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 | Miscellaneous | 97.72% |
| 2 | Technology | 0.49% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.27% |
| 5 | Healthcare | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1426
CALL
Macerich
MAC
$6.59B
| $3.9M | ﹤0.01% |
210,700
-800
| -0.4% | -$13.6K |
|
1427
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.97B
| $3.9M | ﹤0.01% |
20,200
+100
| +0.5% | +$31.7K |
|
1428
CALL
Boston Scientific
BSX
$69.3B
| $3.89M | ﹤0.01% |
89,700
+6,800
| +8% | +$301K |
|
1429
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$11.2M
| $3.89M | ﹤0.01% |
105,300
+700
| +0.7% | +$34.6K |
|
|
CALY
1430
PUT
Callaway Golf Company
CALY
$2.84B
| $3.89M | ﹤0.01% |
115,900
+100
| +0.1% | +$3.04K |
|
1431
CALL
Deutsche Bank
DB
$77.7B
| $3.88M | ﹤0.01% |
294,700
-200
| -0.1% | -$2.51K |
|
1432
CALL
nLIGHT
LASR
$2.31B
| $3.87M | ﹤0.01% |
106,800
| – | – |
|
1433
CALL
Bionano Genomics
BNGO
$14.1M
| $3.86M | ﹤0.01% |
944
-26
| -3% | -$90.9K |
|
|
NNDM
1434
PUT
Nano Dimension
NNDM
$342M
| $3.85M | ﹤0.01% |
481,900
-3,100
| -0.6% | -$19.5K |
|
1435
PUT
Dillards
DDS
$10.3B
| $3.84M | ﹤0.01% |
20,500
+200
| +1% | +$38.1K |
|
|
RIDE
1436
PUT
DELISTED
Lordstown Motors Corp. Class A Common Stock
RIDE
| $3.84M | ﹤0.01% |
24,733
+1,173
| +5% | +$122K |
|
1437
TJX Companies
TJX
$145B
| $3.83M | ﹤0.01% |
56,490
-3,675
| -6% | -$257K |
|
|
HES
1438
CALL
DELISTED
Hess
HES
| $3.83M | ﹤0.01% |
43,100
| – | – |
|
|
ATCO
1439
CALL
DELISTED
Atlas Corp.
ATCO
| $3.83M | ﹤0.01% |
269,200
+8,600
| +3% | +$123K |
|
1440
CALL
Fortinet
FTNT
$115B
| $3.83M | ﹤0.01% |
79,000
+6,000
| +8% | +$347K |
|
1441
CALL
B&G Foods
BGS
$267M
| $3.82M | ﹤0.01% |
120,700
-2,100
| -2% | -$63K |
|
1442
Diamondback Energy
FANG
$55.8B
| $3.82M | ﹤0.01% |
38,355
-2,750
| -7% | -$221K |
|
1443
Union Pacific
UNP
$172B
| $3.82M | ﹤0.01% |
17,084
-1,337
| -7% | -$289K |
|
1444
PUT
Green Plains
GPRE
$1.08B
| $3.82M | ﹤0.01% |
111,100
-400
| -0.4% | -$13.7K |
|
1445
CALL
Quest Diagnostics
DGX
$26.2B
| $3.81M | ﹤0.01% |
28,700
+200
| +0.7% | +$29.3K |
|
1446
PUT
Bread Financial
BFH
$4.26B
| $3.81M | ﹤0.01% |
44,607
+1,253
| +3% | +$96.8K |
|
1447
CALL
Reliance Steel & Aluminium
RS
$20.4B
| $3.81M | ﹤0.01% |
24,900
| – | – |
|
1448
PUT
Ocugen
OCGN
$461M
| $3.8M | ﹤0.01% |
485,900
+7,000
| +1% | +$51.4K |
|
1449
CALL
ScottsMiracle-Gro
SMG
$3.46B
| $3.8M | ﹤0.01% |
19,900
| – | – |
|
1450
PUT
Alcon
ALC
$34.1B
| $3.8M | ﹤0.01% |
54,000
| – | – |
|
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 84 new positions and exited 267, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 84 new positions and closed 267 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.