SIMO · Silicon Motion Technology CORP

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$249.64 -21.36 (-7.88%)

Market Cap

$9.19B

33.91M

Options Chain

15-min delayed Underlying $249.64 · today Options Calculator

Positioning

Aug 21, 2026 · 25 days to expiry · 92 contracts

Put / call OI

1.25

Balanced positioning

Open interest

14,734

contracts outstanding

Volume

3,674

traded today

Max pain

$300.00

$50.36 above spot

ATM implied vol

133.2%

market's expected move

Open interest by strike · near the money

Calls Puts

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Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 25d Sep 18 53d Dec 18 144d Mar 19 235d Dec 17 508d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
0	—	156.1%	0.958	—		$2.46	-0.035	146.3%	2.6k	2.6k
Call · $135 In the money Last — Breakeven — Implied vol 156.1% Delta 0.958 ≈96% ITM Gamma 0.001 Theta -0.188 Vega 0.048 Open interest 0 Model this call Put · $135 Last $2.46 Breakeven $132.54 Implied vol 146.3% Delta -0.035 ≈3% ITM Gamma 0.001 Theta -0.147 Vega 0.048 Open interest 2.6k Model this put
0	—	152.1%	0.954	—		$1.74	-0.057	163.7%	1	29
Call · $140 In the money Last — Breakeven — Implied vol 152.1% Delta 0.954 ≈95% ITM Gamma 0.001 Theta -0.2 Vega 0.085 Open interest 0 Model this call Put · $140 Last $1.74 Breakeven $138.26 Implied vol 163.7% Delta -0.057 ≈6% ITM Gamma 0.001 Theta -0.245 Vega 0.085 Open interest 29 Model this put
0	—	231.5%	0.886	—		—	-0.077	176.7%	—	0
Call · $145 In the money Last — Breakeven — Implied vol 231.5% Delta 0.886 ≈89% ITM Gamma 0.001 Theta -0.589 Vega 0.126 Open interest 0 Model this call Put · $145 Last — Breakeven — Implied vol 176.7% Delta -0.077 ≈8% ITM Gamma 0.001 Theta -0.337 Vega 0.086 Open interest 0 Model this put
1	1	145.7%	0.938	$124.62		$2.50	-0.048	133.9%	144	205
Call · $150 In the money Last $124.62 Breakeven $274.62 Implied vol 145.7% Delta 0.938 ≈94% ITM Gamma 0.001 Theta -0.238 Vega 0.088 Open interest 1 Model this call Put · $150 Last $2.50 Breakeven $147.50 Implied vol 133.9% Delta -0.048 ≈5% ITM Gamma 0.001 Theta -0.176 Vega 0.088 Open interest 205 Model this put
0	—	212.9%	0.873	—		$3.30	-0.08	153%	21	24
Call · $155 In the money Last — Breakeven — Implied vol 212.9% Delta 0.873 ≈87% ITM Gamma 0.001 Theta -0.587 Vega 0.132 Open interest 0 Model this call Put · $155 Last $3.30 Breakeven $151.70 Implied vol 153% Delta -0.08 ≈8% ITM Gamma 0.001 Theta -0.297 Vega 0.089 Open interest 24 Model this put
0	—	145.2%	0.916	—		$3.90	-0.09	152.7%	5	50
Call · $160 In the money Last — Breakeven — Implied vol 145.2% Delta 0.916 ≈92% ITM Gamma 0.002 Theta -0.302 Vega 0.091 Open interest 0 Model this call Put · $160 Last $3.90 Breakeven $156.10 Implied vol 152.7% Delta -0.09 ≈9% ITM Gamma 0.002 Theta -0.329 Vega 0.091 Open interest 50 Model this put
0	—	141.9%	0.907	—		—	-0.091	140.6%	—	0
