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Leopold Aschenbrenner: Nebius Stake, Situational Awareness Fund, and AI Safety Views · history

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2026-06-08 18:15 UTC · 143 items

What

Leopold Aschenbrenner's Situational Awareness LP holds a 5.6% stake (12.41 million shares, ~$2.86 billion) in Nebius Group [11][37], which is up 170% year-to-date in 2026 [15]. The Wall Street Journal has reported the fund's AUM at $20 billion [10] — a figure higher than both the $13.7 billion cited in earlier promotional coverage [4] and independent portfolio-tracker estimates of $5–5.5 billion from 13F filings [7][8]. Barron's and Yahoo Finance joined the growing roster of major financial outlets covering the story [26][25]. The fund's disclosed 24-stock portfolio [22] includes named infrastructure holdings in Nebius, IREN, and HIVE Digital Tech.

Why it matters

WSJ coverage moves the story into top-tier financial journalism and introduces a third competing AUM figure, making what the fund actually manages a live factual dispute rather than a promotional ambiguity. Aschenbrenner's disclosures continue to move share prices in compute infrastructure companies, so the accuracy of the fund's size affects how its market influence is assessed.

Open questions

  • WSJ now reports fund AUM at $20B [10], higher than the $13.7B promotional figure [4] and well above the $5–5.5B computed from 13F data [7][8] — does the discrepancy reflect leverage, non-U.S. assets, structures not captured by 13F filings, or an error in one of the figures?

  • The WSJ describes Aschenbrenner as having a 'growing fan club on Wall Street' [27] — will that coverage prompt Aschenbrenner or the fund to clarify its actual AUM or capital structure publicly?

  • Does Aschenbrenner's 5.6% Nebius stake [11], filed on a 13G rather than a 13F, confer any governance or influence rights, or is it a purely passive position?

  • Will Aschenbrenner's allegation that OpenAI dismissed him for raising safety concerns draw regulatory scrutiny, given CAIP and Business Insider have amplified his account? [1]

Narrative

Leopold Aschenbrenner was dismissed from OpenAI in mid-2024 under circumstances he described as retaliation for raising safety and security concerns internally [1][2][3]. He subsequently published a 165-page essay, 'Situational Awareness: The Decade Ahead,' predicting superhuman AI within the current decade [4][5], and founded Situational Awareness LP, a San Francisco-based hedge fund. The fund's AUM has been reported three ways: promotional social media and newsletters cited $13.7 billion [4][6]; independent portfolio-tracking sites compute $5–5.5 billion from the same regulatory 13F filings [7][8][9]; and the Wall Street Journal, in the most recent major coverage, put the figure at $20 billion [10]. Aschenbrenner has not publicly addressed any of the competing figures.

In late May 2026, Situational Awareness LP disclosed a 5.6% stake — 12.41 million shares — in Nebius Group, a Nasdaq-listed AI infrastructure company backed by Nvidia [11][12]. The stake, valued at roughly $2.86 billion, drove Nebius shares up more than 10% on the day of disclosure [13][14]; the stock is up 170% year-to-date in 2026 [15]. Nebius separately reported 684% revenue growth driven by data-center demand [16] and announced plans to raise AI infrastructure spending to $25 billion [17]. A 13G filing confirms the fund also holds IREN, a GPU compute company, at roughly one-third the Nebius position by value [18][19]; IREN subsequently closed a $3.65 billion investment-grade GPU financing facility [20]. HIVE Digital Tech has been identified as a position added this quarter [21], making it the third named infrastructure holding alongside Nebius and IREN in a disclosed 24-stock portfolio [22].

The disclosures generated sustained amplification across two tiers of media. Reuters, CNBC, Motley Fool, Yahoo Finance, and Globe and Mail covered the Nebius stake as a market-moving event [13][23][24][15][25]; Barron's followed [26]; and the Wall Street Journal framed the story around Aschenbrenner's 'growing fan club on Wall Street' [27][10]. In parallel, Milk Road AI ran a multi-post series blending his safety arguments with his investment track record [28][29]; U.S. Global Investors, a publicly listed investment firm, amplified his disclosures to its audience [30]; and retail trackers promoted 13F filings as actionable signals [31][32]. Jim Cramer also commented on the NBIS position [33].

Running alongside the investment story, Aschenbrenner's public argument holds that 'almost nobody is actually working on AI safety' despite industry rhetoric [29], that AI honesty is the crux of the alignment problem [34], and that OpenAI specifically failed on safety culture [1][2]. Published critics have characterized his AGI-by-2027 timeline as speculative hype with poor historical precedent [35][36]. His concentrated infrastructure investment — financially incentivizing the AI buildout — sits in unaddressed tension with his public advocacy for caution about AI risks.

