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

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2026-06-09 18:43 UTC · 159 items

What

Situational Awareness LP, the AI-focused hedge fund founded by former OpenAI researcher Leopold Aschenbrenner, holds a 5.6% stake (~$2.86 billion) in Nebius Group [6][8], a Nasdaq-listed AI infrastructure company up 170% year-to-date in 2026 [11]. A Wall Street Journal profile revealed Jane Street as an investor in the fund [21] and circulated performance figures of 270% year-to-date through May and 1,000% since inception [20], while reporting AUM at $20 billion [19] — a figure that conflicts with $13.7 billion in earlier promotional coverage [4] and $5–5.5 billion computed from 13F filings [23][24]. The fund also holds positions in IREN and HIVE Digital Tech within a disclosed 24-stock portfolio [14][16][17].

Why it matters

Jane Street's involvement as a named investor gives institutional weight to a fund that had been amplified primarily through social media and newsletters. Three competing AUM figures remain unreconciled, making the fund's actual scale an open factual question even as its disclosed positions move share prices in compute infrastructure companies.

Open questions

  • WSJ reports AUM at $20B [19], promotional coverage cited $13.7B [4], and independent tracker estimates from 13F data show $5–5.5B [23][24] — which figure is correct, and does the gap reflect leverage, non-U.S. assets, or a reporting error?

  • Jane Street is confirmed as a fund investor [21] — are there other named institutional backers, and does their involvement affect how the fund's disclosed infrastructure theses travel through capital markets?

  • The 270% return through May and 1,000% since inception are circulating as fact [20] — have these figures been verified by any audited disclosure, or are they drawn solely from WSJ's reporting?

  • Aschenbrenner claims OpenAI dismissed him for raising safety concerns [1][2] — will that account draw regulatory scrutiny given the fund's growing institutional profile?

Narrative

Leopold Aschenbrenner was dismissed from OpenAI in mid-2024 under circumstances he described as retaliation for raising internal safety and security concerns [1][2][3]. He subsequently published 'Situational Awareness: The Decade Ahead,' a 165-page essay predicting superhuman AI within this decade [4][5], and founded Situational Awareness LP, a San Francisco-based hedge fund focused on AI infrastructure.

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 [6][7]. Valued at roughly $2.86 billion [8], the disclosure drove Nebius shares up more than 10% [9][10]; the stock is up 170% year-to-date in 2026 [11]. Nebius separately reported 684% revenue growth driven by data-center demand [12] and announced $25 billion in planned AI infrastructure spending [13]. The fund's disclosed 24-stock portfolio also includes IREN, a GPU compute company at roughly one-third the Nebius value [14][15], and HIVE Digital Tech, a position added in the most recent quarter [16][17].

A Wall Street Journal profile published in June 2026 described Aschenbrenner as having a 'growing fan club on Wall Street' [18], reported fund AUM at $20 billion [19], and disclosed performance figures of 270% year-to-date through May and 1,000% since inception [20]. The profile also named Jane Street as a fund investor [21]. These figures conflict with earlier data: promotional newsletters cited $13.7 billion in AUM [4][22], while independent portfolio trackers computing from 13F regulatory filings put the figure at $5–5.5 billion [23][24][25]. No party has addressed the discrepancy publicly. Barron's, Yahoo Finance, Reuters, CNBC, Globe and Mail, and Motley Fool have all covered the story, and Jim Cramer commented on the Nebius position [26], giving the fund sustained attention across two tiers of financial media.

