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 | |
|---|---|---|---|---|---|---|
3901
PUT
Jack Henry & Associates
JKHY
$11.5B
| $152K | ﹤0.01% |
11
+1
| +10% | +$132 |
|
3902
PUT
SL Green Realty
SLG
$3.87B
| $152K | ﹤0.01% |
18
-4
| -18% | -$347 |
|
|
TMHC
3903
CALL
DELISTED
Taylor Morrison
TMHC
| $152K | ﹤0.01% |
86
+85
| +8,500% | +$1.52K |
|
3904
ProShares UltraPro QQQ
TQQQ
$29.6B
| $152K | ﹤0.01% |
+21,536
| New | +$130K |
|
3905
CALL
Antero Resources
AR
$10.9B
| $151K | ﹤0.01% |
172
-169
| -50% | -$1.6K |
|
3906
CALL
Accuray
ARAY
$27.8M
| $151K | ﹤0.01% |
317
+306
| +2,782% | +$1.39K |
|
3907
PUT
Century Aluminum
CENX
$4.21B
| $151K | ﹤0.01% |
171
-215
| -56% | -$1.86K |
|
3908
Equinix
EQIX
$99.8B
| $151K | ﹤0.01% |
335
-655
| -66% | -$267K |
|
3909
PUT
Magnite
MGNI
$2.83B
| $151K | ﹤0.01% |
249
+214
| +611% | +$1.1K |
|
|
CALA
3910
PUT
DELISTED
Calithera Biosciences, Inc
CALA
| $151K | ﹤0.01% |
+11
| New | +$1.16K |
|
|
FBC
3911
PUT
DELISTED
Flagstar Bancorp, Inc. New
FBC
| $151K | ﹤0.01% |
+46
| New | +$1.44K |
|
|
AGEN
3912
CALL
Agenus
AGEN
$281M
| $150K | ﹤0.01% |
26
-18
| -41% | -$1.12K |
|
3913
PUT
Bankunited
BKU
$3.37B
| $150K | ﹤0.01% |
45
-35
| -44% | -$1.21K |
|
3914
FTI Consulting
FCN
$5.2B
| $150K | ﹤0.01% |
1,956
-976
| -33% | -$68.9K |
|
3915
PUT
Hudbay
HBM
$9.72B
| $150K | ﹤0.01% |
211
+197
| +1,407% | +$1.22K |
|
3916
PUT
Star Bulk Carriers
SBLK
$3.07B
| $150K | ﹤0.01% |
228
-380
| -63% | -$3.06K |
|
3917
STAAR Surgical
STAA
$1.2B
| $150K | ﹤0.01% |
+4,413
| New | +$156K |
|
|
ECHO
3918
DELISTED
Echo Global Logistics, Inc.
ECHO
| $150K | ﹤0.01% |
6,093
+1,693
| +38% | +$39.9K |
|
|
GLUU
3919
CALL
DELISTED
Glu Mobile Inc.
GLUU
| $150K | ﹤0.01% |
138
-447
| -76% | -$4.21K |
|
3920
CALL
Advanced Energy
AEIS
$10.2B
| $149K | ﹤0.01% |
30
-17
| -36% | -$826 |
|
3921
PUT
Community Bank
CBU
$3.41B
| $149K | ﹤0.01% |
+25
| New | +$1.54K |
|
|
CIVI
3922
CALL
DELISTED
Civitas Resources
CIVI
| $149K | ﹤0.01% |
66
-27
| -29% | -$622 |
|
3923
Eversource Energy
ES
$28.2B
| $149K | ﹤0.01% |
2,109
-1,739
| -45% | -$120K |
|
|
SHOE
3924
PUT
Shoe Station Group
SHOE
$418M
| $149K | ﹤0.01% |
+88
| New | +$1.6K |
|
3925
ProShares Ultra S&P500
SSO
$7.64B
| $149K | ﹤0.01% |
+10,120
| New | +$138K |
|
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.