Call · $165 In the money Last — Breakeven — Implied vol 141.9% Delta 0.907 ≈91% ITM Gamma 0.002 Theta -0.32 Vega 0.092 Open interest 0 Model this call Put · $165 Last — Breakeven — Implied vol 140.6% Delta -0.091 ≈9% ITM Gamma 0.002 Theta -0.304 Vega 0.092 Open interest 0 Model this put
29	14	141.5%	0.893	$111.90		$4.25	-0.099	136%	18	78
Call · $170 In the money Last $111.90 Breakeven $281.90 Implied vol 141.5% Delta 0.893 ≈89% ITM Gamma 0.002 Theta -0.351 Vega 0.141 Open interest 29 Model this call Put · $170 Last $4.25 Breakeven $165.75 Implied vol 136% Delta -0.099 ≈10% ITM Gamma 0.002 Theta -0.314 Vega 0.141 Open interest 78 Model this put
3	8	135.3%	0.884	$108.30		$4.50	-0.115	135.3%	12	26
Call · $175 In the money Last $108.30 Breakeven $283.30 Implied vol 135.3% Delta 0.884 ≈88% ITM Gamma 0.002 Theta -0.354 Vega 0.143 Open interest 3 Model this call Put · $175 Last $4.50 Breakeven $170.50 Implied vol 135.3% Delta -0.115 ≈12% ITM Gamma 0.002 Theta -0.344 Vega 0.143 Open interest 26 Model this put
25	1	133.2%	0.87	$86.80		$5.70	-0.123	128.4%	31	38
Call · $180 In the money Last $86.80 Breakeven $266.80 Implied vol 133.2% Delta 0.87 ≈87% ITM Gamma 0.002 Theta -0.377 Vega 0.145 Open interest 25 Model this call Put · $180 Last $5.70 Breakeven $174.30 Implied vol 128.4% Delta -0.123 ≈12% ITM Gamma 0.002 Theta -0.341 Vega 0.145 Open interest 38 Model this put
0	—	136.2%	0.849	—		$6.20	-0.143	130.3%	101	108
Call · $185 In the money Last — Breakeven — Implied vol 136.2% Delta 0.849 ≈85% ITM Gamma 0.003 Theta -0.426 Vega 0.147 Open interest 0 Model this call Put · $185 Last $6.20 Breakeven $178.80 Implied vol 130.3% Delta -0.143 ≈14% ITM Gamma 0.003 Theta -0.384 Vega 0.147 Open interest 108 Model this put
25	2	138.5%	0.83	$95.20		$9.11	-0.158	128.3%	1	76
Call · $190 In the money Last $95.20 Breakeven $285.20 Implied vol 138.5% Delta 0.83 ≈83% ITM Gamma 0.003 Theta -0.473 Vega 0.149 Open interest 25 Model this call Put · $190 Last $9.11 Breakeven $180.89 Implied vol 128.3% Delta -0.158 ≈16% ITM Gamma 0.003 Theta -0.406 Vega 0.149 Open interest 76 Model this put
2	2	137.9%	0.812	$91.70		$7.20	-0.18	132.1%	1	88
Call · $195 In the money Last $91.70 Breakeven $286.70 Implied vol 137.9% Delta 0.812 ≈81% ITM Gamma 0.003 Theta -0.501 Vega 0.198 Open interest 2 Model this call Put · $195 Last $7.20 Breakeven $187.80 Implied vol 132.1% Delta -0.18 ≈18% ITM Gamma 0.003 Theta -0.46 Vega 0.198 Open interest 88 Model this put
4	2	176.1%	0.766	$83.00		$8.20	-0.198	128.5%	3	80
Call · $200 In the money Last $83.00 Breakeven $283.00 Implied vol 176.1% Delta 0.766 ≈77% ITM Gamma 0.003 Theta -0.718 Vega 0.198 Open interest 4 Model this call Put · $200 Last $8.20 Breakeven $191.80 Implied vol 128.5% Delta -0.198 ≈20% ITM Gamma 0.003 Theta -0.469 Vega 0.201 Open interest 80 Model this put
2	2	134.4%	0.753	$79.70		$11.00	-0.234	120.5%	15	54
