UMC · United Microelectronics Corp

Track UMC — free

$18.34 +0.34 (+1.89%) At close · Aug 21

Market Cap

$46.00B

2.51B

Options Chain

Underlying $18.34 · at close Aug 21, 2026 Options Calculator

Positioning

Sep 18, 2026 · 25 days to expiry · 42 contracts · mixed snapshot sessions · Jul 30, 2026–Aug 21, 2026; 8 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

Sep 18 25d Oct 16 53d Jan 15 144d Apr 16 235d Jan 21 515d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	—	—	—		$0.10	-0.039	110.5%	20	1.3k
Call · $12 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $12 Snapshot session Aug 11, 2026 Last $0.10 Breakeven $11.90 Implied vol 110.5% Delta -0.039 ≈4% ITM Gamma 0.015 Theta -0.009 Vega 0.004 Open interest 1.3k Model this put
0	—	—	—	—		$0.42	-0.045	94.9%	3	350
Call · $13 In the money Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this call Put · $13 Snapshot session Aug 3, 2026 Last $0.42 Breakeven $12.58 Implied vol 94.9% Delta -0.045 ≈5% ITM Gamma 0.02 Theta -0.009 Vega 0.004 Open interest 350 Model this put
292	292	—	—	$5.50		$0.10	-0.044	74.8%	2	58
Call · $14 In the money Snapshot session Aug 6, 2026 Last $5.50 Breakeven $19.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 292 Model this call Put · $14 Snapshot session Aug 14, 2026 Last $0.10 Breakeven $13.90 Implied vol 74.8% Delta -0.044 ≈4% ITM Gamma 0.024 Theta -0.007 Vega 0.004 Open interest 58 Model this put
443	440	—	—	$4.70		$0.23	-0.081	72.1%	1	696
Call · $15 In the money Snapshot session Aug 6, 2026 Last $4.70 Breakeven $19.70 Implied vol — Delta — Gamma — Theta — Vega — Open interest 443 Model this call Put · $15 Snapshot session Aug 20, 2026 Last $0.23 Breakeven $14.77 Implied vol 72.1% Delta -0.081 ≈8% ITM Gamma 0.041 Theta -0.011 Vega 0.008 Open interest 696 Model this put
36	7	—	—	$2.31		$0.35	-0.138	69.7%	18	834
Call · $16 In the money Snapshot session Aug 21, 2026 Last $2.31 Breakeven $18.31 Implied vol — Delta — Gamma — Theta — Vega — Open interest 36 Model this call Put · $16 Snapshot session Aug 20, 2026 Last $0.35 Breakeven $15.65 Implied vol 69.7% Delta -0.138 ≈14% ITM Gamma 0.063 Theta -0.015 Vega 0.012 Open interest 834 Model this put
1.9k	2	—	—	$2.01		$0.51	-0.226	70.9%	17	343
Call · $17 In the money Snapshot session Aug 18, 2026 Last $2.01 Breakeven $19.01 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1.9k Model this call Put · $17 Snapshot session Aug 21, 2026 Last $0.51 Breakeven $16.49 Implied vol 70.9% Delta -0.226 ≈23% ITM Gamma 0.084 Theta -0.021 Vega 0.016 Open interest 343 Model this put
806	93	25.1%	0.845	$1.34		$0.95	-0.33	73%	21	566
Call · $18 In the money Snapshot session Aug 21, 2026 Last $1.34 Breakeven $19.34 Implied vol 25.1% Delta 0.845 ≈84% ITM Gamma 0.186 Theta -0.007 Vega 0.013 Open interest 806 Model this call Put · $18 Snapshot session Aug 21, 2026 Last $0.95 Breakeven $17.05 Implied vol 73% Delta -0.33 ≈33% ITM Gamma 0.099 Theta -0.026 Vega 0.019 Open interest 566 Model this put