Timeline

  • 2024-06-01: Aschenbrenner is dismissed from OpenAI; he claims retaliation for raising safety and security concerns internally. [1][2][3]
  • 2024-06-01: Aschenbrenner publishes 'Situational Awareness: The Decade Ahead,' a 165-page essay predicting AGI within the current decade. [4][5]
  • 2024-06-15: Published critics characterize Aschenbrenner's AGI-by-2027 prediction as speculative hype with poor historical precedent. [35][36]
  • 2024-07-01: Aschenbrenner founds Situational Awareness LP, a San Francisco-based hedge fund focused on AI. [4][6]
  • 2025-01-01: Promotional coverage reports fund assets at ~$13.7B; independent trackers compute $5–5.5B from the same 13F filings. [4][7][8]
  • 2025-06-01: Fund buys Bloom Energy stock; the position subsequently appreciates 176%. [44]
  • 2026-05-27: Disclosure of Situational Awareness LP's 5.6% stake (12.41M shares) in Nebius Group goes viral on financial social media. [4][31][47][48][49]
  • 2026-05-28: Nebius shares jump more than 10% pre-market; Reuters, CNBC, and Motley Fool publish coverage. [13][23][24][14]
  • 2026-05-28: Nebius stake valued at ~$2.86B; Nebius announces $25B in planned AI infrastructure spending; Milk Road AI begins amplification series. [37][31][17][28][29]
  • 2026-05-29: 13G filing data shows IREN as a second major fund position, at roughly one-third the Nebius value. [18][19]
  • 2026-05-31: Nebius reports 684% revenue growth; Milk Road AI cites Jensen Huang's interest in Nebius as additional validation. [16][38]
  • 2026-06-02: Jim Cramer comments on NBIS stake; IREN closes a $3.65B investment-grade GPU financing facility. [33][20][50]
  • 2026-06-03: HIVE Digital Tech identified as a new position added to the Situational Awareness LP portfolio this quarter. [21]
  • 2026-06-04: Yahoo Finance and Globe and Mail report the fund's 24-stock portfolio; Nebius noted as up 170% year-to-date. [22][45][46][15]
  • 2026-06-05: U.S. Global Investors (@USFunds), a publicly listed investment firm, amplifies Aschenbrenner to its audience. [30][40][41][42]
  • 2026-06-06: Barron's covers the Nebius surge; Yahoo Finance extends coverage of the 5.6% stake and fund thesis. [26][25][51]
  • 2026-06-08: WSJ reports Situational Awareness LP has grown to $20B in assets, describing Aschenbrenner as having a 'growing fan club on Wall Street.' [27][10]

Perspectives

Leopold Aschenbrenner

Believes AGI is likely within this decade; identifies AI honesty as the crux of alignment; alleges OpenAI failed on safety culture; operationalizes these convictions through a concentrated infrastructure investment thesis centered on Nebius, IREN, and HIVE.

Evolution: Consistent in his safety-focused framework; the expanding portfolio confirms the compute-infrastructure thesis rather than diversifying away from it.

[34][29][1][2][5][4][37][3][18][21]

Wall Street Journal and Barron's

Covering Aschenbrenner as a significant Wall Street figure with a 'growing fan club'; framing the fund's growth from a 165-page essay to a reported $20B vehicle as a notable financial story.

Evolution: New in this cycle; their entry marks the story's arrival in top-tier financial journalism, above social-media and newsletter amplification.

[27][10][26]

Milk Road AI (@MilkRoadAI)

Actively amplifying Aschenbrenner as a credible, prescient AI thinker and investor; treats safety arguments and investment returns as intertwined credibility signals.

Evolution: Six-post campaign through late May extended without framing change; tone consistently promotional.

[4][28][29][34][6][38]

U.S. Global Investors (@USFunds) and financial social media amplifiers

Treating Situational Awareness LP's portfolio disclosures as actionable investment signals; USFunds, a regulated investment firm, joined retail amplifiers in promoting Aschenbrenner's name recognition.

Evolution: USFunds gave the amplification a more institutional flavor; the pattern has since extended to further retail sharing without substantive new claims.

[31][32][39][18][30][40][41][42]

Independent portfolio trackers (stockcircle, hedgefollow, holdingschannel)

Computing Situational Awareness LP's AUM at $5–5.5B from 13F regulatory filings, significantly below both the $13.7B promotional figure and the WSJ's $20B.

Evolution: Consistent; their calculations now represent one of three competing AUM figures with no reconciliation from any party.

[7][9][8][43]

Mainstream financial media (Reuters, CNBC, Yahoo Finance, Motley Fool, Globe and Mail)

Covering the Nebius stake and fund portfolio as legitimate market-moving events; focused on price impact and the 'ex-OpenAI employee' framing with no editorial stance on safety arguments.

