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How to Buy GridAI Technologies Corp. Common Stock (GRDX) Stock

Compare 15 brokers offering GRDX, check 24-hour trading availability, and confirm OTC tier access.

GRDX
$4.13+$0.2850 (+7.42%)
Day range
$3.68 – $4.25
52-week range
$1.87 – $5.30
Volume
54.8K
Market cap
$23.81M
Exchange
XNAS
Asset class
common
Optionable
No
24-hour trading
Yes
Fractional eligible
Yes
Tokenized
No
Market cap tier
nano

Where to buy GRDX

15 brokers in our matrix offer GRDX (penny/OTC-friendly subset). Verify availability and current fees with each broker before trading.

BrokerCommissionFractionalExtendedOvernightOptionsOTCQXOTCQBPink Cur.Pink Ltd.GreySurchargeShort locate
Firstrade logoFirstradeReview$0
~4,000+ tickers, ≥ $5
~1,200
$0FullFullFullFullLimited—limited
Interactive Brokers logoInteractive BrokersReview$0 (Lite) / per-share (Pro)
~10,000
per-contract pricingFullFullFullFullFullPer-share pricing appliesbest
TradeStation logoTradeStationReview$0 listed
$0.50 / $0.60FullFullFullFullLimited$0.005/share OTC (TS Select/TS Go), $0 up to 10,000 sharesstrong
Charles Schwab (thinkorswim) logoCharles Schwab (thinkorswim)Review$0
Schwab Stock Slices, S&P 500 only, ≥ $5/slice, up to 30 at once
~1,130
$0.65FullFullFullLimitedLimitedVariable service fees on certain restrictedmoderate
E*TRADE (Morgan Stanley) logoE*TRADE (Morgan Stanley)Review$0 listed
~20
$0.65FullFullFullFullLimited$6.95 flat on penny stocksmoderate
Fidelity logoFidelityReview$0
Stocks by the Slice, 7,000+ stocks/ETFs, from $1
$0.65FullFullNoNoNo—limited
Merrill Edge logoMerrill EdgeReview$0
$0.65FullFullFullLimitedNo—none
Moomoo logoMoomooReview$0
$0LimitedLimitedLimitedNoNo—limited
Public.com logoPublic.comReview$0
rebate modelLimitedLimitedLimitedNoNo—none
SoFi Active Investing logoSoFi Active InvestingReview$0
$0FullLimitedLimitedNoNo—none
tastytrade logotastytradeReview$0 stocks
$1.00 open, $0 close (capped at $10 per leg)LimitedLimitedLimitedNoNo—limited
Webull logoWebullReview$0
$0LimitedLimitedLimitedNoNo—limited
CenterPoint Securities logoCenterPoint SecuritiesReviewPer-share (day-trader oriented)
per-contractFullFullFullFullFullPer-sharebest
Cobra Trading logoCobra TradingReviewPer-share (day-trader oriented)
per-contractFullFullFullFullFullPer-sharebest
SpeedTrader logoSpeedTraderReviewPer-share (day-trader oriented)
per-contractFullFullFullFullFullPer-sharebest

24-Hour / Overnight trading

GRDX 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.

Penny stock / OTC routing

GRDX trades on the OTC markets. Broker support varies sharply by tier (OTCQX, OTCQB, Pink Current, Pink Limited, Grey). Fidelity and Robinhood exclude pink/grey entirely. For short-locate on small-caps, Interactive Brokers and the day-trader specialists (Cobra Trading, SpeedTrader, CenterPoint) have the deepest inventory.

About GridAI Technologies Corp. Common Stock

GridAI Technologies Corp, formerly known as Entero Therapeutics Inc, is a late clinical-stage biopharmaceutical company focused on the development of targeted, non-systemic therapies for gastrointestinal (GI) diseases. The company's programs address unmet needs in GI health and include: latiglutenase, a Phase 3-ready, potentially first-in-class, targeted, oral biotherapeutic for celiac disease; capeserod, a selective 5-HT4 receptor partial agonist for indications including gastroparesis; and adrulipase, a recombinant lipase enzyme designed to enable the digestion of fats and other nutrients in cystic fibrosis and chronic pancreatitis patients with exocrine pancreatic insufficiency.
Sector
PHARMACEUTICAL PREPARATIONS
Employees
2
Headquarters
BOCA RATON, FL
Listed
2016-10-11
Market cap
$23.81M

Frequently asked

Where can I buy GridAI Technologies Corp. Common Stock (GRDX)?

GRDX is offered by 15 brokers in our matrix, including Firstrade, Interactive Brokers, TradeStation, Charles Schwab (thinkorswim), E*TRADE (Morgan Stanley). Compare commissions, fractional eligibility, and overnight availability in the broker matrix above.

Can I buy GRDX after hours or overnight?

Yes. GRDX 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 GRDX?

No. Robinhood does not provide access to the OTC tier GRDX trades on. Interactive Brokers, TradeStation, and Firstrade have the broadest OTC coverage.

Does Fidelity offer GRDX?

Partial. Fidelity's OTC access is tier-limited — see the OTC columns in the matrix to check whether GRDX's specific tier is supported.

Does Webull offer GRDX?

Partial. Webull's OTC access is tier-limited — see the OTC columns in the matrix to check whether GRDX's specific tier is supported.

Is GRDX optionable?

No. GRDX does not have listed options contracts at the moment.

Is there a tokenized version of GRDX?

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 GRDX?

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