Tech selloff deepens as megacaps stumble; Iran concerns weigh — June 23, 2026
S&P 500 -0.37% · Nasdaq -1.32% · Dow +0.29% · VIX 17.3 — June 23, 2026
The Nasdaq fell 1.32% today as megacap tech rolled over, dragging the S&P 500 down 0.37% despite a small Dow gain. Breadth was decisively negative—58 of the top 100 active stocks fell. The selling wasn't random: JPMorgan issued a blunt verdict on the stock market rally, and geopolitical anxiety over Iran seeped into risk appetite across the board. Asian shares traded mixed on the same tensions. This is a rotation, not a rout, but it's real.
Within the wreckage, the damage split sharply. SpaceX dropped 16.4% amid valuation skepticism, while Redwire fell 9.3% and AST SpaceMobile slid 9.3%—space stocks taking it on the chin. Rivian and Roblox each lost over 8% with no obvious single catalyst beyond sector malaise. But the winners told a different story: Definium Therapeutics soared 49.8% on a promising drug trial, Apogee jumped 46.7% after Wells Fargo endorsed its positioning within AbbVie's portfolio, and Super Micro Computer gained 15.7% riding Nvidia momentum. United Microelectronics hit an all-time high on deal buzz. T1 Energy vaulted 11.2% on S&P index inclusion.
The day's real lesson: companies with clear catalysts and positive news still move, even when the market tilts lower. Growth and mega-cap exposure got hammered. Biotech wins and AI beneficiaries held ground. No insider cluster activity to flag today, but the breadth reading—41 up, 58 down—suggests this isn't a broad-based dip. It's selective pressure on the names that carried the rally.
Market commentary generated from the day's data and headlines — not investment advice.
Biggest moves today
- DFTX (Definium Therapeutics, Inc.) ▲ +49.80% at $36.67 on 20.0M shares — Definium Therapeutics (DFTX) Hits New High on Impressive Drug Candidate Trial (Insider Monkey)
- APGE (Apogee Therapeutics, Inc.) ▲ +46.66% at $132.55 on 61.2M shares — Wells Fargo Maintains Overweight on AbbVie (ABBV), Sees Value in Apogee Acquisition (Insider Monkey)
- SPCX (Space Exploration Technologies ) ▼ -16.43% at $154.60 on 165.6M shares — Is SpaceX Outrageously Overvalued or a Long-Term Investment With Unmatched Potential? (Motley Fool)
- SMCI (Super Micro Computer, Inc.) ▲ +15.66% at $35.46 on 124.4M shares — Super Micro (SMCI) Gets 15.66% Boost from Nvidia-Powered Blueprint (Insider Monkey)
- UMC (United Microelectronics Corpora) ▲ +14.20% at $27.50 on 23.7M shares — United Microelectronics (UMC) Hits All-Time High on New Deal Buzz (Insider Monkey)
- TE (T1 Energy Inc.) ▲ +11.23% at $10.40 on 45.3M shares — T1 Energy (TE) Jumps Double-Digits on S&P Index Inclusion (Insider Monkey)
- RDW (Redwire Corporation) ▼ -9.27% at $13.02 on 29.7M shares — Why Redwire Stock Keeps Dropping (Motley Fool)
- ASTS (AST SpaceMobile, Inc.) ▼ -9.26% at $73.19 on 28.0M shares — AST SpaceMobile, Inc. (ASTS) Suffers a Larger Drop Than the General Market: Key Insights (Zacks)
- RIVN (Rivian Automotive, Inc.) ▼ -8.60% at $15.10 on 26.7M shares — Is Rivian Automotive Stock A Smart Buy Right Now? (Trefis)
- RBLX (Roblox Corporation) ▼ -8.27% at $47.27 on 21.7M shares — Did New Kid-Safe Accounts and TV-Style Ad Metrics Just Shift Roblox's (RBLX) Investment Narrative? (Simply Wall St.)
Most active by volume
| # | Ticker | Price | Change | Volume |
|---|---|---|---|---|
| 1 | AAL | $16.08 | +0.56% | 177.4M |
| 2 | SPCX | $154.60 | -16.43% | 165.6M |
| 3 | SMCI | $35.46 | +15.66% | 124.4M |
| 4 | NOK | $14.43 | +6.97% | 116.2M |
| 5 | KEEL | $6.66 | +5.88% | 109.0M |
| 6 | INTC | $140.94 | +5.19% | 122.4M |
| 7 | NVDA | $208.65 | -0.97% | 115.1M |
| 8 | SOFI | $17.10 | -4.52% | 74.0M |
| 9 | NFLX | $72.88 | -5.82% | 77.8M |
| 10 | F | $14.11 | +0.36% | 66.5M |
| 11 | MARA | $14.85 | +4.43% | 66.8M |
| 12 | APGE | $132.55 | +46.66% | 61.2M |
| 13 | ONDS | $8.89 | -4.10% | 57.8M |
| 14 | PLTR | $119.50 | -6.98% | 56.0M |
| 15 | AMZN | $232.79 | -4.75% | 62.0M |
| 16 | GOOGL | $349.68 | -4.99% | 52.0M |
| 17 | PATH | $10.16 | -1.07% | 51.8M |
| 18 | T | $22.10 | +0.41% | 53.0M |
| 19 | JOBY | $9.86 | -1.40% | 47.7M |
| 20 | AMC | $2.76 | -2.47% | 46.1M |
| 21 | TE | $10.40 | +11.23% | 45.3M |
| 22 | MSFT | $367.34 | -3.18% | 44.1M |
| 23 | MU | $1211.38 | +6.82% | 48.0M |
| 24 | SNAP | $4.63 | -0.64% | 43.5M |
| 25 | TSLA | $405.05 | +1.14% | 47.6M |
Market data from Yahoo Finance; insider data from SEC EDGAR Form 4. For research only — not investment advice. Verify on the official source before trading.
Put this to work
Screen live SEC Form 4 purchases with the insider cluster-buy screener, or open a company dashboard: