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 | |
|---|---|---|---|---|---|---|
2751
CALL
Winnebago Industries
WGO
$870M
| $457K | ﹤0.01% |
147
+105
| +250% | +$3.15K |
|
2752
CALL
Applied Optoelectronics
AAOI
$8.04B
| $456K | ﹤0.01% |
374
-56
| -13% | -$844 |
|
2753
CALL
Toll Brothers
TOL
$14B
| $456K | ﹤0.01% |
126
-98
| -44% | -$3.52K |
|
2754
Equifax
EFX
$20.3B
| $455K | ﹤0.01% |
3,847
+2,561
| +199% | +$273K |
|
2755
PUT
M&T Bank
MTB
$36.2B
| $455K | ﹤0.01% |
29
-1
| -3% | -$164 |
|
2756
iShares Core S&P Total US Stock Market ETF
ITOT
$93.2B
| $454K | ﹤0.01% |
7,056
+2,738
| +63% | +$170K |
|
2757
PUT
Suburban Propane Partners
SPH
$1.23B
| $454K | ﹤0.01% |
203
-18
| -8% | -$397 |
|
|
EFOR
2758
Everforth Inc
EFOR
$845M
| $453K | ﹤0.01% |
+7,140
| New | +$446K |
|
2759
CALL
Jack in the Box
JACK
$278M
| $453K | ﹤0.01% |
56
-45
| -45% | -$3.6K |
|
2760
CALL
Dave & Buster's
PLAY
$343M
| $453K | ﹤0.01% |
91
-102
| -53% | -$5K |
|
2761
CALL
Invesco Aerospace & Defense ETF
PPA
$8.27B
| $453K | ﹤0.01% |
55
+40
| +267% | +$2.24K |
|
2762
CALL
Unum
UNM
$13.8B
| $453K | ﹤0.01% |
134
-580
| -81% | -$20.2K |
|
2763
CALL
AppFolio
APPF
$5.85B
| $452K | ﹤0.01% |
57
+55
| +2,750% | +$3.68K |
|
2764
PUT
Precigen
PGEN
$1.93B
| $452K | ﹤0.01% |
861
+491
| +133% | +$3.4K |
|
2765
Antero Midstream
AM
$10.8B
| $451K | ﹤0.01% |
32,768
+32,289
| +6,741% | +$422K |
|
2766
CALL
Q2 Holdings
QTWO
$3.42B
| $450K | ﹤0.01% |
65
+61
| +1,525% | +$3.81K |
|
2767
CALL
US Foods
USFD
$21.4B
| $450K | ﹤0.01% |
129
+98
| +316% | +$3.36K |
|
|
RAD
2768
CALL
DELISTED
Rite Aid Corporation
RAD
| $450K | ﹤0.01% |
355
+67
| +23% | +$1.03K |
|
2769
BioMarin Pharmaceuticals
BMRN
$11.5B
| $448K | ﹤0.01% |
5,051
+381
| +8% | +$35.3K |
|
2770
PUT
Select Water Solutions
WTTR
$2.51B
| $448K | ﹤0.01% |
373
+369
| +9,225% | +$3.47K |
|
2771
PUT
Canadian National Railway
CNI
$78.3B
| $447K | ﹤0.01% |
50
-2
| -4% | -$168 |
|
2772
PUT
Principal Financial Group
PFG
$23.6B
| $446K | ﹤0.01% |
89
+74
| +493% | +$3.67K |
|
|
MDSO
2773
PUT
DELISTED
Medidata Solutions, Inc.
MDSO
| $446K | ﹤0.01% |
61
+34
| +126% | +$2.45K |
|
|
CBLK
2774
CALL
DELISTED
Carbon Black, Inc. Common Stock
CBLK
| $446K | ﹤0.01% |
320
-351
| -52% | -$5.01K |
|
2775
MBIA
MBI
$288M
| $445K | ﹤0.01% |
+46,750
| New | +$459K |
|
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.