Evolution: Coverage broadened over two weeks to include 24-stock portfolio context and the 170% year-to-date Nebius gain.

[13][23][44][16][24][45][46][22][15][25]

AGI skeptics (ignorance.ai, davidmaiolo.com)

Characterize Aschenbrenner's AGI-by-2027 prediction as speculative hype, citing a historical pattern of overconfident AI forecasting.

Evolution: Consistent; these pieces predate the 2026 fund disclosures and represent a critical counter-narrative absent from promotional coverage.

[35][36]

Tensions

  • Three competing AUM figures exist for Situational Awareness LP: independent portfolio trackers compute $5–5.5B from 13F filings; earlier promotional coverage cited $13.7B; the WSJ now reports $20B — no party has addressed the discrepancy. [7][8][9][4][10]
  • Milk Road AI and financial amplifiers frame Aschenbrenner's AGI timeline as prescient vindication; published skeptics characterize the same forecast as speculative hype with poor historical precedent. [38][35][36]
  • Aschenbrenner's role as a large-scale investor in AI infrastructure creates a potential conflict between his safety-focused intellectual stance and his financial incentive to accelerate the AI buildout. [4][37][6][18][21]
  • Aschenbrenner claims OpenAI fired him for raising safety concerns; OpenAI has not confirmed this account, leaving the true reason for his dismissal contested. [1][2][3]
  • Aschenbrenner argues 'almost nobody is actually working on AI safety' despite industry rhetoric — directly at odds with how frontier labs publicly characterize their safety investments. [29]

