How to Buy Monolithic Power Systems, Inc. (MPWR) Stock
Compare 13 brokers offering MPWR, check 24-hour trading availability, see options pricing, and find fractional-share eligibility.
- Day range
- $1,519.92 – $1,565.00
- 52-week range
- $643.36 – $1,675.42
- Volume
- 26.7K
- Market cap
- $76.31B
Where to buy MPWR
13 brokers in our matrix offer MPWR. Verify availability and current fees with each broker before trading.
| Broker | Commission | Fractional | Extended | Overnight | Options | OTC access |
|---|---|---|---|---|---|---|
 Charles Schwab (thinkorswim)Review | $0 | Schwab Stock Slices, S&P 500 only, ≥ $5/slice, up to 30 at once | ~1,130 | $0.65 | Most (3/5) | |
 E*TRADE (Morgan Stanley)Review | $0 listed | ~20 | $0.65 | Most (4/5) | ||
 FidelityReview | $0 | Stocks by the Slice, 7,000+ stocks/ETFs, from $1 | $0.65 | Partial (2+0) | ||
 FirstradeReview | $0 | ~4,000+ tickers, ≥ $5 | ~1,200 | $0 | Most (4/5) | |
 Interactive BrokersReview | $0 (Lite) / per-share (Pro) | ~10,000 | per-contract pricing | Full | ||
 Merrill EdgeReview | $0 | $0.65 | Most (3/5) | |||
 MoomooReview | $0 | $0 | Limited only | |||
 Public.comReview | $0 | rebate model | Limited only | |||
 RobinhoodReview | $0 | ≥ $1 stocks, market cap ≥ $25M | ~1,134 | $0 | None | |
 SoFi Active InvestingReview | $0 | $0 | Partial (1+2) | |||
 tastytradeReview | $0 stocks | $1.00 open, $0 close (capped at $10 per leg) | Limited only | |||
 TradeStationReview | $0 listed | $0.50 / $0.60 | Most (4/5) | |||
 WebullReview | $0 | $0 | Limited only |
24-Hour / Overnight trading
MPWR may be eligible for overnight trading via Charles Schwab (thinkorswim), Interactive Brokers, Robinhood, E*TRADE (Morgan Stanley), Webull, Moomoo, Firstrade. Each broker maintains its own eligibility list — confirm before placing an order.
Overnight sessions route through ATSs, typically have wider spreads, accept limit orders only, and offer no guaranteed fills.
About Monolithic Power Systems, Inc.
- Sector
- SEMICONDUCTORS & RELATED DEVICES
- Employees
- 4,501
- Headquarters
- WEST PALM BEACH, FL
- Listed
- 2004-11-19
- Market cap
- $76.31B
Frequently asked
Where can I buy Monolithic Power Systems, Inc. (MPWR)?
MPWR is offered by 13 brokers in our matrix, including Charles Schwab (thinkorswim), E*TRADE (Morgan Stanley), Fidelity, Firstrade, Interactive Brokers. Compare commissions, fractional eligibility, and overnight availability in the broker matrix above.
Can I buy MPWR after hours or overnight?
Yes. MPWR is on the 24-hour eligibility list for Charles Schwab (thinkorswim), Interactive Brokers, Robinhood, E*TRADE (Morgan Stanley), and others. Overnight sessions route through ATSs with wider spreads and limit-orders only.
Does Robinhood offer MPWR?
Yes. Robinhood offers MPWR as a regular exchange-listed security.
Does Fidelity offer MPWR?
Yes. Fidelity offers MPWR as a regular exchange-listed security.
Does Webull offer MPWR?
Yes. Webull offers MPWR as a regular exchange-listed security.
Is MPWR optionable?
Yes. MPWR has listed options contracts. Per-contract pricing varies by broker — see the Options column in the matrix.
Is there a tokenized version of MPWR?
Not in our current dataset. The tokenized stock universe (Kraken xStocks, Binance Alpha/Ondo, Robinhood EU, Hyperliquid HIP-3) is expanding quickly — we refresh quarterly.
Can I buy a fractional share of MPWR?
Yes. Multiple brokers in the matrix support fractional shares for MPWR — see the Fractional column above for per-broker eligibility and minimums.