CENX · Century Aluminum Co

Track CENX — free

$46.72 +0.33 (+0.71%) At close · Aug 14

Market Cap

$4.62B

98.99M

Options Chain

Underlying $46.72 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 6 days to expiry · 32 contracts · mixed snapshot sessions · May 21, 2026–Aug 14, 2026; 6 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 6d Sep 18 34d Oct 16 62d Nov 20 97d Dec 18 125d Jan 15 153d Mar 19 216d Jan 21 524d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	263.3%	0.977	—		—	-0.042	315.3%	—	0
Call · $25 In the money Snapshot session Unknown Last — Breakeven — Implied vol 263.3% Delta 0.977 ≈98% ITM Gamma 0.003 Theta -0.073 Vega 0.005 Open interest 0 Model this call Put · $25 Snapshot session Unknown Last — Breakeven — Implied vol 315.3% Delta -0.042 ≈4% ITM Gamma 0.005 Theta -0.139 Vega 0.005 Open interest 0 Model this put
22	12	—	—	$17.07		$0.05	-0.018	169.5%	3	253
Call · $30 In the money Snapshot session Aug 4, 2026 Last $17.07 Breakeven $47.07 Implied vol — Delta — Gamma — Theta — Vega — Open interest 22 Model this call Put · $30 Snapshot session Aug 13, 2026 Last $0.05 Breakeven $29.95 Implied vol 169.5% Delta -0.018 ≈2% ITM Gamma 0.004 Theta -0.036 Vega 0.003 Open interest 253 Model this put
15	4	150.9%	0.941	$13.12		$0.05	-0.025	118.7%	8	331
Call · $35 In the money Snapshot session Aug 5, 2026 Last $13.12 Breakeven $48.12 Implied vol 150.9% Delta 0.941 ≈94% ITM Gamma 0.013 Theta -0.09 Vega 0.009 Open interest 15 Model this call Put · $35 Snapshot session Aug 14, 2026 Last $0.05 Breakeven $34.95 Implied vol 118.7% Delta -0.025 ≈3% ITM Gamma 0.008 Theta -0.034 Vega 0.003 Open interest 331 Model this put
93	2	126.6%	0.844	$7.00		$0.12	-0.065	81.4%	11	609
Call · $40 In the money Snapshot session Aug 13, 2026 Last $7.00 Breakeven $47.00 Implied vol 126.6% Delta 0.844 ≈84% ITM Gamma 0.031 Theta -0.15 Vega 0.015 Open interest 93 Model this call Put · $40 Snapshot session Aug 14, 2026 Last $0.12 Breakeven $39.88 Implied vol 81.4% Delta -0.065 ≈6% ITM Gamma 0.025 Theta -0.05 Vega 0.01 Open interest 609 Model this put
692	23	81.9%	0.659	$3.00		$0.75	-0.313	64.6%	31	676
Call · $45 In the money Snapshot session Aug 14, 2026 Last $3.00 Breakeven $48.00 Implied vol 81.9% Delta 0.659 ≈66% ITM Gamma 0.074 Theta -0.151 Vega 0.024 Open interest 692 Model this call Put · $45 Snapshot session Aug 14, 2026 Last $0.75 Breakeven $44.25 Implied vol 64.6% Delta -0.313 ≈31% ITM Gamma 0.09 Theta -0.11 Vega 0.021 Open interest 676 Model this put
Underlying $46.72
841	6	65.4%	0.231	$0.70		$3.40	-0.788	60.8%	1	1.1k
Call · $50 Snapshot session Aug 14, 2026 Last $0.70 Breakeven $50.70 Implied vol 65.4% Delta 0.231 ≈23% ITM Gamma 0.076 Theta -0.098 Vega 0.017 Open interest 841 Model this call Put · $50 In the money Snapshot session Aug 14, 2026 Last $3.40 Breakeven $46.60 Implied vol 60.8% Delta -0.788 ≈79% ITM Gamma 0.078 Theta -0.083 Vega 0.017 Open interest 1.1k Model this put
1.3k	168	80.9%	0.07	$0.14		$7.70	-0.893	94.4%	1	260
Call · $55 Snapshot session Aug 14, 2026 Last $0.14 Breakeven $55.14 Implied vol 80.9% Delta 0.07 ≈7% ITM Gamma 0.027 Theta -0.053 Vega 0.007 Open interest 1.3k Model this call Put · $55 In the money Snapshot session Aug 14, 2026 Last $7.70 Breakeven $47.30 Implied vol 94.4% Delta -0.893 ≈89% ITM Gamma 0.032 Theta -0.08 Vega 0.012 Open interest 260 Model this put
