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 | |
|---|---|---|---|---|---|---|
1026
CALL
Medtronic
MDT
$107B
| $280K | 0.01% |
1,440
-335
| -19% | -$27.6K |
|
1027
Pitney Bowes
PBI
$2.42B
| $280K | 0.01% |
25,800
+15,588
| +153% | +$193K |
|
|
GCI
1028
DELISTED
Gannett Co., Inc
GCI
| $280K | 0.01% |
28,127
+3,971
| +16% | +$43.1K |
|
1029
PUT
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $279K | 0.01% |
5,134
+1,562
| +44% | +$72.3K |
|
1030
CALL
IPG Photonics
IPGP
$3.89B
| $279K | 0.01% |
208
+71
| +52% | +$17.5K |
|
|
SYNH
1031
DELISTED
Syneos Health, Inc. Class A Common Stock
SYNH
| $279K | 0.01% |
+7,884
| New | +$309K |
|
|
GBT
1032
CALL
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $279K | 0.01% |
332
-324
| -49% | -$18.1K |
|
1033
Alerian MLP ETF
AMLP
$13B
| $278K | 0.01% |
5,949
+2,254
| +61% | +$120K |
|
1034
PUT
Mattel
MAT
$4.17B
| $278K | 0.01% |
900
-785
| -47% | -$12.2K |
|
1035
CALL
AT&T
T
$165B
| $277K | 0.01% |
4,932
-1,221
| -20% | -$34K |
|
1036
PUT
Charter Communications
CHTR
$15.2B
| $275K | 0.01% |
219
-257
| -54% | -$90.4K |
|
1037
PUT
Alaunos Therapeutics
TCRT
$4.74M
| $275K | 0.01% |
4
-3
| -43% | -$1.87K |
|
1038
PUT
Bunge Global
BG
$23.6B
| $273K | 0.01% |
972
+699
| +256% | +$52.8K |
|
1039
PUT
Exelixis
EXEL
$13.9B
| $273K | 0.01% |
668
-227
| -25% | -$6.28K |
|
1040
Nabors Industries
NBR
$1.23B
| $272K | 0.01% |
781
+115
| +17% | +$41.9K |
|
1041
CALL
Pfizer
PFE
$140B
| $272K | 0.01% |
2,944
+1,507
| +105% | +$51.8K |
|
1042
CALL
SolarEdge
SEDG
$2.59B
| $272K | 0.01% |
152
-351
| -70% | -$15.4K |
|
1043
JetBlue
JBLU
$1.96B
| $271K | 0.01% |
13,341
-32,464
| -71% | -$690K |
|
1044
LGI Homes
LGIH
$1.4B
| $271K | 0.01% |
3,841
+1,675
| +77% | +$113K |
|
1045
PUT
NXP Semiconductors
NXPI
$68B
| $271K | 0.01% |
757
-1,306
| -63% | -$158K |
|
1046
PUT
Colgate-Palmolive
CL
$72.6B
| $270K | 0.01% |
1,557
-280
| -15% | -$20.1K |
|
1047
Pan American Silver
PAAS
$18.6B
| $270K | 0.01% |
16,748
+1
| +0% | +$16 |
|
|
MNTA
1048
DELISTED
Momenta Pharmaceuticals, Inc.
MNTA
| $270K | 0.01% |
14,907
+4,288
| +40% | +$71.5K |
|
1049
Cenovus Energy
CVE
$54.6B
| $269K | 0.01% |
31,548
+7,690
| +32% | +$67.8K |
|
|
PXD
1050
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $269K | 0.01% |
309
-85
| -22% | -$15K |
|
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.