Call · $210 In the money Last $79.70 Breakeven $289.70 Implied vol 134.4% Delta 0.753 ≈75% ITM Gamma 0.004 Theta -0.566 Vega 0.205 Open interest 2 Model this call Put · $210 Last $11.00 Breakeven $199.00 Implied vol 120.5% Delta -0.234 ≈23% ITM Gamma 0.004 Theta -0.48 Vega 0.206 Open interest 54 Model this put
6	5	134.2%	0.711	$63.10		$13.01	-0.285	128.7%	2	32
Call · $220 In the money Last $63.10 Breakeven $283.10 Implied vol 134.2% Delta 0.711 ≈71% ITM Gamma 0.004 Theta -0.619 Vega 0.211 Open interest 6 Model this call Put · $220 Last $13.01 Breakeven $206.99 Implied vol 128.7% Delta -0.285 ≈29% ITM Gamma 0.004 Theta -0.576 Vega 0.211 Open interest 32 Model this put
21	1	133.8%	0.667	$51.01		$15.80	-0.327	115.6%	1	113
Call · $230 In the money Last $51.01 Breakeven $281.01 Implied vol 133.8% Delta 0.667 ≈67% ITM Gamma 0.004 Theta -0.648 Vega 0.246 Open interest 21 Model this call Put · $230 Last $15.80 Breakeven $214.20 Implied vol 115.6% Delta -0.327 ≈33% ITM Gamma 0.005 Theta -0.545 Vega 0.247 Open interest 113 Model this put
167	91	130.1%	0.621	$69.40		$26.55	-0.379	129.1%	57	81
Call · $240 In the money Last $69.40 Breakeven $309.40 Implied vol 130.1% Delta 0.621 ≈62% ITM Gamma 0.004 Theta -0.659 Vega 0.252 Open interest 167 Model this call Put · $240 Last $26.55 Breakeven $213.45 Implied vol 129.1% Delta -0.379 ≈38% ITM Gamma 0.004 Theta -0.638 Vega 0.252 Open interest 81 Model this put
Underlying $249.64
135	1	134.6%	0.576	$49.00		$32.04	-0.425	131.9%	1	262
Call · $250 Last $49.00 Breakeven $299.00 Implied vol 134.6% Delta 0.576 ≈58% ITM Gamma 0.004 Theta -0.71 Vega 0.257 Open interest 135 Model this call Put · $250 In the money Last $32.04 Breakeven $217.96 Implied vol 131.9% Delta -0.425 ≈42% ITM Gamma 0.005 Theta -0.68 Vega 0.257 Open interest 262 Model this put
564	2	133.8%	0.533	$57.68		$30.01	-0.471	128.6%	1	170
Call · $260 Last $57.68 Breakeven $317.68 Implied vol 133.8% Delta 0.533 ≈53% ITM Gamma 0.005 Theta -0.709 Vega 0.262 Open interest 564 Model this call Put · $260 In the money Last $30.01 Breakeven $229.99 Implied vol 128.6% Delta -0.471 ≈47% ITM Gamma 0.005 Theta -0.664 Vega 0.263 Open interest 170 Model this put
669	1	133.7%	0.491	$35.08		$34.44	-0.514	129.7%	3	64
Call · $270 Last $35.08 Breakeven $305.08 Implied vol 133.7% Delta 0.491 ≈49% ITM Gamma 0.005 Theta -0.707 Vega 0.267 Open interest 669 Model this call Put · $270 In the money Last $34.44 Breakeven $235.56 Implied vol 129.7% Delta -0.514 ≈51% ITM Gamma 0.005 Theta -0.668 Vega 0.268 Open interest 64 Model this put
902	2	133%	0.447	$32.47		$50.08	-0.58	116.7%	59	813
Call · $280 Last $32.47 Breakeven $312.47 Implied vol 133% Delta 0.447 ≈45% ITM Gamma 0.005 Theta -0.702 Vega 0.272 Open interest 902 Model this call Put · $280 In the money Last $50.08 Breakeven $229.92 Implied vol 116.7% Delta -0.58 ≈58% ITM Gamma 0.005 Theta -0.595 Vega 0.272 Open interest 813 Model this put
505	2	135.6%	0.412	$25.00		$41.20	-0.603	127%	23	145
