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 | |
|---|---|---|---|---|---|---|
2976
PUT
CorMedix
CRMD
$617M
| $24K | ﹤0.01% |
+11
| New | +$23 |
|
2977
CALL
Crane NXT
CXT
$3.04B
| $24K | ﹤0.01% |
466
+374
| +407% | +$10K |
|
2978
CALL
CoreCivic
CXW
$3.1B
| $24K | ﹤0.01% |
313
-106
| -25% | -$2.82K |
|
2979
PUT
HF Sinclair
DINO
$15.9B
| $24K | ﹤0.01% |
560
+324
| +137% | +$9.74K |
|
2980
Eversource Energy
ES
$28.2B
| $24K | ﹤0.01% |
407
-11,764
| -97% | -$726K |
|
2981
CALL
Fortinet
FTNT
$112B
| $24K | ﹤0.01% |
1,740
-1,335
| -43% | -$10.1K |
|
2982
First Trust Financials AlphaDEX Fund
FXO
$1.12B
| $24K | ﹤0.01% |
818
+300
| +58% | +$8.71K |
|
2983
PUT
Globus Medical
GMED
$10.4B
| $24K | ﹤0.01% |
+198
| New | +$6.05K |
|
2984
PUT
Invesco
IVZ
$13.3B
| $24K | ﹤0.01% |
121
+7
| +6% | +$239 |
|
2985
CALL
Kennametal
KMT
$2.68B
| $24K | ﹤0.01% |
139
+50
| +56% | +$1.85K |
|
2986
PUT
Marathon Digital Holdings
MARA
$4.62B
| $24K | ﹤0.01% |
+3
| New | +$16 |
|
2987
CALL
NMI Holdings
NMIH
$3.25B
| $24K | ﹤0.01% |
339
-18
| -5% | -$209 |
|
2988
Novavax
NVAX
$1.23B
| $24K | ﹤0.01% |
+1,077
| New | +$24.1K |
|
2989
Photronics
PLAB
$1.79B
| $24K | ﹤0.01% |
2,719
+1,986
| +271% | +$17.6K |
|
2990
CALL
Planet Fitness
PLNT
$4.23B
| $24K | ﹤0.01% |
38
-106
| -74% | -$2.58K |
|
2991
PUT
Phillips 66
PSX
$82.9B
| $24K | ﹤0.01% |
482
-81
| -14% | -$6.86K |
|
2992
PUT
Repligen
RGEN
$7.44B
| $24K | ﹤0.01% |
75
+16
| +27% | +$671 |
|
2993
Stepan Co
SCL
$1.31B
| $24K | ﹤0.01% |
+288
| New | +$23.7K |
|
|
SKX
2994
PUT
DELISTED
Skechers
SKX
| $24K | ﹤0.01% |
179
-22
| -11% | -$601 |
|
2995
CALL
Steel Dynamics
STLD
$35.6B
| $24K | ﹤0.01% |
321
-775
| -71% | -$27.2K |
|
2996
CALL
Unilever
UL
$131B
| $24K | ﹤0.01% |
112
-78
| -41% | -$5.01K |
|
2997
CALL
Varex Imaging
VREX
$460M
| $24K | ﹤0.01% |
52
-72
| -58% | -$2.25K |
|
2998
PUT
Wabtec
WAB
$51.1B
| $24K | ﹤0.01% |
+57
| New | +$4.39K |
|
2999
PUT
Workday
WDAY
$33.4B
| $24K | ﹤0.01% |
304
+32
| +12% | +$3.3K |
|
|
ONC
3000
CALL
BeOne Medicines Ltd
ONC
$33.8B
| $24K | ﹤0.01% |
+9
| New | +$671 |
|
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.