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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4051
CALL
Arthur J. Gallagher & Co
AJG
$69.1B
| $132K | ﹤0.01% |
17
-39
| -70% | -$3K |
|
4052
Ambarella
AMBA
$3.04B
| $132K | ﹤0.01% |
3,060
-33,206
| -92% | -$1.31M |
|
4053
CALL
CarGurus
CARG
$3.34B
| $132K | ﹤0.01% |
33
+18
| +120% | +$704 |
|
4054
PUT
Hewlett Packard
HPE
$58.8B
| $132K | ﹤0.01% |
86
-398
| -82% | -$6.13K |
|
4055
CALL
Banco Santander
SAN
$191B
| $132K | ﹤0.01% |
299
-87
| -23% | -$397 |
|
|
NSLR
4056
Neostellar Capital Corp
NSLR
$258M
| $132K | ﹤0.01% |
+20,831
| New | +$109K |
|
|
ONC
4057
CALL
BeOne Medicines Ltd
ONC
$33.9B
| $132K | ﹤0.01% |
10
-48
| -83% | -$6.48K |
|
4058
PUT
Lattice Semiconductor
LSCC
$16B
| $131K | ﹤0.01% |
110
+67
| +156% | +$669 |
|
4059
VanEck Rare Earth/Strategic Metals ETF
REMX
$1.91B
| $131K | ﹤0.01% |
2,783
+1,583
| +132% | +$71.7K |
|
4060
VanEck Retail ETF
RTH
$253M
| $131K | ﹤0.01% |
+1,258
| New | +$127K |
|
4061
SandRidge Energy
SD
$503M
| $131K | ﹤0.01% |
16,431
-55,438
| -77% | -$454K |
|
4062
PUT
Zumiez
ZUMZ
$330M
| $131K | ﹤0.01% |
53
+22
| +71% | +$522 |
|
4063
Edgewell Personal Care
EPC
$1.3B
| $130K | ﹤0.01% |
+2,967
| New | +$124K |
|
4064
PUT
Macerich
MAC
$7.4B
| $130K | ﹤0.01% |
30
+25
| +500% | +$1.1K |
|
4065
CALL
Magnite
MGNI
$2.83B
| $130K | ﹤0.01% |
215
-161
| -43% | -$829 |
|
4066
CALL
Navigator Holdings
NVGS
$1.35B
| $130K | ﹤0.01% |
119
+109
| +1,090% | +$1.12K |
|
4067
PUT
PBF Energy
PBF
$7.49B
| $130K | ﹤0.01% |
42
+9
| +27% | +$302 |
|
4068
CALL
Safety Insurance
SAFT
$1.51B
| $130K | ﹤0.01% |
+15
| New | +$1.28K |
|
4069
Yeti Holdings
YETI
$3.87B
| $130K | ﹤0.01% |
+4,326
| New | +$94.2K |
|
|
STML
4070
DELISTED
Stemline Therapeutics, Inc.
STML
| $130K | ﹤0.01% |
10,167
-26,140
| -72% | -$296K |
|
|
CBB
4071
CALL
DELISTED
Cincinnati Bell Inc.
CBB
| $130K | ﹤0.01% |
137
+79
| +136% | +$715 |
|
4072
CALL
Cal-Maine
CALM
$4.43B
| $129K | ﹤0.01% |
29
-61
| -68% | -$2.65K |
|
4073
Global X MSCI China Consumer Discretionary ETF
CHIQ
$131M
| $129K | ﹤0.01% |
7,770
-1,629
| -17% | -$24.7K |
|
4074
PUT
Navient
NAVI
$819M
| $129K | ﹤0.01% |
112
-55
| -33% | -$630 |
|
4075
Petrobras Class A
PBR.A
$106B
| $129K | ﹤0.01% |
+9,074
| New | +$127K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.