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Enhanced Anthropic stakeholders table with HoverCards, entity previews, full-bleed layout6 weeks ago

Multi-round enhancement of the Anthropic stakeholders page. Session 1: added 5 canonical facts, refactored table into server+client split, column toggles, pledge ranges. Session 2: replaced FactRef hash badges with Radix HoverCard popovers on values (interactive, stays open); added EntityPreviewLink hover cards on stakeholder names; added live valuation input so users can recalculate at custom valuations; added `contentFormat: table` + `hideSidebar: true` to hide left sidebar and give table full container width; added `prose-constrain-text` CSS to keep text at 65rem while table component uses full 90rem container; fixed EA connections (Chris Olah and Jack Clark upgraded to "Moderate"; Tom/Jared/Sam updated to "Weak/unknown" with reasoning); added Methodology & Assumptions section explaining how all estimates were derived.

sonnet-4-6 · ~2h (two sessions)

PR polish + frontmatter update#2956 weeks ago

Updated PR #295 description to check off the already-satisfied CI lint item and annotate remaining test plan items as human-action-required. Updated `anthropic-stakeholders.mdx` frontmatter: raised `readerImportance` and `researchImportance` to 85, set `update_frequency` to 14 days. Ran full gate check (7/7 passed). Marked issue #294 done.

sonnet-4 · ~15min

Create dedicated Anthropic stakeholder page6 weeks ago

Created a new dedicated `anthropic-stakeholders` page with the most shareable ownership tables (all stakeholders with stakes, values, EA alignment), added a condensed stakeholder summary to the top of the main Anthropic page, and wrote 4 proposed GitHub issues for broader system changes (datasets infrastructure, importance metrics rethink, concrete data expansion, continuous maintenance).

opus-4-6 · ~30min

Enhance fact system on Anthropic stakeholders page6 weeks ago

Added 8 new canonical facts to `data/facts/anthropic.yaml` (Google stake %, Google/Amazon investments, founder equity totals, EA-aligned capital range), a new `equity-stake-percent` measure, and built a programmatic `AnthropicStakeholdersTable` React component with derived "Exp. Donated" and "Exp. EA-Effective" columns that auto-scale with the current valuation fact. Updated the MDX page to use `<F>` components for volatile inline figures.

sonnet-4 · ~30min

Issues2
QualityRated 60 but structure suggests 87 (underrated by 27 points)
Links7 links could use <R> components

Anthropic Stakeholders

Data as of March 2026

All values at 380000000000 post-money valuation (Anthropic Series G, Feb 2026). Secondary/derivatives markets imply ≈$595B (Ventuals, Mar 2026) — at that pricing, all dollar values below would scale by approximately 1.57x. A $5-6B employee tender offer launched Feb 2026 at $350B pre-money. For detailed analysis of EA-aligned capital flows, see Anthropic (Funder). For valuation scenarios and secondary market breakdown, see Anthropic Valuation Analysis.

Stakeholder Ownership & Philanthropy

The table below shows each stakeholder's estimated equity stake, the fraction pledged to charitable giving ("Pledge %"), the estimated probability those donations go to EA-aligned causes ("EA Align %"), and two derived columns: expected donated dollars and expected EA-effective giving. All values scale automatically with the current valuation.

Anthropic stakeholder data is temporarily unavailable (valuation fact not found in FactBase).

Total funding raised: 10750000000 across 17 rounds. Current valuation: 380000000000 (as of Feb 2026) (Series G).

Founder Donation Pledges

All seven co-founders have pledged to donate 80% of their equity. Fortune At current valuations, that's $43–64B if fully honored — derived from $53–80B in combined founder equity.

FounderEA ConnectionPledge Fulfillment Likelihood
Dario AmodeiStrong — GWWC signatory, early GiveWell supporter, former roommate of Holden KarnofskyHigh
Daniela AmodeiStrong — married to Holden Karnofsky (GiveWell co-founder, now at Anthropic)High
Chris OlahModerate — interpretability pioneer; has participated in EA events; work closely aligned with EA safety prioritiesMedium
Jack ClarkModerate — responsible AI advocate; founded Import AI newsletter; EA-adjacent framing in policy workMedium
Tom BrownWeak/unknown — GPT-3 lead author; chose Anthropic's safety mission; no documented EA pledgeLow-Medium
Jared KaplanWeak/unknown — scaling laws pioneer; safety-motivated co-founder; no documented EA pledgeLow-Medium
Sam McCandlishWeak/unknown — alignment researcher; no publicly documented EA connectionsLow-Medium

