Accelerant Holdings Jumps 44% as Earnings Beats Lead Today's Stock Gainers · Aug 13, 2026

Which US stock themes moved on August 13, 2026, which names led them, and the news behind each move.

1. Market at a glance

- S&P 500 (SPY) 778.83 ▲ +1.3% - Nasdaq 100 (QQQ) 733.22 ▲ +2.6% - Russell 2000 (IWM) 304.30 ▲ +2.0% - Dow (DIA) 538.95 ▲ +0.1%

2. Biggest movers, grouped by what drove them

📈 Earnings Beats — Accelerant Holdings topped Q2 earnings and revenue estimates, Birkenstock beat revenue with higher outlook, Aveanna and McGraw Hill both exceeded expectations. - ARX +43.7% — Accelerant Holdings - BIRK +17.5% — Birkenstock Holding plc - AVAH +15.2% — Aveanna Healthcare Holdings Inc. - MH +12.1% — McGraw Hill, Inc. 🤖 AI Infrastructure — Super Micro Computer guided fiscal 2027 revenue well above Wall Street as AI server demand accelerates, with Supermicro soaring on AI infrastructure strength. - SMCI +10.0% — Super Micro Computer, Inc. - NBIS +5.5% — Nebius Group N.V. - CRDO +5.3% — Credo Technology Group Holding Ltd 💻 Semiconductors — No news attached — a flow move, not a catalyst. - ARM +6.0% — Arm Holdings plc - SKHY +5.6% — SK hynix Inc. - INTC +5.2% — Intel Corporation - SNDK +5.2% — Sandisk Corporation ⚡ Clean Energy — SOLV Energy reported Q2 results and X-Energy, Fervo Energy, and EnerSys all advanced as clean energy gains momentum. - MWH +9.4% — SOLV Energy, Inc. - XE +7.4% — X-Energy, Inc. - ENS +6.7% — EnerSys - FRVO +5.6% — Fervo Energy Company ⚛️ Quantum Computing — No news attached — a flow move, not a catalyst. - IQMX +9.7% — IQM Quantum Computers Oyj ☁️ Data & Cloud Infrastructure — No news attached, a flow move, not a catalyst. - GDS +7.8% — GDS Holdings Limited - CIEN +6.3% — Ciena Corporation 📊 Low-Priced Small Caps — No news attached, a flow move, not a catalyst. - TBBB +16.9% — BBB Foods Inc. - RUM +12.1% — RUM Group Inc. - BLSH +11.5% — Bullish - IREN +8.6% — IREN Limited - ZIM +7.4% — ZIM Integrated Shipping Services Ltd. - SHAZ +6.9% — SharonAI Holdings Inc. - RKT +5.9% — Rocket Companies, Inc.

3. What drove the upside

- Accelerant Holdings (ARX) Tops Q2 Earnings and Revenue Estimates - DELL Stock On Track To Top $500 For First Time As AI Server Boom Gets Fresh Fuel From Lenovo, SMCI - SOLV Energy Reports Second Quarter 2026 Financial Results

4. What weighed on it

- CLBT −31.1%, Cellebrite DI Ltd. - REZI −16.5% — Resideo Technologies, Inc. - One group moved with no news attached, flow, not a catalyst.

5. How this was built

Warrants and leveraged ETFs were removed before grouping. They crowd out the underlying names they track. 49 tickers survived that filter. Every number here comes from market data. The theme names and the one-line explanations are written from the day's headlines — where a group moved with no headline behind it, we say so rather than inventing a reason. This is an observation of what moved, not advice and not a recommendation. This tells you where attention went today; it does not tell you what happens next.