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 | |
|---|---|---|---|---|---|---|
|
MRSH
1326
Marsh
MRSH
$86.2B
| $4.32M | ﹤0.01% |
30,377
+1,725
| +6% | +$261K |
|
|
RDFN
1327
CALL
DELISTED
Redfin
RDFN
| $4.31M | ﹤0.01% |
66,800
-6,200
| -8% | -$335K |
|
1328
CALL
Pan American Silver
PAAS
$18.6B
| $4.31M | ﹤0.01% |
151,800
+3,900
| +3% | +$102K |
|
1329
CALL
Hasbro
HAS
$12.6B
| $4.3M | ﹤0.01% |
45,100
+500
| +1% | +$48.6K |
|
1330
PUT
Wheaton Precious Metals
WPM
$50.6B
| $4.3M | ﹤0.01% |
97,700
-600
| -0.6% | -$26.2K |
|
1331
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $4.29M | ﹤0.01% |
50,900
| – | – |
|
1332
PUT
Illinois Tool Works
ITW
$81.4B
| $4.29M | ﹤0.01% |
19,100
| – | – |
|
1333
PUT
Restaurant Brands International
QSR
$25.2B
| $4.29M | ﹤0.01% |
65,800
+100
| +0.2% | +$6.41K |
|
1334
PUT
Thor Industries
THO
$3.99B
| $4.29M | ﹤0.01% |
36,900
-1,800
| -5% | -$205K |
|
1335
Sunrun
RUN
$2.38B
| $4.28M | ﹤0.01% |
76,223
+1,175
| +2% | +$56.1K |
|
1336
PUT
Mettler-Toledo International
MTD
$26.8B
| $4.28M | ﹤0.01% |
3,100
| – | – |
|
|
WLL
1337
PUT
DELISTED
Whiting Petroleum Corporation
WLL
| $4.28M | ﹤0.01% |
116,900
+300
| +0.3% | +$14.8K |
|
1338
PUT
Antero Resources
AR
$10.9B
| $4.27M | ﹤0.01% |
283,400
+200
| +0.1% | +$2.92K |
|
1339
CALL
Fox Class B
FOX
$20.8B
| $4.26M | ﹤0.01% |
113,400
| – | – |
|
1340
CALL
Entegris
ENTG
$19.7B
| $4.25M | ﹤0.01% |
35,900
-300
| -0.8% | -$36.2K |
|
1341
CALL
Lincoln National
LNC
$7.91B
| $4.25M | ﹤0.01% |
66,100
| – | – |
|
1342
PUT
AGNC Investment
AGNC
$12.3B
| $4.25M | ﹤0.01% |
250,000
+1,000
| +0.4% | +$16.2K |
|
1343
PUT
ZTO Express
ZTO
$18.3B
| $4.25M | ﹤0.01% |
142,600
+100
| +0.1% | +$2.87K |
|
1344
CALL
Nano X Imaging
NNOX
$62.3M
| $4.24M | ﹤0.01% |
133,700
+6,300
| +5% | +$165K |
|
1345
PUT
Winnebago Industries
WGO
$870M
| $4.24M | ﹤0.01% |
60,200
+100
| +0.2% | +$6.99K |
|
1346
PUT
T. Rowe Price
TROW
$25B
| $4.24M | ﹤0.01% |
21,200
+2,500
| +13% | +$526K |
|
1347
PUT
State Street
STT
$50.9B
| $4.23M | ﹤0.01% |
50,500
+100
| +0.2% | +$8.7K |
|
1348
GameStop
GME
$9.5B
| $4.23M | ﹤0.01% |
82,816
-13,408
| -14% | -$613K |
|
1349
Cloudflare
NET
$93.1B
| $4.23M | ﹤0.01% |
40,516
-1,094
| -3% | -$131K |
|
1350
CALL
Check Point Software Technologies
CHKP
$13.3B
| $4.22M | ﹤0.01% |
36,200
| – | – |
|
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.