Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1226
Avery Dennison
AVY
$12.3B
| $201K | 0.01% |
1,900
-2,077
| -52% | -$241K |
|
|
TDAY
1227
USA Today Co
TDAY
$1.23B
| $201K | 0.01% |
+11,784
| New | +$197K |
|
1228
CALL
Southwest Airlines
LUV
$22.1B
| $201K | 0.01% |
3,269
+53
| +2% | +$3.18K |
|
1229
CALL
Take-Two Interactive
TTWO
$43B
| $201K | 0.01% |
500
+286
| +134% | +$32K |
|
|
JOYY
1230
CALL
JOYY Inc
JOYY
$3.73B
| $201K | 0.01% |
386
-55
| -12% | -$6.93K |
|
|
ALXN
1231
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $201K | 0.01% |
1,122
+389
| +53% | +$46.5K |
|
|
VSI
1232
DELISTED
Vitamin Shoppe Inc.
VSI
| $201K | 0.01% |
46,402
+44,363
| +2,176% | +$193K |
|
|
CZR
1233
PUT
DELISTED
Caesars Entertainment Corporation
CZR
| $201K | 0.01% |
1,435
-571
| -28% | -$7.33K |
|
1234
CALL
Cracker Barrel
CBRL
$1.2B
| $200K | 0.01% |
+280
| New | +$46.4K |
|
1235
Teucrium Corn Fund
CORN
$190M
| $200K | 0.01% |
11,178
+6,990
| +167% | +$121K |
|
1236
PUT
Howmet Aerospace
HWM
$116B
| $200K | 0.01% |
1,149
+831
| +261% | +$16.9K |
|
1237
CALL
TAL Education Group
TAL
$5.71B
| $200K | 0.01% |
584
+526
| +907% | +$18.1K |
|
1238
PUT
Macy's
M
$6.15B
| $199K | 0.01% |
1,884
-766
| -29% | -$20.7K |
|
1239
PUT
Intellia Therapeutics
NTLA
$1.5B
| $199K | 0.01% |
246
-26
| -10% | -$639 |
|
1240
CALL
ON Semiconductor
ON
$33.8B
| $199K | 0.01% |
778
-292
| -27% | -$7.04K |
|
1241
CALL
Ferrari
RACE
$63.3B
| $199K | 0.01% |
212
-8
| -4% | -$970 |
|
1242
CALL
Cigna
CI
$76.6B
| $198K | 0.01% |
576
+475
| +470% | +$92.3K |
|
1243
PUT
Cirrus Logic
CRUS
$6.74B
| $197K | 0.01% |
155
-128
| -45% | -$5.94K |
|
1244
Icon
ICLR
$12.8B
| $197K | 0.01% |
+1,672
| New | +$192K |
|
1245
PUT
Box
BOX
$4.02B
| $196K | 0.01% |
778
+427
| +122% | +$9.19K |
|
1246
Century Aluminum
CENX
$4.57B
| $196K | 0.01% |
11,893
-45,508
| -79% | -$951K |
|
1247
iShares US Oil & Gas Exploration & Production ETF
IEO
$573M
| $196K | 0.01% |
+3,091
| New | +$198K |
|
1248
Natural Health Trends
NHTC
$15.4M
| $196K | 0.01% |
+10,356
| New | +$176K |
|
1249
Telecom Argentina
TEO
$5.89B
| $196K | 0.01% |
+6,283
| New | +$221K |
|
|
AJRD
1250
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $196K | 0.01% |
+7,039
| New | +$198K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.