1.4k	17	104.8%	0.039	$0.10		$11.20	-0.965	103.5%	1	2
Call · $60 Snapshot session Aug 14, 2026 Last $0.10 Breakeven $60.10 Implied vol 104.8% Delta 0.039 ≈4% ITM Gamma 0.013 Theta -0.044 Vega 0.007 Open interest 1.4k Model this call Put · $60 In the money Snapshot session Aug 13, 2026 Last $11.20 Breakeven $48.80 Implied vol 103.5% Delta -0.965 ≈97% ITM Gamma 0.013 Theta -0.036 Vega 0.006 Open interest 2 Model this put
329	1	160.1%	0.072	$0.10		$22.10	—	—	2	0
Call · $65 Snapshot session Aug 11, 2026 Last $0.10 Breakeven $65.10 Implied vol 160.1% Delta 0.072 ≈7% ITM Gamma 0.014 Theta -0.107 Vega 0.007 Open interest 329 Model this call Put · $65 In the money Snapshot session Jul 1, 2026 Last $22.10 Breakeven $42.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
366	1	153.1%	0.029	$0.05		$14.70	—	—	6	0
Call · $70 Snapshot session Aug 12, 2026 Last $0.05 Breakeven $70.05 Implied vol 153.1% Delta 0.029 ≈3% ITM Gamma 0.007 Theta -0.048 Vega 0.004 Open interest 366 Model this call Put · $70 In the money Snapshot session May 21, 2026 Last $14.70 Breakeven $55.30 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
1k	3	222.1%	0.072	$0.05		$28.80	—	—	1	0
Call · $75 Snapshot session Aug 13, 2026 Last $0.05 Breakeven $75.05 Implied vol 222.1% Delta 0.072 ≈7% ITM Gamma 0.01 Theta -0.147 Vega 0.008 Open interest 1k Model this call Put · $75 In the money Snapshot session Jul 6, 2026 Last $28.80 Breakeven $46.20 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
114	18	193.6%	0.023	$0.05		—	—	—	—	0
Call · $80 Snapshot session Aug 11, 2026 Last $0.05 Breakeven $80.05 Implied vol 193.6% Delta 0.023 ≈2% ITM Gamma 0.005 Theta -0.052 Vega 0.004 Open interest 114 Model this call Put · $80 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
12	1	288.5%	0.084	$0.46		—	—	—	—	0
Call · $85 Snapshot session Jul 1, 2026 Last $0.46 Breakeven $85.46 Implied vol 288.5% Delta 0.084 ≈8% ITM Gamma 0.009 Theta -0.215 Vega 0.008 Open interest 12 Model this call Put · $85 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
14	1	304.6%	0.077	$0.20		—	—	—	—	0
Call · $90 Snapshot session Jun 29, 2026 Last $0.20 Breakeven $90.20 Implied vol 304.6% Delta 0.077 ≈8% ITM Gamma 0.008 Theta -0.213 Vega 0.009 Open interest 14 Model this call Put · $90 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
8	1	350.9%	0.095	$0.90		—	—	—	—	0
Call · $95 Snapshot session Jun 15, 2026 Last $0.90 Breakeven $95.90 Implied vol 350.9% Delta 0.095 ≈10% ITM Gamma 0.008 Theta -0.29 Vega 0.009 Open interest 8 Model this call Put · $95 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
56	3	323.2%	0.057	$0.10		$51.60	—	—	2	0
Call · $100 Snapshot session Jun 25, 2026 Last $0.10 Breakeven $100.10 Implied vol 323.2% Delta 0.057 ≈6% ITM Gamma 0.006 Theta -0.178 Vega 0.009 Open interest 56 Model this call Put · $100 In the money Snapshot session Aug 12, 2026 Last $51.60 Breakeven $48.40 Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · May 21, 2026–Aug 14, 2026; 6 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. 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.

Key facts CIK 949157 CUSIP 156431108 13F (30d) 386 filings 382 filers Visit website Investor relations