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 | |
|---|---|---|---|---|---|---|
1351
CALL
Vistra
VST
$55.1B
| $4.22M | ﹤0.01% |
223,800
-400
| -0.2% | -$7.39K |
|
1352
PUT
Nasdaq
NDAQ
$52.1B
| $4.22M | ﹤0.01% |
72,000
+9,000
| +14% | +$566K |
|
|
WRK
1353
PUT
DELISTED
WestRock Company
WRK
| $4.22M | ﹤0.01% |
79,200
| – | – |
|
1354
PUT
GSK
GSK
$103B
| $4.22M | ﹤0.01% |
84,000
+3,760
| +5% | +$189K |
|
1355
PUT
Affirm
AFRM
$23.5B
| $4.21M | ﹤0.01% |
61,600
+200
| +0.3% | +$16K |
|
|
JKS
1356
CALL
JinkoSolar
JKS
$775M
| $4.21M | ﹤0.01% |
80,800
+2,300
| +3% | +$116K |
|
|
LEV
1357
CALL
DELISTED
The Lion Electric Company
LEV
| $4.21M | ﹤0.01% |
215,100
-2,600
| -1% | -$36.3K |
|
1358
C3.ai
AI
$1.27B
| $4.2M | ﹤0.01% |
65,843
+10,169
| +18% | +$517K |
|
|
ABMD
1359
CALL
DELISTED
Abiomed Inc
ABMD
| $4.19M | ﹤0.01% |
13,400
| – | – |
|
|
TIGR
1360
UP Fintech Holding
TIGR
$845M
| $4.19M | ﹤0.01% |
159,985
+41,000
| +34% | +$643K |
|
|
VISN
1361
PUT
Vistance Networks Inc
VISN
$2.66B
| $4.18M | ﹤0.01% |
190,800
-200
| -0.1% | -$3.44K |
|
1362
CALL
ACM Research
ACMR
$5.83B
| $4.18M | ﹤0.01% |
123,000
| – | – |
|
1363
CALL
Cognizant
CTSH
$21.5B
| $4.18M | ﹤0.01% |
59,800
| – | – |
|
1364
Honeywell
HON
$77B
| $4.17M | ﹤0.01% |
20,060
+1,501
| +8% | +$320K |
|
1365
CALL
MP Materials
MP
$7.35B
| $4.16M | ﹤0.01% |
110,400
-400
| -0.4% | -$13.9K |
|
|
CMRC
1366
Commerce.com Inc Series 1
CMRC
$224M
| $4.16M | ﹤0.01% |
64,039
+14,800
| +30% | +$902K |
|
1367
Dow Inc
DOW
$21.6B
| $4.15M | ﹤0.01% |
65,398
-114
| -0.2% | -$6.98K |
|
1368
PUT
GDS Holdings
GDS
$6.34B
| $4.15M | ﹤0.01% |
54,700
| – | – |
|
1369
PUT
Stellantis
STLA
$16.5B
| $4.15M | ﹤0.01% |
209,100
| – | – |
|
1370
Broadcom
AVGO
$1.82T
| $4.14M | ﹤0.01% |
88,240
+9,020
| +11% | +$439K |
|
|
MRO
1371
CALL
DELISTED
Marathon Oil Corporation
MRO
| $4.14M | ﹤0.01% |
291,900
-80,600
| -22% | -$972K |
|
1372
CALL
BioCryst Pharmaceuticals
BCRX
$2.37B
| $4.13M | ﹤0.01% |
253,600
+11,800
| +5% | +$186K |
|
|
YALA
1373
PUT
Yalla Group
YALA
$786M
| $4.13M | ﹤0.01% |
218,900
-1,100
| -0.5% | -$12.8K |
|
1374
PUT
Realty Income
O
$61.2B
| $4.11M | ﹤0.01% |
63,262
+5,264
| +9% | +$355K |
|
1375
CALL
Alaska Air
ALK
$5.15B
| $4.11M | ﹤0.01% |
66,900
+700
| +1% | +$40.3K |
|
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.