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 | |
|---|---|---|---|---|---|---|
|
EXPR
2451
DELISTED
Express, Inc.
EXPR
| $1.6M | ﹤0.01% |
11,759
+743
| +7% | +$81.8K |
|
2452
CALL
Ingredion
INGR
$6.38B
| $1.6M | ﹤0.01% |
17,600
+5,800
| +49% | +$511K |
|
|
AHT
2453
Ashford Hospitality Trust
AHT
$21M
| $1.6M | ﹤0.01% |
37,045
+33,597
| +974% | +$5.69M |
|
2454
Credit Acceptance
CACC
$6B
| $1.6M | ﹤0.01% |
3,534
| – | – |
|
|
GOOS
2455
Canada Goose Holdings
GOOS
$868M
| $1.6M | ﹤0.01% |
36,108
-1,415
| -4% | -$56.4K |
|
2456
PUT
Pembina Pipeline
PBA
$29.9B
| $1.6M | ﹤0.01% |
49,800
| – | – |
|
2457
CALL
Fluor
FLR
$7.29B
| $1.6M | ﹤0.01% |
90,600
+9,900
| +12% | +$163K |
|
2458
CALL
Iridium Communications
IRDM
$4.85B
| $1.6M | ﹤0.01% |
39,500
+100
| +0.3% | +$4.2K |
|
2459
CALL
Synaptics
SYNA
$4.41B
| $1.6M | ﹤0.01% |
10,400
-100
| -1% | -$16.8K |
|
2460
CALL
Black Stone Minerals
BSM
$3.11B
| $1.59M | ﹤0.01% |
145,200
-200
| -0.1% | -$2.12K |
|
2461
CALL
Helmerich & Payne
HP
$3.53B
| $1.59M | ﹤0.01% |
47,800
+800
| +2% | +$22.3K |
|
|
CVM.WS
2462
PUT
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $1.59M | ﹤0.01% |
184,500
-4,100
| -2% | -$35.4K |
|
|
NOVA
2463
PUT
DELISTED
Sunnova Energy
NOVA
| $1.59M | ﹤0.01% |
42,400
+1,600
| +4% | +$56.5K |
|
2464
CALL
Terex
TEX
$7.98B
| $1.59M | ﹤0.01% |
33,600
| – | – |
|
|
KC
2465
Kingsoft Cloud Holdings
KC
$2.84B
| $1.59M | ﹤0.01% |
46,352
-3,525
| -7% | -$105K |
|
2466
PUT
uniQure
QURE
$2.68B
| $1.59M | ﹤0.01% |
50,800
| – | – |
|
|
VISN
2467
Vistance Networks Inc
VISN
$2.66B
| $1.58M | ﹤0.01% |
72,377
-800
| -1% | -$13.7K |
|
2468
PUT
Robert Half
RHI
$3.61B
| $1.58M | ﹤0.01% |
17,700
-100
| -0.6% | -$9.79K |
|
2469
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $1.58M | ﹤0.01% |
34,200
| – | – |
|
|
LOTZ
2470
CALL
DELISTED
CarLotz, Inc. Class A Common Stock
LOTZ
| $1.58M | ﹤0.01% |
298,200
-500
| -0.2% | -$2.16K |
|
2471
CALL
BlackLine
BL
$1.69B
| $1.58M | ﹤0.01% |
14,100
| – | – |
|
|
CTLP
2472
PUT
DELISTED
Cantaloupe
CTLP
| $1.58M | ﹤0.01% |
129,900
| – | – |
|
2473
8x8 Inc
EGHT
$247M
| $1.58M | ﹤0.01% |
57,257
| – | – |
|
2474
PUT
Ternium
TX
$9.29B
| $1.58M | ﹤0.01% |
40,600
| – | – |
|
2475
Cigna
CI
$76.6B
| $1.57M | ﹤0.01% |
6,612
+380
| +6% | +$82.6K |
|
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.