The Circuit Brief

The AI Boom Runs on Borrowed Money, and Borrowing Just Got Expensive

Sunday edition, October 11, 2026. Markets are closed, so we step back to look at the money under the AI boom. US companies have sold about $1.7 trillion of corporate bonds this year, up roughly 30% even as yields climbed toward 6%, and a large share is tied to AI data centers, chips and power. SpaceX is reportedly in early talks to borrow about $40 billion for Nvidia chips, and default-insurance costs for SpaceX, Oracle and Broadcom have hit records. Plus the week ahead: Columbus Day, JPMorgan, Goldman, Wells Fargo, Bank of America and Morgan Stanley earnings, Wednesday's September CPI, and results from ASML and TSMC. AI-narrated. Not investment advice.

A Friday Rebound, Delta's Fuel Bill, and the Week Inflation Comes Back

Saturday edition, October 10, 2026. Stocks rebound on Friday and all three major indexes finish the week higher, with the S&P 500 near its record. Cloud and software lead while chip makers lag after Thursday's OpenAI revenue scare. Delta cuts its 2026 profit outlook after a 62% jump in fuel costs. Brent just under $103, the 10-year near 5.25%, gold near $4,175. Week ahead: Columbus Day bond holiday, bank earnings (Citi, Wells Fargo, JPMorgan, Bank of America), ASML and TSMC, and Wednesday's September CPI report.

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OpenAI's Missing Twenty Billion, a Chip Selloff, and a Fed That Still Wants One More Hike

Friday edition, October 9, 2026. Thursday close: Nasdaq 27,193.34 (-1.25%, worst day since mid-August), S&P 500 7,765.36 (-0.47%), Dow 51,231.64 (+0.1%). The Financial Times reported OpenAI told investors its annualized revenue was near $50B at end-September, ~$20B below the ~$70B widely reported (different revenue accounting vs Anthropic). Chips fell: Arm and Marvell -6%+, Intel and Micron -5%+, Nvidia ~-2.9%. TSMC September revenue ~NT$511.86B (-0.6% m/m, +54.6% y/y). Fed September minutes: most officials see another hike likely by year-end. 10-year ~5.23%. Oil jumped 5% on Iran-strike reports, then pared after Trump ruled out an attack before the midterms: WTI ~$91, Brent ~$104. PepsiCo Q3 revenue $25.27B (+5.6%). Not investment advice. AI-narrated.

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A Record Close, Marvell's Twenty-Billion-Dollar Promise, and the Fed's Notes From September

Wednesday edition, October 7, 2026. Record closes Tuesday: S&P 500 7,818.93 (+0.58%), Nasdaq 27,599.79 (+0.45%); Dow 51,521.28 (+0.49%). 10-year yield ~5.275%, WTI ~$87.77, Brent ~$98.67. Marvell raised its fiscal 2028 revenue target to ~$20B from $18B at its investor day (+~7%); Nvidia near $6T. September ISM services 54.9, prices index 74 (highest since July 2022). Paramount-WBD merger closed (Skydance -2.7% on debut). Today: minutes of the Fed's September meeting. Not investment advice. AI-narrated.

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Oil Holds Still, and the Market Waits on Services

Monday edition, October 5, 2026. OPEC+ core members kept November output targets unchanged (about 31.1 million bpd), extending the pause begun in October; Brent settled near $102.25 Friday and edged up Sunday night, WTI near $91. The 10-year Treasury yield stays near its highest in over two decades. Futures opened flat; South Korea closed for a holiday. Today: ISM services for September (about 55 expected vs 55.4). Ahead: Marvell investor day and the Paramount-WBD close (Tue), September FOMC minutes (Wed), bank earnings next week. Not investment advice. AI-narrated.

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Chips in Orbit, and a Quiet Week Before the Storm

Sunday weekend edition, October 4, 2026. Google's AI chips (TPUs) went into orbit on SpaceX's Transporter-18 mission as the first in-orbit test of Project Suncatcher, which asks whether commercial AI chips can survive space. AI is increasingly being used to design chips (OpenAI's Broadcom-built inference chip, Synopsys' new AI tools). Week ahead: ISM services (Mon), Marvell investor day and the expected Paramount-Warner Bros. Discovery close (Tue), September FOMC minutes (Wed), PepsiCo, Delta and Constellation Brands earnings, and a Microsoft Windows/Surface AI event. Not investment advice. AI-narrated.

