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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2701
PUT
Cogent Communications
CCOI
$594M
| $307K | ﹤0.01% |
68
-42
| -38% | -$2.08K |
|
|
GES
2702
CALL
DELISTED
Guess Inc
GES
| $307K | ﹤0.01% |
148
+68
| +85% | +$1.44K |
|
2703
CALL
Semtech
SMTC
$11.7B
| $307K | ﹤0.01% |
67
-38
| -36% | -$1.81K |
|
|
LL
2704
DELISTED
LL Flooring Holdings, Inc.
LL
| $307K | ﹤0.01% |
+32,292
| New | +$391K |
|
|
CNSL
2705
PUT
DELISTED
Consolidated Communications Holdings, Inc.
CNSL
| $306K | ﹤0.01% |
310
+146
| +89% | +$1.79K |
|
|
SGEN
2706
DELISTED
Seagen Inc. Common Stock
SGEN
| $306K | ﹤0.01% |
5,415
-680
| -11% | -$42.6K |
|
2707
CALL
Acadia Healthcare
ACHC
$3.17B
| $305K | ﹤0.01% |
119
+77
| +183% | +$2.67K |
|
2708
PUT
Globe Life
GL
$13.5B
| $305K | ﹤0.01% |
41
-102
| -71% | -$8.48K |
|
2709
PUT
National Healthcare
NHC
$3.53B
| $305K | ﹤0.01% |
39
-26
| -40% | -$2.04K |
|
|
ESV
2710
CALL
DELISTED
Ensco Rowan plc
ESV
| $305K | ﹤0.01% |
215
-160
| -43% | -$4.12K |
|
2711
PUT
nLIGHT
LASR
$3.95B
| $304K | ﹤0.01% |
+171
| New | +$3.24K |
|
|
GMLP
2712
PUT
DELISTED
Golar LNG Partners LP
GMLP
| $304K | ﹤0.01% |
282
-479
| -63% | -$6.3K |
|
2713
CALL
Calix
CALX
$2.27B
| $303K | ﹤0.01% |
311
+19
| +7% | +$165 |
|
2714
LivaNova
LIVN
$4.3B
| $303K | ﹤0.01% |
3,320
-2,250
| -40% | -$242K |
|
2715
CALL
New York Times
NYT
$11.6B
| $303K | ﹤0.01% |
136
+124
| +1,033% | +$3.14K |
|
|
KEM
2716
PUT
DELISTED
KEMET Corporation
KEM
| $303K | ﹤0.01% |
173
-708
| -80% | -$13.2K |
|
|
BRSL
2717
CALL
Brightstar Lottery PLC
BRSL
$1.91B
| $302K | ﹤0.01% |
207
-296
| -59% | -$4.89K |
|
2718
CALL
American Eagle Outfitters
AEO
$2.85B
| $301K | ﹤0.01% |
156
-313
| -67% | -$6.52K |
|
2719
PUT
Cheesecake Factory
CAKE
$4.21B
| $300K | ﹤0.01% |
69
-40
| -37% | -$1.94K |
|
2720
PUT
Medifast
MED
$108M
| $300K | ﹤0.01% |
24
-108
| -82% | -$18.5K |
|
2721
PUT
Nokia
NOK
$50.8B
| $300K | ﹤0.01% |
517
-65
| -11% | -$365 |
|
|
CTB
2722
CALL
DELISTED
Cooper Tire & Rubber Co.
CTB
| $300K | ﹤0.01% |
93
-28
| -23% | -$850 |
|
2723
CALL
DexCom
DXCM
$27.6B
| $299K | ﹤0.01% |
100
+20
| +25% | +$634 |
|
2724
PUT
Invesco
IVZ
$13.3B
| $299K | ﹤0.01% |
179
+74
| +70% | +$1.48K |
|
2725
PUT
Ashland
ASH
$3.04B
| $298K | ﹤0.01% |
42
-53
| -56% | -$4.09K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.