Aschenbrenner argues publicly that 'almost nobody is actually working on AI safety' despite industry rhetoric [27], that AI honesty is the crux of the alignment problem [28], 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 [29][30]. His concentrated infrastructure investment — financially tied to the pace of 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. [29][30]
  • 2024-07-01: Aschenbrenner founds Situational Awareness LP, a San Francisco-based hedge fund focused on AI. [4][22]
  • 2025-01-01: Promotional coverage reports fund AUM at ~$13.7B; independent trackers compute $5–5.5B from the same 13F filings. [4][23][24]
  • 2025-06-01: Fund buys Bloom Energy stock; the position subsequently appreciates 176%. [38]
  • 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][46][53][54][55]
  • 2026-05-28: Nebius shares jump more than 10% pre-market; Reuters, CNBC, and Motley Fool publish coverage; stake valued at ~$2.86B. [9][37][39][10][8]
  • 2026-05-28: Nebius announces $25B in planned AI infrastructure spending; Milk Road AI begins multi-post amplification series. [13][32][27]
  • 2026-05-29: 13G filing data confirms IREN as a second major fund position, at roughly one-third the Nebius value. [14][15]
  • 2026-05-31: Nebius reports 684% revenue growth; Milk Road AI cites Jensen Huang's interest in Nebius as additional validation. [12][33]
  • 2026-06-02: Jim Cramer comments on NBIS stake; IREN closes a $3.65B investment-grade GPU financing facility. [26][56][57]
  • 2026-06-03: HIVE Digital Tech identified as a new position added to the Situational Awareness LP portfolio this quarter. [16]
  • 2026-06-04: Yahoo Finance and Globe and Mail report the fund's 24-stock portfolio; Nebius noted as up 170% year-to-date. [17][40][41][11]
  • 2026-06-05: U.S. Global Investors (@USFunds), a publicly listed investment firm, amplifies Aschenbrenner disclosures to its audience. [49][50][51][52]
  • 2026-06-06: Barron's covers the Nebius surge; Yahoo Finance extends coverage of the 5.6% stake and fund thesis. [31][42][58]
  • 2026-06-08: WSJ reports fund AUM at $20B, names Jane Street as an investor, and publishes performance figures of 270% YTD through May and 1,000% since inception. [18][19][21][20]

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 throughout; the expanding portfolio confirms the compute-infrastructure thesis rather than diversifying away from it.

[28][27][1][2][5][4][8][3][14][16]

Wall Street Journal and Barron's

Cover Aschenbrenner as a significant Wall Street figure with a 'growing fan club'; the WSJ profile named Jane Street as a fund investor and published AUM and performance figures not previously in public record.

Evolution: Entered the story in June 2026 as the first top-tier financial journalism outlet; the WSJ profile added new substantive disclosures rather than simply amplifying existing ones.

[18][19][31][21][20]

Milk Road AI and financial social media amplifiers

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

Evolution: Consistent promotional tone across June 2026; social media amplification of the WSJ profile has extended the campaign without adding substantive new claims.

[4][32][27][28][22][33][34][20][35]

Independent portfolio trackers (stockcircle, hedgefollow, holdingschannel)

Compute 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.

[23][25][24][36]

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

Cover 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 the 24-stock portfolio, 170% YTD Nebius gain, and WSJ-sourced performance figures.

[9][37][38][12][39][40][41][17][11][42][43][44][45]

U.S. Global Investors (@USFunds) and institutional amplifiers

Treat 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 sharing without new substantive claims.

[46][47][48][14][49][50][51][52]

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.

[29][30]

Tensions

  • Three competing AUM figures exist for Situational Awareness LP: independent trackers compute $5–5.5B from 13F filings; earlier promotional coverage cited $13.7B; the WSJ reports $20B — no party has addressed the discrepancy. [23][24][25][4][19]
  • 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. [33][29][30]
  • 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][8][22][14][16]
  • 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. [27]

