How to Buy aTyr Pharma, Inc. Common Stock (ATYR) Stock

Where to buy ATYR

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

Broker	Commission	Fractional	Extended	Overnight	Options	OTCQX	OTCQB	Pink Cur.	Pink Ltd.	Grey	Surcharge	Short locate
FirstradeReview	$0	~4,000+ tickers, ≥ $5		~1,200	$0	Full	Full	Full	Full	Limited	—	limited
Interactive BrokersReview	$0 (Lite) / per-share (Pro)			~10,000	per-contract pricing	Full	Full	Full	Full	Full	Per-share pricing applies	best
TradeStationReview	$0 listed				$0.50 / $0.60	Full	Full	Full	Full	Limited	$0.005/share OTC (TS Select/TS Go), $0 up to 10,000 shares	strong
Charles Schwab (thinkorswim)Review	$0	Schwab Stock Slices, S&P 500 only, ≥ $5/slice, up to 30 at once		~1,130	$0.65	Full	Full	Full	Limited	Limited	Variable service fees on certain restricted	moderate
E*TRADE (Morgan Stanley)Review	$0 listed			~20	$0.65	Full	Full	Full	Full	Limited	$6.95 flat on penny stocks	moderate
FidelityReview	$0	Stocks by the Slice, 7,000+ stocks/ETFs, from $1			$0.65	Full	Full	No	No	No	—	limited
Merrill EdgeReview	$0				$0.65	Full	Full	Full	Limited	No	—	none
MoomooReview	$0				$0	Limited	Limited	Limited	No	No	—	limited
Public.comReview	$0				rebate model	Limited	Limited	Limited	No	No	—	none
SoFi Active InvestingReview	$0				$0	Full	Limited	Limited	No	No	—	none
tastytradeReview	$0 stocks				$1.00 open, $0 close (capped at $10 per leg)	Limited	Limited	Limited	No	No	—	limited
WebullReview	$0				$0	Limited	Limited	Limited	No	No	—	limited
CenterPoint SecuritiesReview	Per-share (day-trader oriented)				per-contract	Full	Full	Full	Full	Full	Per-share	best
Cobra TradingReview	Per-share (day-trader oriented)				per-contract	Full	Full	Full	Full	Full	Per-share	best
SpeedTraderReview	Per-share (day-trader oriented)				per-contract	Full	Full	Full	Full	Full	Per-share	best

24-Hour / Overnight trading

ATYR 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.

Penny stock / OTC routing

ATYR 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 aTyr Pharma, Inc. Common Stock

aTyr Pharma Inc is a clinical-stage biotechnology company focused on developing therapies for fibrosis and inflammatory conditions. Its research leverages tRNA synthetase biology to identify potential therapeutic targets. The company's discovery platform uses a proprietary library of domains derived from tRNA synthetases to explore signaling pathways. Its flagship clinical candidate, efzofitimod, is a novel biologic immunomodulatory in development for the treatment of interstitial lung disease (ILD).

Sector

BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)

Employees

58

Headquarters

SAN DIEGO, CA

Listed

2015-05-07

Market cap

$52.03M

Frequently asked

Where can I buy aTyr Pharma, Inc. Common Stock (ATYR)?

ATYR 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 ATYR after hours or overnight?

Yes. ATYR 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 ATYR?

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

Does Fidelity offer ATYR?

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

Does Webull offer ATYR?

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

Is ATYR optionable?

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

Is there a tokenized version of ATYR?

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 ATYR?

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