Bloomberg Stock Movers
2026-06-23 · Hosted by — · Bloomberg / iHeartMedia
Executive Summary
A short pre-market roundup detailing a sharp tech pullback led by memory stocks: Micron fell nearly 9% and Sandisk over 9% ahead of Micron’s earnings, with the SOXX ETF down 6%. The selloff traced to an overnight 10% plunge in Korea’s KOSPI (weighed by Samsung and SK Hynix) and a report that SK Hynix is shifting toward mass-production DRAM rather than high-margin HBM, sparking AI-demand-slowing fears. SpaceX continued its slide, trading at $149.75 pre-market (down 3%, below its trading debut open), having erased $400 billion in market cap Monday. On the upside, IBM climbed 4% after joining OpenAI’s cyber partner program and receiving a JPMorgan upgrade.
Key Stories & Changes
1. Memory Stocks Lead Tech Selloff
Micron (MU) down nearly 9% pre-market; Sandisk (SNDK) down over 9%; SOXX ETF down 6%
Korea’s KOSPI fell 10% overnight, weighed by Samsung and SK Hynix; heavy retail activity in single-leverage memory-tracking ETFs added volatility
Korean media report: SK Hynix shifting focus to mass-production DRAM rather than specialized HBM (high-bandwidth memory), sparking speculation of slowing AI data-center demand — HBM prices run ~4x the broader counterpart
Micron has accounted for nearly a fifth of the S&P 500’s gains this year — the single biggest driver — and reports earnings the next day
2. SpaceX Slide Continues
SpaceX trading at $149.75 pre-market, down 3%, below where it opened on its trading debut
Monday’s plunge erased $400 billion in market cap — the second-biggest single-day wipeout for any company, surpassed only by Nvidia
Down over $600 billion from its peak; building itself as an AI play amid sector pressure, and coming to the debt market for $20 billion shortly after its IPO
Received a new Susquehanna rating (neutral, price target $170), well above the current level
3. IBM Climbs on OpenAI Cyber Partnership
IBM (IBM) up 4%, the biggest large-cap pre-market gainer, after joining OpenAI’s cyber partner program to use frontier AI to counter cybersecurity threats within enterprise environments
Microsoft up 1% (large OpenAI stake); JPMorgan upgraded IBM to overweight from neutral
MU: Micron — -9% (pre-mkt) — Memory selloff ahead of earnings; top S&P driver YTD
SNDK: Sandisk — -9% (pre-mkt) — Caught in memory route
SPACEX: SpaceX — -3% (pre-mkt) — Below debut open; $400B wiped Monday
IBM: IBM — +4% (pre-mkt) — OpenAI cyber partnership + JPMorgan upgrade
MSFT: Microsoft — +1% (pre-mkt) — Benefits from OpenAI stake
Trends Identified
1. Memory Demand Fears Crack the AI Trade
The SK Hynix DRAM-over-HBM report and the KOSPI’s 10% drop suggest the market is suddenly questioning the durability of AI-driven memory demand. With Micron the single largest contributor to S&P 500 gains this year, its earnings become a referendum on whether the memory rally’s narrative holds.
2. SpaceX’s Round Trip
SpaceX retracing below its trading-debut open and erasing $400 billion in a day — the second-largest single-day wipeout ever — signals fading speculative appetite for its AI-play narrative even as it taps the debt market for $20 billion.
3. Enterprise AI Security as a Bright Spot
IBM’s gain on the OpenAI cyber partnership, plus Microsoft’s lift, points to enterprise AI security and frontier-AI partnerships as a pocket of strength bucking the broader tech selloff. —-
Sentiment Analysis
Overall Market Sentiment: Risk-Off (Tech)
A clearly negative pre-market tone for tech, concentrated in memory and semis, with selective strength in AI-security names.
Risk Factors Highlighted
Slowing AI memory demand: SK Hynix’s pivot to DRAM over HBM raises fears of softening AI data-center demand.
Micron earnings concentration risk: Micron is ~20% of the S&P 500’s YTD gains — a disappointing report would weigh heavily.
Leverage-ETF volatility: Heavy retail use of single-leverage memory ETFs in Korea is amplifying swings.
SpaceX downside: Trading below its debut open and near record lows after a $400B single-day wipeout.
SpaceX debt overhang: Coming to the market for $20 billion shortly after its IPO raise.
This episode was covered in today’s The Market Signal — 2026-06-23, a cross-source synthesis of multiple podcast reports.