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 | Miscellaneous | 97.72% |
| 2 | Technology | 0.49% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.27% |
| 5 | Healthcare | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1376
CALL
Tyson Foods
TSN
$18.1B
| $4.1M | ﹤0.01% |
55,500
-400
| -0.7% | -$30.2K |
|
1377
CALL
Schwab US Broad Market ETF
SCHB
$44.8B
| $4.1M | ﹤0.01% |
322,200
-600
| -0.2% | -$10.7K |
|
|
RWT
1378
PUT
Redwood Trust
RWT
$567M
| $4.09M | ﹤0.01% |
337,700
| – | – |
|
1379
CALL
Amplify Online Retail ETF
IBUY
$125M
| $4.08M | ﹤0.01% |
84,800
| – | – |
|
1380
PUT
Dominion Energy
D
$57.9B
| $4.08M | ﹤0.01% |
55,000
+100
| +0.2% | +$7.63K |
|
1381
CALL
Plains All American Pipeline
PAA
$18.1B
| $4.08M | ﹤0.01% |
348,000
-28,100
| -7% | -$279K |
|
|
DQ
1382
CALL
Daqo New Energy
DQ
$833M
| $4.07M | ﹤0.01% |
61,600
+100
| +0.2% | +$5.99K |
|
1383
CALL
Agilent Technologies
A
$42.5B
| $4.06M | ﹤0.01% |
27,500
-300
| -1% | -$48.5K |
|
1384
CALL
Transocean
RIG
$6.53B
| $4.06M | ﹤0.01% |
820,800
+35,900
| +5% | +$131K |
|
1385
CALL
Service Corp International
SCI
$11.2B
| $4.06M | ﹤0.01% |
74,900
| – | – |
|
1386
CALL
Jazz Pharmaceuticals
JAZZ
$16B
| $4.06M | ﹤0.01% |
22,400
-300
| -1% | -$45.3K |
|
|
ME
1387
CALL
DELISTED
23andMe Holding Co
ME
| $4.05M | ﹤0.01% |
18,430
+225
| +1% | +$40K |
|
1388
Direxion Daily Energy Bull 2X ETF
ERX
$251M
| $4.05M | ﹤0.01% |
138,724
| – | – |
|
1389
Fair Isaac
FICO
$20.1B
| $4.05M | ﹤0.01% |
8,097
| – | – |
|
1390
PUT
Williams Companies
WMB
$90.7B
| $4.05M | ﹤0.01% |
151,100
| – | – |
|
1391
PUT
L3Harris
LHX
$47.8B
| $4.04M | ﹤0.01% |
18,500
| – | – |
|
1392
CALL
Rithm Capital
RITM
$5.63B
| $4.04M | ﹤0.01% |
384,600
+4,300
| +1% | +$44.2K |
|
1393
PUT
Revvity
RVTY
$14.5B
| $4.04M | ﹤0.01% |
26,100
+3,900
| +18% | +$687K |
|
|
SAVE
1394
CALL
DELISTED
Spirit Airlines, Inc.
SAVE
| $4.03M | ﹤0.01% |
128,900
+3,700
| +3% | +$97K |
|
1395
CALL
Lufax Holding
LU
$1.08B
| $4.03M | ﹤0.01% |
90,125
+950
| +1% | +$31.5K |
|
1396
CALL
Vornado Realty Trust
VNO
$6.83B
| $4.03M | ﹤0.01% |
85,600
| – | – |
|
|
CLR
1397
PUT
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $4.03M | ﹤0.01% |
100,900
+200
| +0.2% | +$7.55K |
|
1398
PUT
Scorpio Tankers
STNG
$4.12B
| $4.01M | ﹤0.01% |
185,800
+400
| +0.2% | +$6.67K |
|
1399
PUT
Southern Copper
SCCO
$168B
| $4.01M | ﹤0.01% |
69,320
-1,419
| -2% | -$81.2K |
|
1400
CALL
Albemarle
ALB
$14.9B
| $4.01M | ﹤0.01% |
23,300
+100
| +0.4% | +$21.4K |
|
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 84 new positions and exited 267, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 84 new positions and closed 267 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.