Call · $290 Last $25.00 Breakeven $315.00 Implied vol 135.6% Delta 0.412 ≈41% ITM Gamma 0.004 Theta -0.706 Vega 0.243 Open interest 505 Model this call Put · $290 In the money Last $41.20 Breakeven $248.80 Implied vol 127% Delta -0.603 ≈60% ITM Gamma 0.005 Theta -0.634 Vega 0.243 Open interest 145 Model this put
1.4k	1	136.4%	0.379	$22.35		$58.54	-0.709	99.3%	3	67
Call · $300 Last $22.35 Breakeven $322.35 Implied vol 136.4% Delta 0.379 ≈38% ITM Gamma 0.004 Theta -0.688 Vega 0.247 Open interest 1.4k Model this call Put · $300 In the money Last $58.54 Breakeven $241.46 Implied vol 99.3% Delta -0.709 ≈71% ITM Gamma 0.005 Theta -0.435 Vega 0.248 Open interest 67 Model this put
184	2	132.2%	0.335	$22.15		$58.50	-0.67	130.2%	1	46
Call · $310 Last $22.15 Breakeven $332.15 Implied vol 132.2% Delta 0.335 ≈34% ITM Gamma 0.004 Theta -0.637 Vega 0.251 Open interest 184 Model this call Put · $310 In the money Last $58.50 Breakeven $251.50 Implied vol 130.2% Delta -0.67 ≈67% ITM Gamma 0.004 Theta -0.603 Vega 0.251 Open interest 46 Model this put
92	1	135.5%	0.308	$15.70		$75.40	-0.714	127.3%	6	47
Call · $320 Last $15.70 Breakeven $335.70 Implied vol 135.5% Delta 0.308 ≈31% ITM Gamma 0.004 Theta -0.635 Vega 0.255 Open interest 92 Model this call Put · $320 In the money Last $75.40 Breakeven $244.60 Implied vol 127.3% Delta -0.714 ≈71% ITM Gamma 0.004 Theta -0.56 Vega 0.252 Open interest 47 Model this put
242	1	135.3%	0.277	$19.30		$53.90	-0.737	129%	11	108
Call · $330 Last $19.30 Breakeven $349.30 Implied vol 135.3% Delta 0.277 ≈28% ITM Gamma 0.004 Theta -0.606 Vega 0.198 Open interest 242 Model this call Put · $330 In the money Last $53.90 Breakeven $276.10 Implied vol 129% Delta -0.737 ≈74% ITM Gamma 0.004 Theta -0.538 Vega 0.198 Open interest 108 Model this put
181	8	138.2%	0.259	$15.44		$80.12	-0.763	129.1%	20	1.3k
Call · $340 Last $15.44 Breakeven $355.44 Implied vol 138.2% Delta 0.259 ≈26% ITM Gamma 0.004 Theta -0.593 Vega 0.201 Open interest 181 Model this call Put · $340 In the money Last $80.12 Breakeven $259.88 Implied vol 129.1% Delta -0.763 ≈76% ITM Gamma 0.004 Theta -0.504 Vega 0.201 Open interest 1.3k Model this put
131	7	135.6%	0.229	$14.20		$87.12	-0.782	131.9%	20	1.3k
Call · $350 Last $14.20 Breakeven $364.20 Implied vol 135.6% Delta 0.229 ≈23% ITM Gamma 0.003 Theta -0.541 Vega 0.204 Open interest 131 Model this call Put · $350 In the money Last $87.12 Breakeven $262.88 Implied vol 131.9% Delta -0.782 ≈78% ITM Gamma 0.003 Theta -0.489 Vega 0.204 Open interest 1.3k Model this put
80	6	144.5%	0.227	$9.00		$98.20	-0.814	129.9%	4	55
Call · $360 Last $9.00 Breakeven $369.00 Implied vol 144.5% Delta 0.227 ≈23% ITM Gamma 0.003 Theta -0.573 Vega 0.207 Open interest 80 Model this call Put · $360 In the money Last $98.20 Breakeven $261.80 Implied vol 129.9% Delta -0.814 ≈81% ITM Gamma 0.003 Theta -0.44 Vega 0.205 Open interest 55 Model this put
152	5	141.9%	0.197	$12.00		$106.20	-0.817	137.6%	2	7