Underlying $18.34
344	47	31.3%	0.571	$0.85		$1.50	-0.435	86.2%	6	3.8k
Call · $19 Snapshot session Aug 21, 2026 Last $0.85 Breakeven $19.85 Implied vol 31.3% Delta 0.571 ≈57% ITM Gamma 0.249 Theta -0.013 Vega 0.02 Open interest 344 Model this call Put · $19 In the money Snapshot session Aug 21, 2026 Last $1.50 Breakeven $17.50 Implied vol 86.2% Delta -0.435 ≈43% ITM Gamma 0.091 Theta -0.034 Vega 0.02 Open interest 3.8k Model this put
25.4k	1.2k	43.1%	0.383	$0.58		$2.15	-0.54	74.7%	10	521
Call · $20 Snapshot session Aug 21, 2026 Last $0.58 Breakeven $20.58 Implied vol 43.1% Delta 0.383 ≈38% ITM Gamma 0.178 Theta -0.017 Vega 0.021 Open interest 25.4k Model this call Put · $20 In the money Snapshot session Aug 21, 2026 Last $2.15 Breakeven $17.85 Implied vol 74.7% Delta -0.54 ≈54% ITM Gamma 0.105 Theta -0.029 Vega 0.02 Open interest 521 Model this put
320	10	47.3%	0.257	$0.44		$2.80	-0.615	83.9%	1	499
Call · $21 Snapshot session Aug 21, 2026 Last $0.44 Breakeven $21.44 Implied vol 47.3% Delta 0.257 ≈26% ITM Gamma 0.136 Theta -0.016 Vega 0.018 Open interest 320 Model this call Put · $21 In the money Snapshot session Aug 21, 2026 Last $2.80 Breakeven $18.20 Implied vol 83.9% Delta -0.615 ≈61% ITM Gamma 0.091 Theta -0.032 Vega 0.018 Open interest 499 Model this put
1.4k	34	52.2%	0.181	$0.25		$3.88	-0.646	100.4%	1	36
Call · $22 Snapshot session Aug 21, 2026 Last $0.25 Breakeven $22.25 Implied vol 52.2% Delta 0.181 ≈18% ITM Gamma 0.1 Theta -0.014 Vega 0.014 Open interest 1.4k Model this call Put · $22 In the money Snapshot session Aug 19, 2026 Last $3.88 Breakeven $18.12 Implied vol 100.4% Delta -0.646 ≈65% ITM Gamma 0.074 Theta -0.037 Vega 0.019 Open interest 36 Model this put
25.5k	96	53.8%	0.117	$0.18		$4.40	-0.66	118.7%	1	85
Call · $23 Snapshot session Aug 21, 2026 Last $0.18 Breakeven $23.18 Implied vol 53.8% Delta 0.117 ≈12% ITM Gamma 0.072 Theta -0.011 Vega 0.01 Open interest 25.5k Model this call Put · $23 In the money Snapshot session Aug 14, 2026 Last $4.40 Breakeven $18.60 Implied vol 118.7% Delta -0.66 ≈66% ITM Gamma 0.061 Theta -0.043 Vega 0.019 Open interest 85 Model this put
181	2	57.7%	0.079	$0.10		$5.95	-0.674	133.8%	1	3
Call · $24 Snapshot session Aug 21, 2026 Last $0.10 Breakeven $24.10 Implied vol 57.7% Delta 0.079 ≈8% ITM Gamma 0.051 Theta -0.009 Vega 0.01 Open interest 181 Model this call Put · $24 In the money Snapshot session Jul 30, 2026 Last $5.95 Breakeven $18.05 Implied vol 133.8% Delta -0.674 ≈67% ITM Gamma 0.053 Theta -0.047 Vega 0.019 Open interest 3 Model this put
319	2	64.8%	0.072	$0.10		$5.85	-0.729	128.7%	1	19
Call · $25 Snapshot session Aug 21, 2026 Last $0.10 Breakeven $25.10 Implied vol 64.8% Delta 0.072 ≈7% ITM Gamma 0.042 Theta -0.009 Vega 0.006 Open interest 319 Model this call Put · $25 In the money Snapshot session Aug 13, 2026 Last $5.85 Breakeven $19.15 Implied vol 128.7% Delta -0.729 ≈73% ITM Gamma 0.052 Theta -0.042 Vega 0.015 Open interest 19 Model this put
