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 | |
|---|---|---|---|---|---|---|
3476
CALL
Forestar Group
FOR
$1.47B
| $14K | ﹤0.01% |
316
-207
| -40% | -$3.56K |
|
3477
CALL
The Greenbrier Companies
GBX
$1.56B
| $14K | ﹤0.01% |
107
-70
| -40% | -$3.1K |
|
3478
CALL
HEICO Corp Class A
HEI.A
$36.3B
| $14K | ﹤0.01% |
13
-57
| -81% | -$2.61K |
|
|
HIMX
3479
PUT
Himax Technologies
HIMX
$2.22B
| $14K | ﹤0.01% |
268
+101
| +60% | +$917 |
|
|
HTBK
3480
DELISTED
Heritage Commerce
HTBK
| $14K | ﹤0.01% |
1,019
-563
| -36% | -$7.71K |
|
3481
CALL
Imperial Oil
IMO
$60.8B
| $14K | ﹤0.01% |
+67
| New | +$1.99K |
|
|
JKS
3482
JinkoSolar
JKS
$799M
| $14K | ﹤0.01% |
+593
| New | +$15.4K |
|
3483
PUT
CarMax
KMX
$8.29B
| $14K | ﹤0.01% |
609
-338
| -36% | -$22.5K |
|
3484
CALL
Loews
L
$24.4B
| $14K | ﹤0.01% |
+57
| New | +$2.71K |
|
3485
Marchex
MCHX
$79.3M
| $14K | ﹤0.01% |
+4,573
| New | +$13.6K |
|
3486
CALL
MiMedx Group
MDXG
$635M
| $14K | ﹤0.01% |
341
-566
| -62% | -$8.39K |
|
3487
PUT
Mohawk Industries
MHK
$7.05B
| $14K | ﹤0.01% |
80
+58
| +264% | +$14.4K |
|
3488
PUT
MannKind Corp
MNKD
$1.22B
| $14K | ﹤0.01% |
86
-78
| -48% | -$122 |
|
3489
CALL
McEwen Inc
MUX
$1.04B
| $14K | ﹤0.01% |
+137
| New | +$3.35K |
|
3490
CALL
NN Inc
NNBR
$273M
| $14K | ﹤0.01% |
+91
| New | +$2.47K |
|
3491
CALL
Omnicom Group
OMC
$23.5B
| $14K | ﹤0.01% |
87
+69
| +383% | +$5.32K |
|
3492
CALL
Douglas Dynamics
PLOW
$1.04B
| $14K | ﹤0.01% |
27
+11
| +69% | +$375 |
|
3493
CALL
PTC
PTC
$14.5B
| $14K | ﹤0.01% |
258
+191
| +285% | +$10.6K |
|
3494
CALL
Q2 Holdings
QTWO
$3.64B
| $14K | ﹤0.01% |
161
-133
| -45% | -$5.2K |
|
3495
CALL
FreightCar America
RAIL
$279M
| $14K | ﹤0.01% |
33
-41
| -55% | -$722 |
|
3496
Rogers Communications
RCI
$17.7B
| $14K | ﹤0.01% |
279
+49
| +21% | +$2.5K |
|
3497
CALL
Rockwell Medical
RMTI
$27.6M
| – | – |
-2
| Closed | -$1.53K |
|
3498
Saia
SAIA
$11.2B
| $14K | ﹤0.01% |
+239
| New | +$13.2K |
|
3499
Schwab U.S Small- Cap ETF
SCHA
$22.4B
| $14K | ﹤0.01% |
848
+628
| +285% | +$10.1K |
|
|
SUP
3500
DELISTED
Superior Industries International
SUP
| $14K | ﹤0.01% |
875
+152
| +21% | +$2.59K |
|
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.