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 | |
|---|---|---|---|---|---|---|
1076
PUT
Knight Transportation
KNX
$11.9B
| $2.82M | 0.01% |
863
+24
| +3% | +$764 |
|
1077
PUT
A.O. Smith
AOS
$8.36B
| $2.81M | 0.01% |
528
-146
| -22% | -$7.26K |
|
|
LM
1078
PUT
DELISTED
Legg Mason, Inc.
LM
| $2.81M | 0.01% |
1,028
-108
| -10% | -$3.1K |
|
1079
CALL
Etsy
ETSY
$7.66B
| $2.81M | 0.01% |
418
-87
| -17% | -$5.19K |
|
1080
CALL
IQVIA
IQV
$35B
| $2.81M | 0.01% |
195
+134
| +220% | +$17.9K |
|
1081
CALL
Ross Stores
ROST
$76.5B
| $2.8M | 0.01% |
301
-92
| -23% | -$8.44K |
|
1082
PUT
Visteon
VC
$2.8B
| $2.79M | 0.01% |
415
+371
| +843% | +$27.9K |
|
1083
PUT
Qiagen
QGEN
$8.53B
| $2.79M | 0.01% |
647
+554
| +596% | +$22.3K |
|
1084
PUT
Zillow
Z
$7.08B
| $2.79M | 0.01% |
806
-508
| -39% | -$18.1K |
|
|
CJ
1085
CALL
DELISTED
C&J Energy Services, Inc.
CJ
| $2.78M | 0.01% |
1,792
+1,737
| +3,158% | +$28K |
|
|
SBNY
1086
PUT
DELISTED
Signature Bank
SBNY
| $2.78M | 0.01% |
217
-56
| -21% | -$7.13K |
|
1087
CALL
Helmerich & Payne
HP
$3.53B
| $2.77M | 0.01% |
499
+266
| +114% | +$14.5K |
|
1088
CALL
Lumentum
LITE
$59.6B
| $2.77M | 0.01% |
+490
| New | +$23.5K |
|
1089
PUT
Encompass Health
EHC
$11.2B
| $2.77M | 0.01% |
596
+200
| +51% | +$10.1K |
|
1090
PUT
Martin Marietta Materials
MLM
$33.7B
| $2.76M | 0.01% |
137
-93
| -40% | -$17.4K |
|
1091
CALL
Alexandria Real Estate Equities
ARE
$8.85B
| $2.75M | 0.01% |
193
+192
| +19,200% | +$25.3K |
|
1092
CALL
M&T Bank
MTB
$36.1B
| $2.75M | 0.01% |
175
| – | – |
|
1093
CALL
H&R Block
HRB
$5.19B
| $2.75M | 0.01% |
1,147
+785
| +217% | +$19.3K |
|
1094
PUT
CMS Energy
CMS
$23.1B
| $2.74M | 0.01% |
+494
| New | +$26K |
|
1095
Spotify
SPOT
$99.1B
| $2.74M | 0.01% |
19,745
+4,672
| +31% | +$639K |
|
1096
CALL
Monster Beverage
MNST
$91.1B
| $2.74M | 0.01% |
1,004
+678
| +208% | +$19.3K |
|
1097
PUT
Levi Strauss
LEVI
$9.44B
| $2.73M | 0.01% |
+1,161
| New | +$26K |
|
1098
AB InBev
BUD
$158B
| $2.73M | 0.01% |
32,530
+16,648
| +105% | +$1.28M |
|
1099
CALL
Capri Holdings
CPRI
$1.79B
| $2.73M | 0.01% |
597
-90
| -13% | -$3.93K |
|
1100
PUT
State Street
STT
$50.8B
| $2.73M | 0.01% |
415
+176
| +74% | +$12.2K |
|
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.