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] Leopold Aschenbrenner owns 12.41M shares of $NBIS - Reddit — reactive:aschenbrenner-nebius-fund
  7. [7] Leopold Aschenbrenner Situational Awareness Fund Just Bought This Nvidia - Backed Neocloud Stock — reactive:aschenbrenner-nebius-fund (2026-05-29)
  8. [8] 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)
  9. [9] Nebius shares jump more than 10% as former OpenAI employee's fund buys stake - Reuters — reactive:aschenbrenner-nebius-fund
  10. [10] NEBIUS +11% PRE-MARKET AFTER EX-OPENAI RESEARCHER'S FUND DISCLOSES STAKE — reactive:aschenbrenner-nebius-fund (2026-05-28)
  11. [11] Nebius Stock Is Up 170% in 2026, and Leopold Aschenbrenner Just ... — reactive:aschenbrenner-nebius-fund
  12. [12] Nebius stock soars as revenue jumps 684% on booming data center demand — reactive:aschenbrenner-nebius-fund
  13. [13] Nebius raises AI infrastructure spending to $25B, secures $2.6B ... — reactive:aschenbrenner-nebius-fund
  14. [14] @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)
  15. [15] 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)
  16. [16] JUST IN: @HIVEDigitalTech shares: Leopold Aschenbrenner just increased his $HIVE as 🆕 emerging position in this quarter. — reactive:aschenbrenner-nebius-fund (2026-06-03)
  17. [17] Artificial Intelligence (AI) Prodigy Leopold Aschenbrenner's Situational Awareness Fund Owns Only 24 Stocks. These Are the Top 7 Holdings. — reactive:aschenbrenner-agi-thesis
  18. [18] 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)
  19. [19] 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)
  20. [20] leopold aschenbrenner hit $20b aum at situational awareness. 270% this year through may. 1000% since inception. — reactive:aschenbrenner-nebius-fund (2026-06-08)
  21. [21] Jane Street has invested in Situational Awareness, the high-profile AI-focused hedge fund run by 24-year-old Leopold Asc... — reactive:aschenbrenner-nebius-fund (2026-06-08)
  22. [22] 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)
  23. [23] $5B Situational Awareness LP Portfolio / Leopold Aschenbrenner — reactive:aschenbrenner-nebius-fund
  24. [24] Leopold Aschenbrenner's $5.5B Situational Awareness Fund — reactive:aschenbrenner-agi-thesis
  25. [25] Situational Awareness Portfolio | Leopold Aschenbrenner 13F Holdings & Trades — reactive:aschenbrenner-agi-thesis
  26. [26] Jim Cramer on Leopold Aschenbrenner's $NBIS stake “When this ... — reactive:aschenbrenner-nebius-fund
  27. [27] 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)
  28. [28] 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)
  29. [29] Why I'm Skeptical of AGI Timelines (And You Should Be Too) — reactive:aschenbrenner-nebius-fund
  30. [30] Debunking the Hype: Artificial General Intelligence by 2027? — reactive:aschenbrenner-nebius-fund
  31. [31] Nebius Stock Surges on Backing From This Big AI Investor - Barron's — reactive:aschenbrenner-nebius-fund
  32. [32] 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)
  33. [33] 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)
  34. [34] BREAKING: A 24-year-old former OpenAI researcher just became one of the largest hedge fund managers on Wall Street. — reactive:aschenbrenner-nebius-fund (2026-06-09)
  35. [35] SITUATION EXPLAINED: One AGI-pilled essay turned into a $20B fund in under 2 years. — reactive:aschenbrenner-nebius-fund (2026-06-08)
  36. [36] Situational Awareness LP AUM History: 13F Portfolio Value Over Time — reactive:aschenbrenner-nebius-fund
  37. [37] This AI stock is surging after an ex-OpenAI employee's fund disclosed a stake. Here's why - CNBC — reactive:aschenbrenner-nebius-fund
  38. [38] 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
  39. [39] Leopold Aschenbrenner's Situational Awareness Fund Just Bought This Nvidia-Backed Neocloud Stock — reactive:aschenbrenner-nebius-fund
  40. [40] Beyond Hyperscalers: Why Leopold Aschenbrenner Just Bought 5.6% of Nebius — reactive:aschenbrenner-nebius-fund
  41. [41] Fund Update: Leopold Aschenbrenner's Situational Awareness LP ... — reactive:aschenbrenner-nebius-fund
  42. [42] Nebius Stock Is Up 170% in 2026, and Leopold Aschenbrenner Just Bought a 5.6% Stake. Here's Why — reactive:aschenbrenner-nebius-fund
  43. [43] Nebius Stock Is Up 170% in 2026, and Leopold Aschenbrenner Just Bought a 5.6% Stake. Here's Why - AOL — reactive:aschenbrenner-nebius-fund
  44. [44] Nebius Surges 11% Pre-Market, Former OpenAI Researcher Aschenbrenner Bets Big — reactive:aschenbrenner-nebius-fund
  45. [45] Leopold Aschenbrenner's Situational Awareness fund discloses 5.6 ... — reactive:aschenbrenner-nebius-fund
  46. [46] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-05-27)
  47. [47] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-06-01)
  48. [48] 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)
  49. [49] If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-05)
  50. [50] RT @USFunds: If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-06)
  51. [51] RT @USFunds: If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-06)
  52. [52] RT @USFunds: If you’re not familiar with the name Leopold Aschenbrenner, you should be. — reactive:aschenbrenner-nebius-fund (2026-06-05)
  53. [53] Leopold Aschenbrenner's Situational Awareness LP disclosed a 5.6 ... — reactive:aschenbrenner-nebius-fund
  54. [54] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-05-27)
  55. [55] RT @burrytracker: Breaking: Leopold Aschenbrenner just disclosed one of his largest holdings — reactive:aschenbrenner-nebius-fund (2026-05-27)
  56. [56] $IREN news ‼️ ALERT IREN has closed a $3.65bn investment-grade GPU financing facility — reactive:aschenbrenner-nebius-fund (2026-06-02)
  57. [57] $IREN news ‼️ ALERT IREN has closed a $3.65bn investment-grade GPU financing facility — reactive:aschenbrenner-nebius-fund (2026-06-02)
  58. [58] 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)