Call · $370 Last $12.00 Breakeven $382.00 Implied vol 141.9% Delta 0.197 ≈20% ITM Gamma 0.003 Theta -0.521 Vega 0.21 Open interest 152 Model this call Put · $370 In the money Last $106.20 Breakeven $263.80 Implied vol 137.6% Delta -0.817 ≈82% ITM Gamma 0.003 Theta -0.463 Vega 0.207 Open interest 7 Model this put
72	2	141.6%	0.174	$8.85		$111.30	—	—	2	41
Call · $380 Last $8.85 Breakeven $388.85 Implied vol 141.6% Delta 0.174 ≈17% ITM Gamma 0.003 Theta -0.486 Vega 0.142 Open interest 72 Model this call Put · $380 In the money Last $111.30 Breakeven $268.70 Implied vol — Delta — Gamma — Theta — Vega — Open interest 41 Model this put
69	2	142.4%	0.161	$8.50		$123.70	-0.867	130.5%	22	12
Call · $390 Last $8.50 Breakeven $398.50 Implied vol 142.4% Delta 0.161 ≈16% ITM Gamma 0.003 Theta -0.461 Vega 0.144 Open interest 69 Model this call Put · $390 In the money Last $123.70 Breakeven $266.30 Implied vol 130.5% Delta -0.867 ≈87% ITM Gamma 0.003 Theta -0.345 Vega 0.143 Open interest 12 Model this put
135	101	137.7%	0.136	$4.45		$133.70	-0.889	128.7%	2	24
Call · $400 Last $4.45 Breakeven $404.45 Implied vol 137.7% Delta 0.136 ≈14% ITM Gamma 0.002 Theta -0.395 Vega 0.146 Open interest 135 Model this call Put · $400 In the money Last $133.70 Breakeven $266.30 Implied vol 128.7% Delta -0.889 ≈89% ITM Gamma 0.002 Theta -0.299 Vega 0.143 Open interest 24 Model this put
15	1	139.5%	0.125	$10.90		$140.50	-0.912	125.7%	2	2
Call · $410 Last $10.90 Breakeven $420.90 Implied vol 139.5% Delta 0.125 ≈13% ITM Gamma 0.002 Theta -0.378 Vega 0.148 Open interest 15 Model this call Put · $410 In the money Last $140.50 Breakeven $269.50 Implied vol 125.7% Delta -0.912 ≈91% ITM Gamma 0.002 Theta -0.245 Vega 0.084 Open interest 2 Model this put
121	2	142%	0.117	$5.40		$118.65	-0.902	135.6%	1	1
Call · $420 Last $5.40 Breakeven $425.40 Implied vol 142% Delta 0.117 ≈12% ITM Gamma 0.002 Theta -0.366 Vega 0.149 Open interest 121 Model this call Put · $420 In the money Last $118.65 Breakeven $301.35 Implied vol 135.6% Delta -0.902 ≈90% ITM Gamma 0.002 Theta -0.287 Vega 0.143 Open interest 1 Model this put
68	53	142.1%	0.102	$13.10		$126.40	-0.916	133.9%	1	1
Call · $430 Last $13.10 Breakeven $443.10 Implied vol 142.1% Delta 0.102 ≈10% ITM Gamma 0.002 Theta -0.336 Vega 0.151 Open interest 68 Model this call Put · $430 In the money Last $126.40 Breakeven $303.60 Implied vol 133.9% Delta -0.916 ≈92% ITM Gamma 0.002 Theta -0.25 Vega 0.086 Open interest 1 Model this put
188	3	143.7%	0.094	$5.03		$170.40	—	—	2	1
Call · $440 Last $5.03 Breakeven $445.03 Implied vol 143.7% Delta 0.094 ≈9% ITM Gamma 0.002 Theta -0.321 Vega 0.088 Open interest 188 Model this call Put · $440 In the money Last $170.40 Breakeven $269.60 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
33	1	145.7%	0.09	$4.37		—	-0.933	134.3%	—	0
Call · $450 Last $4.37 Breakeven $454.37 Implied vol 145.7% Delta 0.09 ≈9% ITM Gamma 0.002 Theta -0.312 Vega 0.089 Open interest 33 Model this call Put · $450 In the money Last — Breakeven — Implied vol 134.3% Delta -0.933 ≈93% ITM Gamma 0.002 Theta -0.206 Vega 0.086 Open interest 0 Model this put
