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 | |
|---|---|---|---|---|---|---|
|
STKL
2351
CALL
DELISTED
SunOpta
STKL
| $1.73M | ﹤0.01% |
141,200
| – | – |
|
|
CERN
2352
PUT
DELISTED
Cerner Corp
CERN
| $1.73M | ﹤0.01% |
22,000
+300
| +1% | +$23.2K |
|
|
LAC
2353
CALL
DELISTED
Lithium Americas Corp. Common Shares
LAC
| $1.73M | ﹤0.01% |
117,000
-1,400
| -1% | -$24.6K |
|
2354
Harley-Davidson
HOG
$2.68B
| $1.73M | ﹤0.01% |
36,725
-681
| -2% | -$27.5K |
|
2355
CALL
DaVita
DVA
$15.1B
| $1.72M | ﹤0.01% |
14,100
| – | – |
|
2356
CALL
Beam Therapeutics
BEAM
$2.58B
| $1.72M | ﹤0.01% |
12,900
-200
| -2% | -$20.1K |
|
2357
Nexstar Media Group
NXST
$5.6B
| $1.72M | ﹤0.01% |
11,374
+200
| +2% | +$29.5K |
|
|
AYX
2358
PUT
DELISTED
Alteryx Inc
AYX
| $1.72M | ﹤0.01% |
20,600
-3,700
| -15% | -$278K |
|
2359
iShares MSCI Japan ETF
EWJ
$21.7B
| $1.72M | ﹤0.01% |
25,497
-600
| -2% | -$41.5K |
|
|
BLUE
2360
PUT
DELISTED
bluebird bio
BLUE
| $1.72M | ﹤0.01% |
4,092
| – | – |
|
2361
PUT
Modine Manufacturing
MOD
$12.8B
| $1.72M | ﹤0.01% |
103,400
| – | – |
|
2362
CALL
Murphy Oil
MUR
$5.58B
| $1.72M | ﹤0.01% |
69,700
| – | – |
|
|
DNMR
2363
CALL
DELISTED
Danimer Scientific, Inc.
DNMR
| $1.72M | ﹤0.01% |
1,753
-67
| -4% | -$49.3K |
|
2364
PUT
Moelis & Co
MC
$4.98B
| $1.72M | ﹤0.01% |
30,100
| – | – |
|
|
CMA
2365
DELISTED
Comerica
CMA
| $1.71M | ﹤0.01% |
23,750
| – | – |
|
2366
PUT
FMC
FMC
$1.42B
| $1.71M | ﹤0.01% |
15,800
-100
| -0.6% | -$9.87K |
|
2367
PUT
Carrier Global
CARR
$57.2B
| $1.71M | ﹤0.01% |
35,100
| – | – |
|
2368
PUT
Varonis Systems
VRNS
$5.25B
| $1.71M | ﹤0.01% |
29,600
+1,600
| +6% | +$100K |
|
|
PLL
2369
CALL
DELISTED
Piedmont Lithium
PLL
| $1.71M | ﹤0.01% |
22,300
+100
| +0.5% | +$5.81K |
|
2370
Lightspeed Commerce
LSPD
$1.3B
| $1.71M | ﹤0.01% |
20,309
-279
| -1% | -$27.7K |
|
2371
Oneok
OKE
$58.7B
| $1.71M | ﹤0.01% |
30,035
-8,507
| -22% | -$457K |
|
2372
PUT
PagerDuty
PD
$700M
| $1.71M | ﹤0.01% |
40,300
-500
| -1% | -$21.2K |
|
2373
CALL
Zevra Therapeutics
ZVRA
$563M
| $1.71M | ﹤0.01% |
128,300
+900
| +0.7% | +$9.07K |
|
2374
PUT
Village Farms International
VFF
$235M
| $1.7M | ﹤0.01% |
158,000
-200
| -0.1% | -$1.87K |
|
2375
PUT
Magnite
MGNI
$2.65B
| $1.7M | ﹤0.01% |
49,100
+500
| +1% | +$15K |
|
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.