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 | |
|---|---|---|---|---|---|---|
|
CONN
1301
CALL
DELISTED
Conn's Inc.
CONN
| $184K | 0.01% |
311
+26
| +9% | +$866 |
|
|
PVG
1302
DELISTED
PRETIUM RESOURCES INC.
PVG
| $184K | 0.01% |
27,647
+23,509
| +568% | +$185K |
|
|
SWN
1303
DELISTED
Southwestern Energy Company
SWN
| $183K | 0.01% |
42,480
+13,380
| +46% | +$60.1K |
|
|
DBD
1304
DELISTED
Diebold Nixdorf Incorporated
DBD
| $183K | 0.01% |
11,945
+6,343
| +113% | +$106K |
|
|
VIAB
1305
CALL
DELISTED
Viacom Inc. Class B
VIAB
| $183K | 0.01% |
1,580
+527
| +50% | +$17K |
|
1306
Labcorp
LH
$24.3B
| $182K | 0.01% |
+1,312
| New | +$193K |
|
1307
Vermilion Energy
VET
$1.73B
| $182K | 0.01% |
5,654
+4,004
| +243% | +$139K |
|
1308
PUT
Waste Management
WM
$95.9B
| $182K | 0.01% |
452
+389
| +617% | +$33.4K |
|
1309
PUT
CSX Corp
CSX
$98.6B
| $181K | 0.01% |
5,979
-3,285
| -35% | -$61.4K |
|
1310
PUT
Freeport-McMoran
FCX
$90B
| $181K | 0.01% |
1,609
-3,203
| -67% | -$60.1K |
|
1311
PUT
Thor Industries
THO
$3.99B
| $181K | 0.01% |
312
+245
| +366% | +$32.7K |
|
|
UPL
1312
DELISTED
Ultra Petroleum Corp. Common Stock
UPL
| $181K | 0.01% |
43,439
+28,823
| +197% | +$169K |
|
1313
PUT
Barclays
BCS
$94.1B
| $180K | 0.01% |
817
-216
| -21% | -$2.35K |
|
1314
Calumet Specialty Products
CLMT
$3.63B
| $180K | 0.01% |
25,665
+7,073
| +38% | +$52.3K |
|
|
SREV
1315
DELISTED
ServiceSource International, Inc.
SREV
| $180K | 0.01% |
47,498
-7,573
| -14% | -$27.1K |
|
|
GRN
1316
PUT
DELISTED
iPath Global Carbon ETN
GRN
| $180K | 0.01% |
1,669
+1,410
| +544% | +$18K |
|
1317
CALL
Wolfspeed
WOLF
$1.2B
| $179K | 0.01% |
284
-264
| -48% | -$9.95K |
|
|
CCMP
1318
CALL
DELISTED
CMC Materials, Inc. Common Stock
CCMP
| $179K | 0.01% |
+70
| New | +$7.22K |
|
1319
Mercado Libre
MELI
$91.3B
| $178K | 0.01% |
500
-5,323
| -91% | -$1.95M |
|
1320
Ryman Hospitality Properties
RHP
$8.4B
| $178K | 0.01% |
2,299
+1,756
| +323% | +$128K |
|
1321
Strategic Education
STRA
$1.71B
| $177K | 0.01% |
1,760
+1,007
| +134% | +$95.3K |
|
1322
PUT
BlackBerry
BB
$5.01B
| $176K | 0.01% |
1,388
+481
| +53% | +$6.12K |
|
1323
Caesarstone
CSTE
$72.3M
| $176K | 0.01% |
+8,993
| New | +$194K |
|
1324
Gentex
GNTX
$4.88B
| $176K | 0.01% |
+7,666
| New | +$174K |
|
1325
Huntington Bancshares
HBAN
$35.1B
| $176K | 0.01% |
11,688
-1,838
| -14% | -$28.9K |
|
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.