65	1	67.6%	0.054	$0.05		—	-0.708	154.1%	—	0
Call · $26 Snapshot session Aug 20, 2026 Last $0.05 Breakeven $26.05 Implied vol 67.6% Delta 0.054 ≈5% ITM Gamma 0.032 Theta -0.007 Vega 0.006 Open interest 65 Model this call Put · $26 In the money Snapshot session Unknown Last — Breakeven — Implied vol 154.1% Delta -0.708 ≈71% ITM Gamma 0.045 Theta -0.052 Vega 0.015 Open interest 0 Model this put
98	4	89.5%	0.09	$0.15		—	-0.738	153.1%	—	0
Call · $27 Snapshot session Aug 17, 2026 Last $0.15 Breakeven $27.15 Implied vol 89.5% Delta 0.09 ≈9% ITM Gamma 0.036 Theta -0.015 Vega 0.011 Open interest 98 Model this call Put · $27 In the money Snapshot session Unknown Last — Breakeven — Implied vol 153.1% Delta -0.738 ≈74% ITM Gamma 0.042 Theta -0.049 Vega 0.016 Open interest 0 Model this put
27	5	99.3%	0.093	$0.05		$9.79	-0.674	200.9%	2	0
Call · $28 Snapshot session Aug 20, 2026 Last $0.05 Breakeven $28.05 Implied vol 99.3% Delta 0.093 ≈9% ITM Gamma 0.033 Theta -0.017 Vega 0.011 Open interest 27 Model this call Put · $28 In the money Snapshot session Aug 19, 2026 Last $9.79 Breakeven $18.21 Implied vol 200.9% Delta -0.674 ≈67% ITM Gamma 0.036 Theta -0.072 Vega 0.02 Open interest 0 Model this put
22	21	94.7%	0.064	$0.10		—	-0.713	191.4%	—	0
Call · $29 Snapshot session Aug 13, 2026 Last $0.10 Breakeven $29.10 Implied vol 94.7% Delta 0.064 ≈6% ITM Gamma 0.026 Theta -0.012 Vega 0.006 Open interest 22 Model this call Put · $29 In the money Snapshot session Unknown Last — Breakeven — Implied vol 191.4% Delta -0.713 ≈71% ITM Gamma 0.035 Theta -0.064 Vega 0.016 Open interest 0 Model this put
73	1	96.8%	0.052	$0.10		—	-0.714	202.1%	—	0
Call · $30 Snapshot session Aug 13, 2026 Last $0.10 Breakeven $30.10 Implied vol 96.8% Delta 0.052 ≈5% ITM Gamma 0.022 Theta -0.01 Vega 0.006 Open interest 73 Model this call Put · $30 In the money Snapshot session Unknown Last — Breakeven — Implied vol 202.1% Delta -0.714 ≈71% ITM Gamma 0.033 Theta -0.067 Vega 0.016 Open interest 0 Model this put
47	2	121.6%	0.088	$0.03		—	-0.72	209.4%	—	0
Call · $31 Snapshot session Aug 21, 2026 Last $0.03 Breakeven $31.03 Implied vol 121.6% Delta 0.088 ≈9% ITM Gamma 0.026 Theta -0.02 Vega 0.007 Open interest 47 Model this call Put · $31 In the money Snapshot session Unknown Last — Breakeven — Implied vol 209.4% Delta -0.72 ≈72% ITM Gamma 0.032 Theta -0.069 Vega 0.016 Open interest 0 Model this put
21	3	123.1%	0.079	$0.05		—	-0.721	219.5%	—	0
Call · $32 Snapshot session Aug 19, 2026 Last $0.05 Breakeven $32.05 Implied vol 123.1% Delta 0.079 ≈8% ITM Gamma 0.024 Theta -0.018 Vega 0.007 Open interest 21 Model this call Put · $32 In the money Snapshot session Unknown Last — Breakeven — Implied vol 219.5% Delta -0.721 ≈72% ITM Gamma 0.03 Theta -0.072 Vega 0.017 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 · Jul 30, 2026–Aug 21, 2026; 8 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 1033767 CUSIP 910873405 13F (30d) 320 filings 294 filers Visit website Investor relations