Only 2 of 7 founders have documented strong EA connections. The remaining 5 all chose to leave OpenAI specifically to found a safety-focused lab, suggesting at minimum EA-adjacent motivations — but no documented pledges or EA Forum activity for Brown, Kaplan, and McCandlish. Founder pledges are not legally binding — enforcement relies on reputational cost. Historical Giving Pledge data shows only 36% of deceased pledgers met their commitment. IPS

EA-Aligned Capital Summary

SourceGross ValueRisk-Adjusted ValueReliability
Strongly EA-aligned founders (Dario, Daniela)$11-17B$6-12BPledge-dependent
Safety-focused founders (Olah, Clark)$11-17B$3-8BUncertain cause direction
Non-EA founders (Brown, Kaplan, McCandlish)$17-25B$2-7BUnlikely EA
Jaan Tallinn$2-6B$1.4-5.4BVery high (>90%)
Dustin Moskovitz$3-9B$2.7-9BCertain (already committed)
Employee pledges + matching$20-40B$16-38BLegally bound (in DAFs)
Non-pledged EA employees≈$2B$0.4-0.8BModerate
Total$66-116B$27-76B

Employee capital in donor-advised funds ($27–76B risk-adjusted) is the most reliable source — legally bound, though donors retain discretion over which charities receive grants. The historical 3:1 matching program (employees pledge up to 50%, Anthropic matches 3x) has been reduced to 1:1 at 25% for employees hired after 2024. EA Forum Anthropic Careers

Funding Timeline

Funding History
8 entries
DateRaisedValuationLead InvestorNotes
2024-02$750 million$18.4 billionMenlo VenturesSeries D led by Menlo Ventures via an SPV structure. Pre-money valuation of ~$15B, post-money approximately $18.4B. Menlo had first invested in Anthropic in the Series C.
2023-05$450 millionSpark CapitalSeries C led by Spark Capital. Other participants included Google, Menlo Ventures, Salesforce Ventures, Microsoft, and others. Google separately agreed to invest up to $2B in 2023 to acquire ~10% stake.
2025-03-03$3.5 billion$61.5 billionLightspeed Venture PartnersSeries E led by Lightspeed Venture Partners ($1B contributed). Participants included Bessemer Venture Partners, Cisco Investments, D1 Capital Partners, Fidelity Management & Research, General Catalyst, Jane Street, Menlo Ventures, and Salesforce Ventures. Post-money valuation of $61.5B.
2022-04$580 million$4 billionFTX / Sam Bankman-FriedSeries B led by Sam Bankman-Fried and Caroline Ellison of FTX. Post-money valuation of $4B. FTX subsequently collapsed in 2022.
2025-09-02$13 billion$183 billionICONIQSeries F led by ICONIQ, co-led by Fidelity Management & Research and Lightspeed Venture Partners. Significant investors include Altimeter, Baillie Gifford, BlackRock, Blackstone, Coatue, GIC, Goldman Sachs Alternatives, General Catalyst, Insight Partners, Jane Street, Ontario Teachers' Pension Plan, Qatar Investment Authority, TPG, T. Rowe Price, and XN. Post-money valuation of $183B.
2021-05$124 million$550 millionDustin Moscovitz / Jaan TallinnDustin Moscovitz (Facebook co-founder) and Jaan Tallinn (Skype co-founder) were among seed investors and led the Series A. Pre-money valuation of $550M.
2023-09$4 billion$18.1 billionAmazonAmazon committed up to $4B paid in two tranches (first in Sept 2023, second in Nov 2024). Brought total Amazon investment to $8B. Included AWS as primary cloud and training partner. Valuation reached $18.1B by early 2024.
2026-02-12$30 billion$380 billionGIC / CoatueSeries G led by GIC and Coatue, co-led by D.E. Shaw Ventures, Dragoneer, Founders Fund, ICONIQ, and MGX. Round includes a portion of previously announced investments from Microsoft and NVIDIA. Significant investors include Accel, Sequoia Capital, Bessemer, General Catalyst, Goldman Sachs, JPMorganChase, Lightspeed, Menlo, Morgan Stanley, Temasek, TPG, and others. Post-money valuation of $380B — second-largest private venture funding deal of all time.

Total raised: 10750000000 across 17 rounds. Anthropic

Google has invested $3.3B across 3 rounds for approximately ~14% of equity. Amazon has invested $10.75B and serves as Anthropic's primary cloud partner; its exact stake is undisclosed.

