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 | |
|---|---|---|---|---|---|---|
1651
CALL
Evercore
EVR
$11.4B
| $3.05M | ﹤0.01% |
21,500
| – | – |
|
1652
PUT
BlueLinx
BXC
$637M
| $3.05M | ﹤0.01% |
62,400
-300
| -0.5% | -$15.1K |
|
1653
Parker-Hannifin
PH
$121B
| $3.04M | ﹤0.01% |
9,920
+100
| +1% | +$29.8K |
|
|
WCN
1654
CALL
Waste Connections
WCN
$41.1B
| $3.04M | ﹤0.01% |
25,400
| – | – |
|
1655
PUT
Moody's
MCO
$83.4B
| $3.03M | ﹤0.01% |
8,300
| – | – |
|
1656
PUT
Paysafe
PSFE
$336M
| $3.03M | ﹤0.01% |
21,425
+783
| +4% | +$89.7K |
|
1657
CALL
Corteva
CTVA
$57.9B
| $3.02M | ﹤0.01% |
67,800
| – | – |
|
1658
CALL
HP
HPQ
$28.2B
| $3.02M | ﹤0.01% |
99,600
-600
| -0.6% | -$17.2K |
|
1659
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$301M
| $3.02M | ﹤0.01% |
160,694
+2,800
| +2% | +$49.1K |
|
|
SI
1660
PUT
DELISTED
Silvergate Capital Corporation
SI
| $3.02M | ﹤0.01% |
27,600
-1,300
| -4% | -$139K |
|
1661
PUT
UWM Holdings
UWMC
$2.34B
| $3.02M | ﹤0.01% |
367,600
+6,900
| +2% | +$51.4K |
|
1662
PUT
SAP
SAP
$243B
| $3.02M | ﹤0.01% |
21,500
+100
| +0.5% | +$14.5K |
|
1663
PUT
Iron Mountain
IRM
$35.5B
| $3.02M | ﹤0.01% |
70,800
+1,000
| +1% | +$45K |
|
1664
PUT
Sturm, Ruger & Co
RGR
$612M
| $3.02M | ﹤0.01% |
33,900
+2,700
| +9% | +$210K |
|
1665
CALL
Ollie's Bargain Outlet
OLLI
$4.53B
| $3.01M | ﹤0.01% |
35,300
| – | – |
|
1666
PUT
Northern Trust
NTRS
$33.9B
| $3.01M | ﹤0.01% |
25,900
+200
| +0.8% | +$22.7K |
|
1667
PUT
PPG Industries
PPG
$24.6B
| $3.01M | ﹤0.01% |
17,700
-700
| -4% | -$112K |
|
1668
PUT
United Natural Foods
UNFI
$2.73B
| $3.01M | ﹤0.01% |
81,500
| – | – |
|
1669
PUT
Scotiabank
BNS
$114B
| $3M | ﹤0.01% |
45,800
| – | – |
|
1670
Dell
DELL
$339B
| $3M | ﹤0.01% |
59,944
-2,235
| -4% | -$111K |
|
|
HBI
1671
CALL
DELISTED
Hanesbrands
HBI
| $3M | ﹤0.01% |
159,500
-400
| -0.3% | -$7.5K |
|
1672
CALL
PVH
PVH
$3.32B
| $2.99M | ﹤0.01% |
27,200
-2,200
| -7% | -$237K |
|
1673
PUT
Sarepta Therapeutics
SRPT
$2.14B
| $2.99M | ﹤0.01% |
38,200
| – | – |
|
1674
CALL
XPEL
XPEL
$1.38B
| $2.99M | ﹤0.01% |
34,400
+300
| +0.9% | +$24.7K |
|
1675
Merck
MRK
$368B
| $2.98M | ﹤0.01% |
38,216
+4,436
| +13% | +$337K |
|
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.