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 | |
|---|---|---|---|---|---|---|
676
PUT
Bilibili
BILI
$7.32B
| $5.01M | 0.01% |
2,645
+1,638
| +163% | +$28.7K |
|
677
CALL
NIO
NIO
$11.6B
| $4.99M | 0.01% |
9,781
+5,633
| +136% | +$39.9K |
|
678
CALL
Ciena
CIEN
$57.7B
| $4.97M | 0.01% |
1,332
+850
| +176% | +$33K |
|
|
RDS.B
679
DELISTED
Royal Dutch Shell PLC ADS Class B
RDS.B
| $4.96M | 0.01% |
77,556
+68,876
| +794% | +$4.35M |
|
680
PUT
Assured Guaranty
AGO
$3.73B
| $4.96M | 0.01% |
1,116
-92
| -8% | -$3.83K |
|
681
PUT
NRG Energy
NRG
$30.2B
| $4.96M | 0.01% |
1,167
+767
| +192% | +$31.7K |
|
|
PXD
682
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $4.95M | 0.01% |
325
-104
| -24% | -$14.7K |
|
683
CALL
Veeva Systems
VEEV
$29.2B
| $4.95M | 0.01% |
390
-221
| -36% | -$24.9K |
|
684
CALL
Capital One
COF
$123B
| $4.94M | 0.01% |
605
-179
| -23% | -$14.5K |
|
|
GOOS
685
PUT
Canada Goose Holdings
GOOS
$896M
| $4.93M | 0.01% |
1,027
+650
| +172% | +$33.1K |
|
|
MMP
686
CALL
DELISTED
Magellan Midstream Partners, L.P.
MMP
| $4.93M | 0.01% |
813
+669
| +465% | +$40.4K |
|
687
CALL
ASML
ASML
$693B
| $4.93M | 0.01% |
262
+109
| +71% | +$19.3K |
|
688
PUT
Hershey
HSY
$34.9B
| $4.93M | 0.01% |
429
+88
| +26% | +$9.58K |
|
|
ONCE
689
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $4.93M | 0.01% |
43,259
+26,327
| +155% | +$1.94M |
|
690
PUT
Waste Management
WM
$95.3B
| $4.92M | 0.01% |
474
-281
| -37% | -$27.4K |
|
691
CALL
Sensata Technologies
ST
$6.63B
| $4.92M | 0.01% |
1,093
+1,091
| +54,550% | +$51.8K |
|
692
CALL
Stryker
SYK
$122B
| $4.92M | 0.01% |
249
+167
| +204% | +$30.1K |
|
693
PUT
Weibo
WB
$1.92B
| $4.9M | 0.01% |
790
-24
| -3% | -$1.49K |
|
694
PUT
Papa John's
PZZA
$999M
| $4.89M | 0.01% |
924
+71
| +8% | +$3.14K |
|
695
PUT
TAL Education Group
TAL
$5.74B
| $4.89M | 0.01% |
1,356
+43
| +3% | +$1.4K |
|
696
CALL
Vail Resorts
MTN
$5.13B
| $4.89M | 0.01% |
225
-58
| -20% | -$11.8K |
|
697
CALL
Analog Devices
ADI
$185B
| $4.87M | 0.01% |
463
+53
| +13% | +$5.32K |
|
698
CALL
DexCom
DXCM
$27.2B
| $4.87M | 0.01% |
1,636
+1,536
| +1,536% | +$54K |
|
|
GRUB
699
CALL
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $4.87M | 0.01% |
351
+91
| +35% | +$14.1K |
|
|
IMMU
700
CALL
DELISTED
Immunomedics Inc
IMMU
| $4.87M | 0.01% |
2,535
+710
| +39% | +$11.4K |
|
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.