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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
DCP
1451
CALL
DELISTED
DCP Midstream, LP
DCP
| $3.8M | ﹤0.01% |
123,300
| – | – |
|
1452
CALL
Warner Music
WMG
$13.8B
| $3.79M | ﹤0.01% |
105,100
| – | – |
|
|
MAXR
1453
CALL
DELISTED
Maxar Technologies Inc. Common Stock
MAXR
| $3.78M | ﹤0.01% |
92,900
+800
| +0.9% | +$25.7K |
|
1454
PUT
Sonoco
SON
$5.76B
| $3.78M | ﹤0.01% |
56,700
| – | – |
|
|
SFIX
1455
PUT
Stitch Fix
SFIX
$478M
| $3.78M | ﹤0.01% |
60,000
+800
| +1% | +$37.4K |
|
|
AVLR
1456
CALL
DELISTED
Avalara, Inc.
AVLR
| $3.77M | ﹤0.01% |
23,400
+2,200
| +10% | +$378K |
|
1457
Stellantis
STLA
$16.5B
| $3.77M | ﹤0.01% |
189,865
+23,820
| +14% | +$471K |
|
1458
PUT
ZIM Integrated Shipping Services
ZIM
$3B
| $3.77M | ﹤0.01% |
88,800
+5,000
| +6% | +$234K |
|
1459
CALL
Sysco
SYY
$39.7B
| $3.76M | ﹤0.01% |
49,000
+200
| +0.4% | +$15.3K |
|
1460
CALL
Tanger
SKT
$4.82B
| $3.76M | ﹤0.01% |
194,700
-600
| -0.3% | -$10.4K |
|
1461
PUT
Smith & Wesson
SWBI
$655M
| $3.75M | ﹤0.01% |
106,200
+13,100
| +14% | +$315K |
|
1462
PUT
Hershey
HSY
$35.4B
| $3.75M | ﹤0.01% |
21,600
+900
| +4% | +$159K |
|
1463
CALL
Crocs
CROX
$6.69B
| $3.74M | ﹤0.01% |
32,000
| – | – |
|
1464
CALL
Park Hotels & Resorts
PK
$2.97B
| $3.74M | ﹤0.01% |
180,100
+100
| +0.1% | +$1.89K |
|
1465
PUT
Lincoln National
LNC
$7.91B
| $3.74M | ﹤0.01% |
58,100
+200
| +0.3% | +$13.1K |
|
1466
CALL
Dillards
DDS
$8.87B
| $3.73M | ﹤0.01% |
19,900
| – | – |
|
1467
CALL
NetApp
NTAP
$32.9B
| $3.73M | ﹤0.01% |
45,500
+800
| +2% | +$67.6K |
|
|
CGC
1468
PUT
Canopy Growth
CGC
$375M
| $3.73M | ﹤0.01% |
15,560
+460
| +3% | +$82.4K |
|
1469
PUT
Williams-Sonoma
WSM
$26.7B
| $3.72M | ﹤0.01% |
46,400
-400
| -0.9% | -$33.8K |
|
|
RIDE
1470
CALL
DELISTED
Lordstown Motors Corp. Class A Common Stock
RIDE
| $3.72M | ﹤0.01% |
23,947
+574
| +2% | +$59.7K |
|
1471
NextEra Energy
NEE
$187B
| $3.72M | ﹤0.01% |
50,099
-1,254
| -2% | -$101K |
|
|
AZPN
1472
PUT
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $3.72M | ﹤0.01% |
26,300
+100
| +0.4% | +$14.1K |
|
1473
CALL
SBA Communications
SBAC
$18.4B
| $3.71M | ﹤0.01% |
11,600
| – | – |
|
1474
PUT
Verisk Analytics
VRSK
$26.4B
| $3.71M | ﹤0.01% |
21,000
| – | – |
|
1475
PUT
Brunswick
BC
$5.19B
| $3.7M | ﹤0.01% |
37,000
+200
| +0.5% | +$19.9K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.