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Twenty-Nine Thousand Jobs, and a Market That Cheered

Weekend edition, October 3, 2026. The September jobs report shows just 29,000 jobs added (about 84,000 expected), unemployment up to 4.2%, and downward revisions erasing about 60,000 earlier jobs. Why markets cheered: rate-hike odds faded, the 10-year yield fell from its 2002-era high to about 5.18%, and stocks rallied (S&P 500 7,723, Dow 51,177, Nasdaq 27,191; Nasdaq 100 at a record). Brent slips below $100. Nvidia hits a record near $238 and $5.7 trillion, and why falling rates help AI chip stocks most. Plus the week in review.

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A Yield Record, a Quiet Comeback, and the Jobs Number That Decides the Week

Friday briefing, October 2, 2026. The 10-year Treasury yield breaks a level last seen in April 2002, then eases to about 5.24%, and stocks claw back to finish slightly higher (S&P 500 7,666, Dow 50,927, Nasdaq 26,872). Jobless claims fall to 197,000; the September ISM manufacturing index holds at 54.5 with price pressures surging on metals, tariffs and oil. Chip stocks lead on Micron's record quarter, and why the AI bottleneck has moved from accelerators to memory and manufacturing. Ahead: today's September jobs report (about 90-98K expected, unemployment 4.1%).

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Cooler Inflation, a Record Chip Quarter, and a Split Quarter-End

Thursday, October 1, 2026. August PCE inflation cools to 3.4% (core 3.0%), both below forecasts, and ADP adds 90,000 jobs - but 10-year Treasury yields near 5.29% keep stocks mixed as Q3 closes: S&P 500 7,651, Dow 50,906, Nasdaq 26,861. The Nasdaq led September and the quarter while the Dow lagged. Brent eases near $103 as Middle East exports recover to ~98% of pre-war levels. Micron posts a record $54.2B quarter with 87% gross margin and guides to $61.5B on AI memory demand - what it says about the HBM bottleneck. Ahead: jobless claims today, the September jobs report Friday.

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The Circuit Brief — The Highest Yield Since 2007, and the Data That's About to Test It

Good morning. This is The Circuit Brief. Monday's selloff carried straight through the close. The S&P 500 fell roughly seven tenths of a percent to finish near seven thousand six hundred eighty-four.

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The Offer vs. the Strait: A US-China Deal Meets a Closed Hormuz

Monday, September 28, 2026. A US-China trade deal cutting tariffs on $30B of goods each way was announced -- but the Strait of Hormuz staying closed after Trump rejected Iran's reopening offer pushed oil and the 10-year yield higher, and stocks fell anyway. Plus: chip export controls left out of the trade deal, and what's ahead this week -- JOLTS and consumer confidence Tuesday, PCE inflation and Micron earnings Wednesday, the September jobs report Friday.

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The Circuit Brief — The Offer That Didn't Land

Trump rejects Iran's seven-day Hormuz reopening offer, putting Friday's oil relief at risk. Plus the week ahead: PCE inflation, Micron earnings, U.S.-China trade details, the AI executives' White House meeting, and Friday's jobs report.

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The Circuit Brief — A Green Finish to a Red Week

Stocks close a volatile week higher as oil eases on Hormuz reopening talk, while the 10-year yield holds near 2007 highs. Consumer inflation expectations jump to 4.6%, durable goods beat, Akamai lands an $11.6B AI cloud deal, and the week ahead: China trade details and Micron earnings.

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The Circuit Brief — The Market Holds Its Breath

After two rough sessions, stocks stood still: the 10-year yield holds near 2007 highs, the Philly Fed's Paulson signals more hikes may be needed, jobless claims fall to 197K, and Brent swings to $106 on Houthi strikes and Hormuz reopening talk. Plus: why Micron's Sept 30 report is the AI buildout's next big test.

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The Circuit Brief — Yields Do the Talking

Treasury yields hit their highest level since 2007 after strong PMI data raised the odds of another Fed hike, sending stocks lower again. Oil back above $100, Indian markets reverse on the same pressures, and three Fed officials speak today.

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The Circuit Brief — The Hike Finally Came

The Fed's first rate hike since 2023 lands, U.S. markets split between AI infrastructure names and rate-sensitive names, oil keeps easing, India falls on the same rate news, and Alibaba unveils a credible domestic AI chip aimed at reducing dependence on Nvidia hardware.

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The Circuit Brief — The Week That Changed the Rate Map

The Circuit Brief. Your evening edition - what moved this week.

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The Circuit Brief — The Recovery with an Asterisk

The Circuit Brief. Your evening edition - what moved today.

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The Circuit Brief — The Jobs Report Changed the Map

The Circuit Brief. Your daily briefing on AI, electronics, and engineering - what actually matters, in plain language.

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The Circuit Brief — The Relief Test

The Circuit Brief. Your evening edition - what moved today.

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