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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CNCE
1126
DELISTED
Concert Pharmaceuticals, Inc.
CNCE
| $222K | 0.01% |
15,058
+10,378
| +222% | +$151K |
|
|
ETFC
1127
CALL
DELISTED
E*Trade Financial Corporation
ETFC
| $222K | 0.01% |
635
-781
| -55% | -$31.7K |
|
1128
PUT
Pfizer
PFE
$143B
| $221K | 0.01% |
2,136
-2,934
| -58% | -$94.3K |
|
1129
CALL
Ally Financial
ALLY
$13.4B
| $220K | 0.01% |
758
-1,136
| -60% | -$25.4K |
|
1130
Compass Diversified
CODI
$746M
| $220K | 0.01% |
12,398
+12,159
| +5,087% | +$210K |
|
|
RDC
1131
DELISTED
Rowan Companies Plc
RDC
| $219K | 0.01% |
+17,062
| New | +$183K |
|
|
KS
1132
DELISTED
KapStone Paper and Pack Corp.
KS
| $219K | 0.01% |
10,191
-6,473
| -39% | -$144K |
|
1133
PUT
Expedia Group
EXPE
$30.9B
| $218K | 0.01% |
806
+86
| +12% | +$12.7K |
|
1134
CALL
International Paper
IP
$20.1B
| $218K | 0.01% |
1,008
-910
| -47% | -$47.8K |
|
|
NVEE
1135
DELISTED
NV5 Global
NVEE
| $218K | 0.01% |
16,000
+15,236
| +1,994% | +$172K |
|
|
POT
1136
PUT
DELISTED
Potash Corp Of Saskatchewan
POT
| $218K | 0.01% |
1,316
+370
| +39% | +$6.59K |
|
1137
CALL
Kohl's
KSS
$2.06B
| $217K | 0.01% |
1,223
-99
| -7% | -$4.06K |
|
|
ESIO
1138
DELISTED
Electro Scientific Industries
ESIO
| $217K | 0.01% |
+15,602
| New | +$169K |
|
1139
Ligand Pharmaceuticals
LGND
$6.06B
| $216K | 0.01% |
+2,549
| New | +$202K |
|
1140
CALL
TripAdvisor
TRIP
$1.57B
| $216K | 0.01% |
940
-391
| -29% | -$15.9K |
|
1141
CALL
Icon
ICLR
$13.1B
| $215K | 0.01% |
79
+3
| +4% | +$319 |
|
1142
CALL
Itaú Unibanco
ITUB
$92B
| $215K | 0.01% |
1,398
-193
| -12% | -$1.18K |
|
1143
PUT
Transocean
RIG
$5.89B
| $215K | 0.01% |
2,915
+1,792
| +160% | +$15.4K |
|
|
MNTA
1144
DELISTED
Momenta Pharmaceuticals, Inc.
MNTA
| $215K | 0.01% |
+11,672
| New | +$195K |
|
1145
CALL
BP
BP
$113B
| $214K | 0.01% |
911
-2,136
| -70% | -$67.9K |
|
1146
ProShares UltraShort Bloomberg Natural Gas
KOLD
$108M
| $214K | 0.01% |
638
+578
| +963% | +$198K |
|
1147
CALL
Teva Pharmaceuticals
TEVA
$36.3B
| $214K | 0.01% |
5,208
+588
| +13% | +$13.2K |
|
|
ESRX
1148
PUT
DELISTED
Express Scripts Holding Company
ESRX
| $214K | 0.01% |
1,302
-115
| -8% | -$7.15K |
|
1149
eHealth
EHTH
$42.9M
| $213K | 0.01% |
8,926
-21,503
| -71% | -$438K |
|
|
EXAS
1150
DELISTED
Exact Sciences
EXAS
| $213K | 0.01% |
4,523
-4,789
| -51% | -$193K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.