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 | |
|---|---|---|---|---|---|---|
601
PUT
Diamondback Energy
FANG
$57.9B
| $5.79M | 0.02% |
570
-49
| -8% | -$5.02K |
|
602
CALL
Boston Scientific
BSX
$64.5B
| $5.75M | 0.02% |
1,497
-273
| -15% | -$10.4K |
|
|
DISH
603
PUT
DELISTED
DISH Network Corp.
DISH
| $5.75M | 0.02% |
1,813
-574
| -24% | -$17.6K |
|
604
CALL
J.M. Smucker
SJM
$12.3B
| $5.73M | 0.02% |
492
+347
| +239% | +$36.3K |
|
605
CALL
Keysight
KEYS
$55.6B
| $5.68M | 0.02% |
652
+222
| +52% | +$17.2K |
|
606
PUT
Bausch Health
BHC
$1.67B
| $5.67M | 0.02% |
2,296
-1,430
| -38% | -$34.2K |
|
607
CALL
Lennox International
LII
$18.6B
| $5.66M | 0.02% |
214
+212
| +10,600% | +$50.7K |
|
608
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$742M
| $5.65M | 0.02% |
1,173
-673
| -36% | -$13K |
|
609
PUT
Albemarle
ALB
$13.7B
| $5.65M | 0.02% |
689
+195
| +39% | +$15.9K |
|
610
CALL
Public Storage
PSA
$55.1B
| $5.64M | 0.02% |
259
+150
| +138% | +$31.4K |
|
611
PepsiCo
PEP
$184B
| $5.63M | 0.02% |
45,906
+20,868
| +83% | +$2.38M |
|
|
TSS
612
CALL
DELISTED
Total System Services, Inc.
TSS
| $5.62M | 0.02% |
591
+277
| +88% | +$25K |
|
613
CALL
Air Products & Chemicals
APD
$65.7B
| $5.61M | 0.02% |
294
-146
| -33% | -$25.1K |
|
614
CALL
APA Corp
APA
$13B
| $5.61M | 0.02% |
1,618
-1,438
| -47% | -$46.9K |
|
615
DuPont de Nemours
DD
$18.5B
| $5.6M | 0.02% |
41,470
+960
| +2% | +$133K |
|
616
PUT
NIO
NIO
$11.6B
| $5.59M | 0.02% |
10,956
+9,704
| +775% | +$68.8K |
|
617
CALL
Cadence Design Systems
CDNS
$91.8B
| $5.56M | 0.02% |
875
+296
| +51% | +$15.7K |
|
|
KFYP
618
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $5.55M | 0.02% |
1,191
+458
| +62% | +$11.4K |
|
619
iShares MSCI Japan ETF
EWJ
$21.7B
| $5.54M | 0.02% |
+101,341
| New | +$5.46M |
|
620
CALL
L3Harris
LHX
$55.5B
| $5.53M | 0.02% |
346
+75
| +28% | +$11.6K |
|
|
DISCK
621
CALL
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $5.52M | 0.02% |
2,065
+1,552
| +303% | +$40.6K |
|
622
PUT
Pultegroup
PHM
$23.5B
| $5.5M | 0.02% |
1,969
+279
| +17% | +$7.6K |
|
623
CALL
LyondellBasell Industries
LYB
$19.9B
| $5.5M | 0.02% |
654
+239
| +58% | +$20.7K |
|
624
CALL
Tencent Music
TME
$14.3B
| $5.49M | 0.02% |
3,032
+2,896
| +2,129% | +$46.2K |
|
|
MASI
625
CALL
DELISTED
Masimo
MASI
| $5.47M | 0.02% |
396
+376
| +1,880% | +$47.2K |
|
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.