130	124	139.4%	0.071	$2.90		—	-0.947	131.8%	—	0
Call · $460 Last $2.90 Breakeven $462.90 Implied vol 139.4% Delta 0.071 ≈7% ITM Gamma 0.001 Theta -0.248 Vega 0.091 Open interest 130 Model this call Put · $460 In the money Last — Breakeven — Implied vol 131.8% Delta -0.947 ≈95% ITM Gamma 0.001 Theta -0.166 Vega 0.084 Open interest 0 Model this put
25	1	148.5%	0.079	$3.00		—	-0.948	135.6%	—	0
Call · $470 Last $3.00 Breakeven $473.00 Implied vol 148.5% Delta 0.079 ≈8% ITM Gamma 0.002 Theta -0.288 Vega 0.091 Open interest 25 Model this call Put · $470 In the money Last — Breakeven — Implied vol 135.6% Delta -0.948 ≈95% ITM Gamma 0.001 Theta -0.168 Vega 0.085 Open interest 0 Model this put
9	1	150.7%	0.076	$4.00		—	-0.959	134.5%	—	0
Call · $480 Last $4.00 Breakeven $484.00 Implied vol 150.7% Delta 0.076 ≈8% ITM Gamma 0.001 Theta -0.281 Vega 0.092 Open interest 9 Model this call Put · $480 In the money Last — Breakeven — Implied vol 134.5% Delta -0.959 ≈96% ITM Gamma 0.001 Theta -0.137 Vega 0.044 Open interest 0 Model this put
65	47	152.6%	0.072	$4.00		$220.50	-0.96	137.6%	2	0
Call · $490 Last $4.00 Breakeven $494.00 Implied vol 152.6% Delta 0.072 ≈7% ITM Gamma 0.001 Theta -0.272 Vega 0.093 Open interest 65 Model this call Put · $490 In the money Last $220.50 Breakeven $269.50 Implied vol 137.6% Delta -0.96 ≈96% ITM Gamma 0.001 Theta -0.138 Vega 0.043 Open interest 0 Model this put
27	5	154.9%	0.069	$10.00		—	-0.971	131.5%	—	0
Call · $500 Last $10.00 Breakeven $510.00 Implied vol 154.9% Delta 0.069 ≈7% ITM Gamma 0.001 Theta -0.267 Vega 0.094 Open interest 27 Model this call Put · $500 In the money Last — Breakeven — Implied vol 131.5% Delta -0.971 ≈97% ITM Gamma 0.001 Theta -0.095 Vega 0.042 Open interest 0 Model this put
11	10	157.2%	0.066	$3.20		—	-0.97	135.8%	—	0
Call · $510 Last $3.20 Breakeven $513.20 Implied vol 157.2% Delta 0.066 ≈7% ITM Gamma 0.001 Theta -0.262 Vega 0.095 Open interest 11 Model this call Put · $510 In the money Last — Breakeven — Implied vol 135.8% Delta -0.97 ≈97% ITM Gamma 0.001 Theta -0.101 Vega 0.042 Open interest 0 Model this put
17	1	151.9%	0.049	$2.66		—	-0.972	137.7%	—	0
Call · $520 Last $2.66 Breakeven $522.66 Implied vol 151.9% Delta 0.049 ≈5% ITM Gamma 0.001 Theta -0.204 Vega 0.096 Open interest 17 Model this call Put · $520 In the money Last — Breakeven — Implied vol 137.7% Delta -0.972 ≈97% ITM Gamma 0.001 Theta -0.096 Vega 0.042 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. The 25 strikes around the money are shown by default — switch to "All 46" for the wings. Max pain is the listed strike where the most open interest would expire worthless — a positioning reference, not a forecast.

Key facts CIK 1329394 CUSIP 82706C108 13F (30d) 72 filings 71 filers Visit website Investor relations