Sources

  1. [1] Influential Safety Researcher Sounds Alarm on OpenAI's Failure to Take Security Seriously | Center for AI Policy | CAIP — reactive:aschenbrenner-nebius-fund
  2. [2] Fired For Raising Safety Concerns, Says Former OpenAI Researcher — reactive:aschenbrenner-nebius-fund
  3. [3] Ex-OpenAI Researcher Explains Why He Was Fired - Business Insider — reactive:aschenbrenner-agi-thesis
  4. [4] The man who turned $225 million into $13.7 billion just took a 5.6% stake in Nebius (Save this). — Milk Road AI Twitter (2026-05-27)
  5. [5] About - SITUATIONAL AWARENESS — reactive:aschenbrenner-agi-thesis
  6. [6] Nebius is one of the most undervalued AI infrastructure companies in the public markets right now (Save this). — Milk Road AI Twitter (2026-05-30)
  7. [7] $5B Situational Awareness LP Portfolio / Leopold Aschenbrenner — reactive:aschenbrenner-nebius-fund
  8. [8] Leopold Aschenbrenner's $5.5B Situational Awareness Fund — reactive:aschenbrenner-agi-thesis
  9. [9] Situational Awareness Portfolio | Leopold Aschenbrenner 13F Holdings & Trades — reactive:aschenbrenner-agi-thesis
  10. [10] 24-year-old Leopold Aschenbrenner turned an AI thesis into a $20B hedge fund, WSJ reports. Situational Awareness scaled ... — reactive:aschenbrenner-nebius-fund (2026-06-08)
  11. [11] Leopold Aschenbrenner owns 12.41M shares of $NBIS - Reddit — reactive:aschenbrenner-nebius-fund
  12. [12] Leopold Aschenbrenner Situational Awareness Fund Just Bought This Nvidia - Backed Neocloud Stock — reactive:aschenbrenner-nebius-fund (2026-05-29)
  13. [13] Nebius shares jump more than 10% as former OpenAI employee's fund buys stake - Reuters — reactive:aschenbrenner-nebius-fund
  14. [14] NEBIUS +11% PRE-MARKET AFTER EX-OPENAI RESEARCHER'S FUND DISCLOSES STAKE — reactive:aschenbrenner-nebius-fund (2026-05-28)
  15. [15] Nebius Stock Is Up 170% in 2026, and Leopold Aschenbrenner Just ... — reactive:aschenbrenner-nebius-fund
  16. [16] Nebius stock soars as revenue jumps 684% on booming data center demand — reactive:aschenbrenner-nebius-fund
  17. [17] Nebius raises AI infrastructure spending to $25B, secures $2.6B ... — reactive:aschenbrenner-nebius-fund
  18. [18] @MB_Hogan Leopold Aschenbrenner now holds 3.7 times more Nebius than IREN by value, and that ratio is the part of a 13G ... — reactive:aschenbrenner-nebius-fund (2026-05-29)
  19. [19] Leopold Aschenbrenner now holds 3.7 times more Nebius than IREN by value, and that ratio is the part of a 13G filing tha... — reactive:aschenbrenner-nebius-fund (2026-05-29)
  20. [20] $IREN news ‼️ ALERT IREN has closed a $3.65bn investment-grade GPU financing facility — reactive:aschenbrenner-nebius-fund (2026-06-02)
  21. [21] JUST IN: @HIVEDigitalTech shares: Leopold Aschenbrenner just increased his $HIVE as 🆕 emerging position in this quarter. — reactive:aschenbrenner-nebius-fund (2026-06-03)
  22. [22] Artificial Intelligence (AI) Prodigy Leopold Aschenbrenner's Situational Awareness Fund Owns Only 24 Stocks. These Are the Top 7 Holdings. — reactive:aschenbrenner-agi-thesis
  23. [23] This AI stock is surging after an ex-OpenAI employee's fund disclosed a stake. Here's why - CNBC — reactive:aschenbrenner-nebius-fund
  24. [24] Leopold Aschenbrenner's Situational Awareness Fund Just Bought This Nvidia-Backed Neocloud Stock — reactive:aschenbrenner-nebius-fund
  25. [25] Nebius Stock Is Up 170% in 2026, and Leopold Aschenbrenner Just Bought a 5.6% Stake. Here's Why — reactive:aschenbrenner-nebius-fund
  26. [26] Nebius Stock Surges on Backing From This Big AI Investor - Barron's — reactive:aschenbrenner-nebius-fund
  27. [27] Leopold Aschenbrenner has a growing fan club on Wall Street to go with his cult following on the internet. — reactive:aschenbrenner-nebius-fund (2026-06-08)
  28. [28] The man who turned $225 million into $13.7 billion told you something most people still haven’t absorbed (Save this). — Milk Road AI Twitter (2026-05-28)
  29. [29] The man who turned $225 million into $13.7 billion said something two years ago that the entire AI industry is still cat… — Milk Road AI Twitter (2026-05-28)
  30. [30] If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-05)
  31. [31] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-05-27)
  32. [32] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-06-01)
  33. [33] Jim Cramer on Leopold Aschenbrenner's $NBIS stake “When this ... — reactive:aschenbrenner-nebius-fund
  34. [34] The man who turned $225 million into $13.7 billion identified the single hardest unsolved problem in AI (Save this). — Milk Road AI Twitter (2026-05-29)
  35. [35] Why I'm Skeptical of AGI Timelines (And You Should Be Too) — reactive:aschenbrenner-nebius-fund
  36. [36] Debunking the Hype: Artificial General Intelligence by 2027? — reactive:aschenbrenner-nebius-fund
  37. [37] Leopold Aschenbrenner — the ex-OpenAI researcher who predicted superhuman AI by 2027 — just disclosed a $2.86B stake in ... — reactive:aschenbrenner-nebius-fund (2026-05-28)
  38. [38] Nebius is one of the most undervalued AI infrastructure companies in the public markets right now (Save this). — Milk Road AI Twitter (2026-05-31)
  39. [39] Leopold Aschenbrenner (b. 2002, Germany) is the founder and chief investment officer of Situational Awareness LP, an AI‑... — reactive:aschenbrenner-nebius-fund (2026-06-04)
  40. [40] RT @USFunds: If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-06)
  41. [41] RT @USFunds: If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-06)
  42. [42] RT @USFunds: If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-05)
  43. [43] Situational Awareness LP AUM History: 13F Portfolio Value Over Time — reactive:aschenbrenner-nebius-fund
  44. [44] Leopold Aschenbrenner's Situational Awareness Fund Bought Bloom Energy Stock Before a 176% Run. Here Is the Artificial Intelligence (AI) Stock He Owns That I Think Will Go Parabolic Next. — reactive:aschenbrenner-nebius-fund
  45. [45] Beyond Hyperscalers: Why Leopold Aschenbrenner Just Bought 5.6% of Nebius — reactive:aschenbrenner-nebius-fund
  46. [46] Fund Update: Leopold Aschenbrenner's Situational Awareness LP ... — reactive:aschenbrenner-nebius-fund
  47. [47] Leopold Aschenbrenner's Situational Awareness LP disclosed a 5.6 ... — reactive:aschenbrenner-nebius-fund
  48. [48] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-05-27)
  49. [49] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-05-27)
  50. [50] $IREN news ‼️ ALERT IREN has closed a $3.65bn investment-grade GPU financing facility — reactive:aschenbrenner-nebius-fund (2026-06-02)
  51. [51] Nebius Stock Is Up 170% in 2026, and Leopold Aschenbrenner Just Bought a 5.6% Stake. Here's Why #stocks — reactive:aschenbrenner-nebius-fund (2026-06-06)