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Top 20 Private Companies in 2026, The Billionaire Tax, Mistral AI Valuation | Augment + Sacra | Ep20

January 21, 2026

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  • A proposed California billionaire wealth tax faces significant legal challenges regarding its structure (one-time nature, taxing control vs. economic value) and is already causing high-net-worth individuals like Larry Page and Sergey Brin to consider leaving the state. 
  • The private secondary market is expected to continue growing as a vital third leg of liquidity alongside IPOs and M&A, driven by a higher bar for public listings (requiring $400M-$500M in revenue) that forces many large companies to stay private longer. 
  • Recent private funding rounds for major AI companies like Anthropic ($350B valuation) and Cerebras ($22B valuation) demonstrate that private markets are currently offering higher valuations and more favorable terms than public markets were recently willing to accept. 
  • Mistral AI's premium valuation (reportedly 100x revenue) is questioned because the company appears to be losing B2B enterprise market share to competitors like Anthropic and its recent lead investors are strategic (NVIDIA, ASML) rather than experienced financial investors. 
  • Augment Markets pivoted its business model to use Special Purpose Vehicles (SPVs) to streamline secondary market execution, reducing the typical 30-60 day closing time to as little as five minutes by managing cap table swaps off-balance sheet. 
  • The secondary private market is seeing increased trading activity, with 20-25% of shares acquired via Augment's SPVs trading within six months to a year, driven by institutional needs to return capital and individual investors realizing gains for personal liquidity events. 

