/battery-ventures) lead (Michael Brown joining the board), [Bessemer](/fund/bessemer-venture-partners) and [CRV](/fund/crv) returning. Total **$48 million**. **500+** independent supply stores (company). Redwood City engineering / Chicago GTM. **Relativity Networks** — **$22 million** in **SAFE** notes plus a **$40 million** follow-on order from an unnamed hyperscaler ([TechCrunch](https://techcrunch.com/2026/08/19/relativity-networks-raises-22-million-to-bring-a-faster-kind-of-fiber-to-data-centers/)). Adjacent to our [Point2 RF interconnect](/2026-point2-136m-series-b-rf-interconnect) tape — different physics (fiber vs RF). **Peeko** — **₹67.4 crore Series A**, Chiratae lead, Stellaris returning ([Hindu Business Line](https://www.thehindubusinessline.com/companies/peeko-raises-674-cr-series-a-funding-led-by-chiratae-ventures/article71365765.ece), Aug 20). Bengaluru babycare. Seed was **$3.2M** (2025, Stellaris). India retail, not a U.S. mega-round. **Groww / YC secondary** — Indian press (Inc42 via The Founder Nation) says YC sold more Groww parent shares in a bulk deal. Treat as **secondary liquidity**, not a new Groww primary round. We do not have a YC announcement. ## Do not add as August 19–20 news - **Centralize $19M** — Business Wire **July 29, 2026**. Dealroom indexed it **August 19**. Same scrape-date trap as Checkout.com rows. [NEA](/fund/new-enterprise-associates) and [YC](/fund/y-combinator) are on that round; it is **not** this week’s tape. - Stale last-rounds on aggregator sheets (Checkout.com 2022, Stability 2022, Better.com 2021). - [Temporal](/startup/temporal) **$12B** and [EliseAI](/startup/eliseai) **$3.7B** remain **talks**. ## Where to go next Diligence memos: [Castelion $13B](/2026-castelion-1b-series-c-13b-hypersonics), [ALSO $150M](/2026-also-150m-series-d-rivian-spinout). Next 48 hours: [Aug 21–25 tape](/2026-august-21-25-investment-news-orbital-ai-yc). Prior week: [Aug 14–19 tape](/2026-august-14-18-investment-news-ai-infra-physical). YC applications: [Fall 2026 guide](/yc-fall-2026-application-deadline-interview-guide). Directory: [/directory](/directory).