Nvidia CEO Huang resigns over affairs, CFO Kress takes over as interim chiefPutin holds firm on territory and troops as Europe gets a seat at next talksTrump says US needs no Iran deal and pulls Vance from talksNvidia falls below $4tn as CEO Huang resigns, hitting AI stocksIsraeli strike on Gaza's Nasser Hospital kills surgeon despite ceasefireMSF and Africa CDC warn Congo Ebola response is falteringRussia and Ukraine trade strikes as Starshield curbs hamper Ukrainian defencesTwo tankers burn in Hormuz and another is hit off UAE coastHouthis claim strikes on Saudi Aramco and airbases as Yemen displacement passes 320,000Brooklyn collapse toll reaches eight as rescue search endsUS and China discuss trilateral summit with Russia after Rubio-Wang callChina says US is using Nvidia scandal as pretext for tech curbsIsrael readies for possible Iran strike as Netanyahu and Eisenkot clashIndonesian vice president resigns after courts reject school credentialsXi says Taiwan 'reunification' will happen, Taipei rejects itTrump threatens to double tariffs on Mexico over migrantsFourteen killed in 23-vehicle crash and fire in FujairahFed hike expectations lift yields and weigh on Asian currenciesTen police officers and 18 fighters killed in northwest Pakistan attackEurope demands a say in security decisions as diplomats gather in DublinSpain passes housing protections after general strike clashesBaby dies of cold in Gaza as 53 countries and organizations urge unrestricted aidNew hoax bomb threats target more than 1,800 Italian schoolsEU and UK prepare new Russia sanctionsSpaceX plans $74bn data-centre investment in Texas and ArizonaAmnesty says UN and South Sudan officials failed to prevent village massacreIndia's inflation tops RBI limit as rupee falls to 94 per dollarTwo Iranian men convicted in UK of spying on journalists for IranMercedes halts investment in Germany as IG Metall calls full-day strikesOil falls below $90 for first time since August as investors weigh US-Iran diplomacyOne killed and four wounded in shooting near White House in WashingtonSoftBank and Nvidia back Agile Robots at $8.5bn valuationUS existing home sales hit lowest level since 2010Dutch coalition nears collapse over wealth taxUkraine-founded naval drone maker UForce valued at $6bnChina approves Eli Lilly's weight-loss pill orforglipronUK economy grows 0.7% in third quarter, most in two and a half yearsKazakh sovereign fund and railway heads arrested on suspicion of corruptionNorth Korea warns US and allies of 'concrete actions' over submarine buildupNvidia CEO Huang resigns over affairs, CFO Kress takes over as interim chiefPutin holds firm on territory and troops as Europe gets a seat at next talksTrump says US needs no Iran deal and pulls Vance from talksNvidia falls below $4tn as CEO Huang resigns, hitting AI stocksIsraeli strike on Gaza's Nasser Hospital kills surgeon despite ceasefireMSF and Africa CDC warn Congo Ebola response is falteringRussia and Ukraine trade strikes as Starshield curbs hamper Ukrainian defencesTwo tankers burn in Hormuz and another is hit off UAE coastHouthis claim strikes on Saudi Aramco and airbases as Yemen displacement passes 320,000Brooklyn collapse toll reaches eight as rescue search endsUS and China discuss trilateral summit with Russia after Rubio-Wang callChina says US is using Nvidia scandal as pretext for tech curbsIsrael readies for possible Iran strike as Netanyahu and Eisenkot clashIndonesian vice president resigns after courts reject school credentialsXi says Taiwan 'reunification' will happen, Taipei rejects itTrump threatens to double tariffs on Mexico over migrantsFourteen killed in 23-vehicle crash and fire in FujairahFed hike expectations lift yields and weigh on Asian currenciesTen police officers and 18 fighters killed in northwest Pakistan attackEurope demands a say in security decisions as diplomats gather in DublinSpain passes housing protections after general strike clashesBaby dies of cold in Gaza as 53 countries and organizations urge unrestricted aidNew hoax bomb threats target more than 1,800 Italian schoolsEU and UK prepare new Russia sanctionsSpaceX plans $74bn data-centre investment in Texas and ArizonaAmnesty says UN and South Sudan officials failed to prevent village massacreIndia's inflation tops RBI limit as rupee falls to 94 per dollarTwo Iranian men convicted in UK of spying on journalists for IranMercedes halts investment in Germany as IG Metall calls full-day strikesOil falls below $90 for first time since August as investors weigh US-Iran diplomacyOne killed and four wounded in shooting near White House in WashingtonSoftBank and Nvidia back Agile Robots at $8.5bn valuationUS existing home sales hit lowest level since 2010Dutch coalition nears collapse over wealth taxUkraine-founded naval drone maker UForce valued at $6bnChina approves Eli Lilly's weight-loss pill orforglipronUK economy grows 0.7% in third quarter, most in two and a half yearsKazakh sovereign fund and railway heads arrested on suspicion of corruptionNorth Korea warns US and allies of 'concrete actions' over submarine buildup
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Symbolic image: Jane Street books about $15bn loss after Situational Awareness slumpSymbolic image

Jane Street books about $15bn loss after Situational Awareness slump

2 sources

The Wall Street Journal reports that Jane Street lost about $15 billion after trouble at the AI fund Situational Awareness. Its assets fell by more than two thirds within a single month.

The Journal's account so far consists of the headline figure alone, with no breakdown of how the position was built or when the loss was booked. The South China Morning Post traces the drawdown at Leopold Aschenbrenner's US hedge fund to roughly 50 days of market turmoil, in which technology stocks gave back the sharp gains they had made earlier in the year. Neither outlet describes how the positions of the two firms were linked.

Losses reach first-time managers in China

The South China Morning Post reports that the two debut portfolios of Yuan Zeqiang at Caitong Fund Management fell 36 and 33 per cent between his appointment on Thursday, 11 June, and 30 July. They carried a combined 7.28 billion yuan (US$1.08 billion) at the end of the second quarter, an unusually large mandate for a first-time manager, and their heavy technology weighting drove the decline.

Other opinions

The Wall Street Journal builds the day around the $15 billion figure at Jane Street; the South China Morning Post, in Hong Kong, tells the same sell-off through first-time Chinese fund managers and does not cite that figure.

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