How to Buy MKS Inc. Common Stock (MKSI) Stock

Where to buy MKSI

13 brokers in our matrix offer MKSI. 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

MKSI 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.

About MKS Inc. Common Stock

MKS Inc delivers foundational technology solutions for leading edge semiconductor manufacturing, electronics and packaging, and specialty industrial applications. The company provides instruments, components, subsystems, systems, process control solutions, and specialty chemicals technology that improve process performance and optimize productivity. Its solutions address challenges of miniaturization and complexity in device manufacturing, enabling increased power, speed, and feature enhancement. MKS Inc operates through three divisions: Vacuum Solutions Division (VSD), Photonics Solutions Division (PSD), and Materials Solutions Division (MSD). The company operates in the United States, which generates maximum revenue, as well as China and other countries.

Sector

INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL

Employees

10,300

Headquarters

ANDOVER, MA

Listed

1999-03-30

Market cap

$21.04B

Frequently asked

Where can I buy MKS Inc. Common Stock (MKSI)?

MKSI 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 MKSI after hours or overnight?

Yes. MKSI 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 MKSI?

Yes. Robinhood offers MKSI as a regular exchange-listed security.

Does Fidelity offer MKSI?

Yes. Fidelity offers MKSI as a regular exchange-listed security.

Does Webull offer MKSI?

Yes. Webull offers MKSI as a regular exchange-listed security.

Is MKSI optionable?

Yes. MKSI has listed options contracts. Per-contract pricing varies by broker — see the Options column in the matrix.

Is there a tokenized version of MKSI?

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 MKSI?

Yes. Multiple brokers in the matrix support fractional shares for MKSI — see the Fractional column above for per-broker eligibility and minimums.