GSM · Ferroglobe PLC

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$3.36 +0.06 (+1.67%) At close · Jul 28

Market Cap

$616.64M

186.86M

Options Chain

15-min delayed Underlying $3.36 · today Options Calculator

Positioning

Aug 21, 2026 · 23 days to expiry · 16 contracts

Put / call OI

0.01

Call-heavy positioning

Open interest

contracts outstanding

Volume

traded today

Max pain

$3.00

$0.36 below spot

ATM implied vol

25.7%

market's expected move

Open interest by strike

Calls Puts

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 23d Sep 18 51d Dec 18 142d Jan 15 170d Mar 19 233d Jan 21 541d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	—	—	—		—	—	—	—	0
Call · $1 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $1 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	—	—	—		—	—	—	—	0
Call · $2 In the money Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $2 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
0	—	25.7%	0.98	—		$0.15	—	—	1	1
Call · $3 In the money Last — Breakeven — Implied vol 25.7% Delta 0.98 ≈98% ITM Gamma 0.21 Theta 0 Vega 0 Open interest 0 Model this call Put · $3 Last $0.15 Breakeven $2.85 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
Underlying $3.36
48	1	120.8%	0.364	$0.05		—	-0.622	128.5%	—	0
Call · $4 Last $0.05 Breakeven $4.05 Implied vol 120.8% Delta 0.364 ≈36% ITM Gamma 0.358 Theta -0.008 Vega 0.003 Open interest 48 Model this call Put · $4 In the money Last — Breakeven — Implied vol 128.5% Delta -0.622 ≈62% ITM Gamma 0.343 Theta -0.009 Vega 0.003 Open interest 0 Model this put
50	6	—	—	$0.06		—	-0.735	174.5%	—	0
Call · $5 Last $0.06 Breakeven $5.06 Implied vol — Delta — Gamma — Theta — Vega — Open interest 50 Model this call Put · $5 In the money Last — Breakeven — Implied vol 174.5% Delta -0.735 ≈74% ITM Gamma 0.217 Theta -0.01 Vega 0.003 Open interest 0 Model this put
0	—	—	—	—		—	-0.826	188.4%	—	0
Call · $6 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $6 In the money Last — Breakeven — Implied vol 188.4% Delta -0.826 ≈83% ITM Gamma 0.159 Theta -0.009 Vega 0.002 Open interest 0 Model this put
0	—	—	—	—		—	-0.772	263.4%	—	0
Call · $7 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $7 In the money Last — Breakeven — Implied vol 263.4% Delta -0.772 ≈77% ITM Gamma 0.133 Theta -0.014 Vega 0.003 Open interest 0 Model this put
0	—	—	—	—		—	-0.784	291.3%	—	0
Call · $8 Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $8 In the money Last — Breakeven — Implied vol 291.3% Delta -0.784 ≈78% ITM Gamma 0.117 Theta -0.015 Vega 0.002 Open interest 0 Model this put

About this data

Greeks, implied volatility, open interest and the last price come from the latest daily snapshot and are 15-minute delayed. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown. Max pain is the listed strike where the most open interest would expire worthless — a positioning reference, not a forecast.

Key facts CIK 1639877 CUSIP G33856108 13F (30d) 25 filings 25 filers Visit website Investor relations