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 | |
|---|---|---|---|---|---|---|
2951
PUT
Stratasys
SSYS
$701M
| $378K | ﹤0.01% |
159
-59
| -27% | -$1.42K |
|
2952
PUT
American States Water
AWR
$3.36B
| $377K | ﹤0.01% |
53
+49
| +1,225% | +$3.36K |
|
2953
Box
BOX
$4.21B
| $377K | ﹤0.01% |
+19,556
| New | +$405K |
|
2954
Children's Place
PLCE
$52.9M
| $377K | ﹤0.01% |
+3,880
| New | +$354K |
|
|
ALDR
2955
DELISTED
Alder Biopharmaceuticals
ALDR
| $377K | ﹤0.01% |
27,663
+27,203
| +5,914% | +$352K |
|
2956
PUT
Alarm.com
ALRM
$2.66B
| $376K | ﹤0.01% |
58
+24
| +71% | +$1.46K |
|
2957
CALL
Enovis
ENOV
$1.61B
| $376K | ﹤0.01% |
+74
| New | +$3.25K |
|
2958
Aptiv
APTV
$12B
| $375K | ﹤0.01% |
4,722
-3,423
| -42% | -$263K |
|
2959
Booking.com
BKNG
$144B
| $375K | ﹤0.01% |
+5,375
| New | +$384K |
|
2960
CALL
Franco-Nevada
FNV
$41.6B
| $375K | ﹤0.01% |
50
-131
| -72% | -$9.72K |
|
2961
ProShares UltraPro S&P 500
UPRO
$5.08B
| $375K | ﹤0.01% |
+15,240
| New | +$336K |
|
2962
CALL
Boston Properties
BXP
$11.1B
| $374K | ﹤0.01% |
28
+22
| +367% | +$2.83K |
|
2963
Caesars Entertainment
CZR
$6.12B
| $374K | ﹤0.01% |
8,025
+5,732
| +250% | +$262K |
|
|
KW
2964
CALL
DELISTED
Kennedy-Wilson Holdings
KW
| $374K | ﹤0.01% |
175
+171
| +4,275% | +$3.47K |
|
2965
Direxion Daily S&P Biotech Bear 3X ETF
LABD
$64.7M
| $374K | ﹤0.01% |
102
-28
| -22% | -$136K |
|
2966
Louisiana-Pacific
LPX
$5.19B
| $374K | ﹤0.01% |
15,376
+11,986
| +354% | +$293K |
|
|
NAV
2967
CALL
DELISTED
Navistar International
NAV
| $374K | ﹤0.01% |
116
-179
| -61% | -$5.95K |
|
2968
PUT
Invesco DB Base Metals Fund
DBB
$308M
| $373K | ﹤0.01% |
230
-53
| -19% | -$861 |
|
2969
Glaukos
GKOS
$8.9B
| $373K | ﹤0.01% |
+4,770
| New | +$318K |
|
|
HBI
2970
PUT
DELISTED
Hanesbrands
HBI
| $373K | ﹤0.01% |
209
-764
| -79% | -$12.7K |
|
2971
CALL
Entergy
ETR
$53.3B
| $372K | ﹤0.01% |
78
-296
| -79% | -$13.4K |
|
2972
Olin
OLN
$2.52B
| $372K | ﹤0.01% |
16,106
-7,596
| -32% | -$182K |
|
|
NUAN
2973
PUT
DELISTED
Nuance Communications, Inc.
NUAN
| $372K | ﹤0.01% |
254
+239
| +1,593% | +$3.31K |
|
2974
CALL
ACI Worldwide
ACIW
$5.87B
| $371K | ﹤0.01% |
+113
| New | +$3.44K |
|
2975
Molina Healthcare
MOH
$10.7B
| $371K | ﹤0.01% |
+2,618
| New | +$354K |
|
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.