Segments

California Billionaire Tax Proposal
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(00:01:15)
  • Key Takeaway: The proposed California wealth tax targets billionaires with a one-time 5% excise tax, but faces legal challenges over its structure and penalizes founders based on voting control rather than economic value.
  • Summary: The proposal, sponsored by the Healthcare Workers Union, has not yet made the ballot and faces constitutional questions regarding its consistency with Prop 13. Key drafting issues include the lack of mechanism to enforce its one-time nature and a provision taxing based on 50% voting stock ownership even if economic value is only 5%. Billionaires like Larry Page and Sergey Brin are reportedly re-domiciling assets to avoid the potential tax.
2026 IPO Outlook and Tax Revenue
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(00:07:05)
  • Key Takeaway: California’s budget revenue is expected to benefit significantly from potential mega-IPOs in 2026 from companies like OpenAI, Anthropic, and SpaceX, potentially yielding a near-record year for capital gains tax revenue.
  • Summary: Revenue has recently increased, partly due to AI activity and secondary sales. If SpaceX, OpenAI, and Anthropic go public, they could generate $75 billion in IPO proceeds alone, which would be a near-record year for the US market. Kicking out billionaires via the wealth tax could jeopardize ongoing income tax revenue, making the IPO windfall crucial for the state budget.
China IPO Market Recovery
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(00:09:11)
  • Key Takeaway: China’s IPO market saw a 2x increase in activity in 2025 compared to 2024, driven by regulatory relaxations favoring unprofitable companies and strategic sectors like AI and new energy.
  • Summary: China had 115 companies raise $18 billion in 2025, doubling the previous year’s volume, although the Shanghai Composite Index has lagged the US market over the last decade. Rule changes now allow unprofitable companies to list on the Shanghai STAR market and have relaxed the 23x P/E valuation cap. This push may signal China’s intent to decouple from US capital markets.
Secondary Markets Growth and IPO Bar
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(00:13:10)
  • Key Takeaway: The secondary market is expanding because the bar for traditional US IPOs is significantly higher, forcing many high-quality, large private companies to seek liquidity elsewhere.
  • Summary: Companies aiming for a US IPO now likely need $400M to $500M in revenue, facing considerable regulatory scrutiny. JP Morgan is forming a dedicated team to capitalize on this private market boom, viewing secondaries as a viable path to liquidity for companies not yet ready for the top tier. This trend suggests secondary markets will remain robust alongside IPO and M&A activity.
Recent Private Market Funding Highlights
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(00:17:47)
  • Key Takeaway: Major AI and infrastructure companies secured substantial private funding at high valuations, including Cerebras at $22B and 11 Labs at an $11B valuation, highlighting massive private capital appetite.
  • Summary: Cerebras raised $1B at a $22B valuation despite previously pulling an IPO due to concerns over 87% customer concentration with G42. Replit’s valuation tripled in months, jumping from $3B to $9B. Sequoia’s participation in Anthropic’s $350B valuation round is viewed as a positive signal because Sequoia is a financially sophisticated investor, not just a strategic partner.
Augment Power 20 Methodology
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(00:24:18)
  • Key Takeaway: The Augment Power 20 ranking reflects the top 20 private companies based on market activity signals like transaction volume, bid-ask spread, and price change, heavily favoring AI names.
  • Summary: The methodology combines Augment’s market data with Sacra’s company fundamentals, focusing on revenue and growth estimates. Transaction volume is highly concentrated, with the top 5-10 companies representing about half of all activity. SpaceX, Anthropic, and OpenAI consistently lead the rankings, reflecting intense institutional demand.
AI Valuation Multiples and Risks
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(00:29:32)
  • Key Takeaway: While AI valuations are high, the velocity of revenue growth for leaders like Anthropic (projected $25B ARR in 2026) may justify current multiples, though sectors like robotics show potentially overvalued multiples relative to revenue.
  • Summary: The current macro environment, with expectations of lower interest rates, is conducive to speculation cycles in risk assets. Defense is noted as a structural market with high spending, but some valuations might be stretched. Companies like XAI show massive growth rates, though these are often inflated by recent acquisitions.
Staying Private vs. Going Public
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(00:39:47)
  • Key Takeaway: Companies are incentivized to stay private longer because private markets now solve for capital and liquidity, leaving branding as the primary remaining driver for an IPO.
  • Summary: The ability to raise large capital sums privately reduces the need for public offerings. The secondary market is evolving to provide necessary liquidity, potentially leading to companies running ’test drive’ IPOs privately for price discovery. Companies are increasingly leaking top-line revenue numbers but keeping profitability details private.
French Unicorn Mistral AI Valuation
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(00:56:22)
  • Key Takeaway: Mistral AI achieved a $13B valuation on $100M in contractual ARR, resulting in a 100x multiple that significantly exceeds the 25x-30x multiples seen for US leaders like OpenAI and Anthropic.
  • Summary: Mistral is a top French unicorn, but its market share in B2B enterprise LLMs appears to be shrinking relative to Anthropic, which is gaining share. The high multiple is not justified by strategic investors leading the recent round (NVIDIA, ASML) over experienced financial VCs. The nature of LLM contracts means their ARR is less robust than traditional SaaS recurring revenue.
Mistral AI Valuation Critique
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(00:59:52)
  • Key Takeaway: Mistral AI commands a valuation premium over OpenAI and Anthropic despite appearing to lose B2B market share.
  • Summary: Mistral AI’s valuation multiple exceeds that of OpenAI or Anthropic, which are valued at 25 to 30 times ARR. Analysis suggests Mistral is losing market share to Anthropic in the B2B enterprise LLM space. Furthermore, strategic investors like NVIDIA and ASML leading rounds are viewed less favorably than dedicated financial investors.
Augment’s Secondary Market Model
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(01:04:23)
  • Key Takeaway: Augment pivoted to an SPV-centric model to solve slow execution and cap table complexity in secondary trades.
  • Summary: Augment secured broker-dealer and ATS licenses to address the 30-60 day execution time and legal documentation overhead in secondary transactions. Their solution involves purchasing securities off-balance sheet, placing them into an SPV, and having investors buy units of the SPV instead of direct shares. This structure allows for trades to be executed in as little as five minutes if shares are already held.
Liquidity Drivers in Private Markets
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(01:09:00)
  • Key Takeaway: Trading activity within private shares is high, driven by institutional LP capital return needs and individual investors realizing gains.
  • Summary: Institutional investors often sell shares to return capital to their LPs or reinvest in earlier-stage opportunities. Individual investors sell when they hit a satisfactory return multiple (e.g., 5X) to fund major life purchases like a down payment on a house. Currently, 20-25% of shares traded through Augment’s SPVs have already been resold within six to twelve months of acquisition.
SPV Structure and Pricing Strategy
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(01:10:06)
  • Key Takeaway: Augment prioritizes direct deals or single-layer SPVs, aiming to buy at or below market value by leveraging high-volume buying power.
  • Summary: Augment prefers to facilitate trades anchored by institutional investors setting the price, rather than acting as an asset manager setting the price themselves. They maintain a preference stack: direct-to-company deals are best, followed by one-layer SPVs, avoiding nested SPV structures due to fee layering concerns. Their growing transaction volume allows them to act as a reliable, large buyer, securing better pricing.
Future of Private Market Infrastructure
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(01:15:47)
  • Key Takeaway: The private market infrastructure is moving toward consolidation around central exchanges or shared technology layers, similar to public markets.
  • Summary: The speaker worries that recent acquisitions might lead to fragmentation, reversing progress made by price aggregators pre-2020. The future may involve one or two central exchanges (like NASDAQ) providing the financial rails, with retail brokerages plugging in via different interfaces. Augment aims to be the ‘Robinhood for private markets’ by focusing on superior user experience and distribution through RIAs and wealth managers.
Liquidity Necessity for Private Companies
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(01:21:34)
  • Key Takeaway: Companies staying private longer necessitates offering employee liquidity, as employees need access to capital for life events.
  • Summary: The high interest in private companies, coupled with longer private company lifecycles, means employees holding concentrated wealth need liquidity options. Regular liquidity, perhaps via tender offers every 6-12 months, is becoming a competitive advantage for employee retention. Augment is investing in technology to enable instantaneous secondary trades and plans to leverage its SPV volume to push for better distribution channels.