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 | |
|---|---|---|---|---|---|---|
1676
PUT
Arrow Electronics
ARW
$10.9B
| $2.98M | ﹤0.01% |
25,900
| – | – |
|
1677
CALL
Petco
WOOF
$745M
| $2.98M | ﹤0.01% |
136,800
+18,400
| +16% | +$388K |
|
1678
CALL
Inovio Pharmaceuticals
INO
$79.8M
| $2.98M | ﹤0.01% |
26,208
-25
| -0.1% | -$2.51K |
|
1679
CALL
Tapestry
TPR
$28.8B
| $2.96M | ﹤0.01% |
69,800
+300
| +0.4% | +$12.3K |
|
1680
CALL
Centene
CNC
$31.3B
| $2.96M | ﹤0.01% |
40,200
-100
| -0.2% | -$6.68K |
|
|
MUDS
1681
PUT
DELISTED
Mudrick Capital Acquisition Corporation II Class A Common Stock
MUDS
| $2.96M | ﹤0.01% |
239,000
+100
| +0% | +$1.05K |
|
1682
Uber
UBER
$134B
| $2.96M | ﹤0.01% |
58,474
+12,523
| +27% | +$547K |
|
1683
PUT
QuidelOrtho
QDEL
$1.09B
| $2.96M | ﹤0.01% |
23,000
+100
| +0.4% | +$13.4K |
|
1684
PUT
Emerson Electric
EMR
$82.9B
| $2.96M | ﹤0.01% |
30,500
+100
| +0.3% | +$9.98K |
|
1685
PUT
Toll Brothers
TOL
$14B
| $2.96M | ﹤0.01% |
50,200
+300
| +0.6% | +$17.7K |
|
1686
Bloom Energy
BE
$52.6B
| $2.96M | ﹤0.01% |
111,040
+129
| +0.1% | +$2.73K |
|
1687
CALL
GoDaddy
GDDY
$12.3B
| $2.95M | ﹤0.01% |
33,300
-700
| -2% | -$54.2K |
|
1688
PUT
CONMED
CNMD
$1.29B
| $2.94M | ﹤0.01% |
21,200
| – | – |
|
|
NVO
1689
Novo Nordisk
NVO
$216B
| $2.94M | ﹤0.01% |
69,634
-200
| -0.3% | -$9.67K |
|
|
EXPR
1690
PUT
DELISTED
Express, Inc.
EXPR
| $2.94M | ﹤0.01% |
21,540
+780
| +4% | +$85.8K |
|
1691
CALL
BioMarin Pharmaceuticals
BMRN
$11.5B
| $2.94M | ﹤0.01% |
35,000
| – | – |
|
1692
CALL
Zimmer Biomet
ZBH
$17.7B
| $2.94M | ﹤0.01% |
18,540
| – | – |
|
1693
CALL
Hydrofarm Holdings
HYFM
$3.13M
| $2.94M | ﹤0.01% |
5,190
+820
| +19% | +$398K |
|
1694
CALL
Yeti Holdings
YETI
$3.82B
| $2.93M | ﹤0.01% |
31,500
+700
| +2% | +$67.7K |
|
1695
Starbucks
SBUX
$118B
| $2.93M | ﹤0.01% |
25,868
+17,893
| +224% | +$2.09M |
|
|
MDP
1696
PUT
DELISTED
Meredith Corporation
MDP
| $2.93M | ﹤0.01% |
67,600
+1,000
| +2% | +$43.6K |
|
1697
CALL
Western Union
WU
$2.57B
| $2.92M | ﹤0.01% |
126,900
| – | – |
|
|
FUV
1698
CALL
DELISTED
Arcimoto, Inc. Common Stock
FUV
| $2.92M | ﹤0.01% |
9,395
+1,575
| +20% | +$428K |
|
1699
CALL
AST SpaceMobile
ASTS
$16.8B
| $2.92M | ﹤0.01% |
225,600
-800
| -0.4% | -$8.98K |
|
1700
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.35B
| $2.92M | ﹤0.01% |
72,741
-2,300
| -3% | -$88.8K |
|
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.