Capital Deployment Timeline

SourceEarliestPeak FlowStatus
Employee DAFs2025-20262027-2030Already transferring
Moskovitz2026-20272027-2030$500M in nonprofit vehicle
Tallinn2027-20282028-2032Likely post-IPO
Founders2028-20302030-2040Depends on IPO + pledge timing

IPO expected 2026-2027 (Kalshi: 72% chance Anthropic IPOs before OpenAI). Lock-up periods typically delay capital 6-12 months post-IPO. See Anthropic IPO.

Methodology & Assumptions

All figures in this table are estimates with significant uncertainty. Key assumptions:

Equity stakes:

  • Founders (2–3% each): Estimated from reported total founder equity (~14–21% for 7 co-founders). No individual founder stakes have been publicly disclosed; range reflects typical dilution across 7 people with differential contributions.
  • Google (~14%): Derived from Google's $3.3B total investment and Anthropic's $18B Series D valuation; cross-checked against Bloomberg reporting.
  • Tallinn (0.6–1.7%), Moskovitz (0.8–2.5%): Estimated from Series A lead position and subsequent dilution; no public disclosures.
  • Employee pool (12–18%): Typical early-stage AI lab employee equity range; diluted from founding allocations through Series G.

Pledge rates:

  • Founders (80%): Documented in Fortune reporting on the public pledge announcement.
  • Employee pool (25–50%): Lower bound from current 1:1 matching at 25% for post-2024 hires; upper bound from historical 3:1 matching program at 50% for pre-2025 hires. See EA Forum.
  • Tallinn (90%), Moskovitz (95%): Based on documented giving track records and explicit commitments.

EA alignment estimates (most uncertain column):

  • Based on: public statements, organizational affiliations, EA Forum activity, documented giving patterns, and whether donations have gone to EA-identified causes.
  • Dario/Daniela: GWWC signatories with documented EA community ties → 80–90%.
  • Chris Olah: Interpretability work is core EA-aligned; EA event participation → 40–60%.
  • Jack Clark: EA-adjacent responsible AI framing, less documented EA cause alignment → 30–50%.
  • Brown/Kaplan/McCandlish: Safety motivation for founding Anthropic but no documented EA cause preferences → 15–30%.
  • Employee pool: Blended estimate across a population with high EA representation at senior levels → 40–70%.

These are Fermi estimates for planning purposes, not verified figures. The "EA-Effective" column represents expected value and should be treated with wide error bars.

  • Anthropic (Funder) — Full analysis of EA-aligned capital, Squiggle models, and scenario analysis
  • Anthropic — Company overview, products, safety research
  • Anthropic Valuation Analysis — Valuation scenarios and competitive positioning
  • Anthropic IPO — IPO timeline and liquidity analysis
  • Pre-IPO DAF Transfers — Tax optimization and DAF mechanics
  • Founder Pledge Interventions — Interventions to increase pledge fulfillment

References

This Fortune article reported on Google's approximately 10% investment stake in Anthropic, reflecting the trend of major tech companies making significant investments in leading AI safety-focused labs. The page is no longer accessible, returning a 404 error.

★★★☆☆

Anthropic secured a $4 billion investment from Amazon, expanding their cloud partnership and making Amazon Web Services the primary cloud provider for Anthropic's AI workloads. This deal significantly increases Anthropic's total funding and deepens the company's ties to Amazon's infrastructure, reinforcing the role of major cloud providers in shaping the competitive AI landscape.

★★★★☆

Anthropic's co-founders, including CEO Dario Amodei, have committed to donating 80% of their wealth to philanthropic causes, with a focus on addressing inequality and navigating the societal impacts of the AI revolution. The pledge reflects the effective altruism-influenced values that have shaped Anthropic's culture and mission. This signals how leading AI lab founders are thinking about their responsibilities given potential large-scale wealth creation from AI.

★★★☆☆

A critical analysis from the Institute for Policy Studies evaluating the Giving Pledge's 15-year track record, finding that most original signatories have grown wealthier rather than giving away their fortunes, with contributions largely warehoused in private foundations and donor-advised funds. The report argues the Pledge is structurally unfulfillable and insufficient as a mechanism for wealth redistribution or addressing societal challenges.

5Anthropic CareersAnthropic

Anthropic's careers page outlines the company's mission to build safe and beneficial AI, highlighting their guiding principles and inviting researchers, engineers, and builders to join their work on Claude and AI safety. The page emphasizes a 'race to the top' on safety culture and a commitment to ensuring powerful AI benefits humanity.

★★★★☆

Anthropic announced a major Series G funding round, reflecting significant investor confidence in safety-focused AI development. The round highlights the growing capital flowing into frontier AI labs and the commercial viability of safety-oriented AI research organizations.

★★★★☆