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 | |
|---|---|---|---|---|---|---|
|
GWPH
1101
CALL
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $2.73M | 0.01% |
162
-65
| -29% | -$9.67K |
|
1102
PUT
Alaska Air
ALK
$5.15B
| $2.73M | 0.01% |
486
+66
| +16% | +$4.03K |
|
1103
CALL
Dolby
DLB
$4.72B
| $2.73M | 0.01% |
433
+432
| +43,200% | +$27.6K |
|
1104
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
| $2.73M | 0.01% |
1,015
+439
| +76% | +$10.3K |
|
1105
PUT
Nucor
NUE
$56.4B
| $2.72M | 0.01% |
467
+235
| +101% | +$13.8K |
|
1106
PUT
Zions Bancorporation
ZION
$10.1B
| $2.72M | 0.01% |
599
+490
| +450% | +$23.4K |
|
|
DOCU
1107
PUT
DocuSign
DOCU
$9.63B
| $2.72M | 0.01% |
524
+33
| +7% | +$1.68K |
|
1108
CALL
MPLX
MPLX
$59.5B
| $2.71M | 0.01% |
824
+512
| +164% | +$17.2K |
|
1109
PUT
Liberty Media Series A
FWONA
$22.3B
| $2.71M | 0.01% |
753
+542
| +257% | +$16.4K |
|
1110
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $2.7M | 0.01% |
189
+171
| +950% | +$22.3K |
|
1111
PUT
HCA Healthcare
HCA
$84.8B
| $2.7M | 0.01% |
207
-188
| -48% | -$25.3K |
|
1112
McKesson
MCK
$98.5B
| $2.69M | 0.01% |
23,000
+13,919
| +153% | +$1.72M |
|
1113
PUT
Fate Therapeutics
FATE
$281M
| $2.69M | 0.01% |
1,530
+1,147
| +299% | +$18.1K |
|
1114
CALL
Old Dominion Freight Line
ODFL
$48.5B
| $2.69M | 0.01% |
558
+384
| +221% | +$17.9K |
|
|
ZAYO
1115
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $2.69M | 0.01% |
94,490
+59,644
| +171% | +$1.58M |
|
1116
PUT
Molina Healthcare
MOH
$10.3B
| $2.68M | 0.01% |
189
-29
| -13% | -$3.92K |
|
1117
CALL
Harley-Davidson
HOG
$2.68B
| $2.68M | 0.01% |
752
-106
| -12% | -$3.86K |
|
1118
PUT
Columbia Sportswear
COLM
$3.19B
| $2.68M | 0.01% |
257
-56
| -18% | -$5.4K |
|
1119
PUT
Canadian Solar
CSIQ
$906M
| $2.68M | 0.01% |
1,437
-798
| -36% | -$16.4K |
|
1120
Zoetis
ZTS
$31.6B
| $2.68M | 0.01% |
26,582
+18,336
| +222% | +$1.66M |
|
1121
Valero Energy
VLO
$89.8B
| $2.67M | 0.01% |
+31,512
| New | +$2.6M |
|
|
MDCO
1122
PUT
DELISTED
Medicines Co
MDCO
| $2.66M | 0.01% |
953
-282
| -23% | -$6.65K |
|
1123
PUT
APA Corp
APA
$12.8B
| $2.65M | 0.01% |
766
+216
| +39% | +$7.04K |
|
|
IDTI
1124
PUT
DELISTED
Integrated Device Technology I
IDTI
| $2.65M | 0.01% |
541
+370
| +216% | +$17.9K |
|
1125
PUT
Westlake Corp
WLK
$9.46B
| $2.65M | 0.01% |
390
+66
| +20% | +$4.78K |
|
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.