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 | |
|---|---|---|---|---|---|---|
1701
CALL
Equity Residential
EQR
$25.4B
| $2.92M | ﹤0.01% |
37,400
-100
| -0.3% | -$8.26K |
|
|
CTLT
1702
CALL
DELISTED
CATALENT, INC.
CTLT
| $2.92M | ﹤0.01% |
26,300
+200
| +0.8% | +$25K |
|
1703
New Oriental
EDU
$7.84B
| $2.91M | ﹤0.01% |
37,294
+259
| +0.7% | +$8.22K |
|
1704
CALL
ACI Worldwide
ACIW
$5.72B
| $2.91M | ﹤0.01% |
77,600
| – | – |
|
1705
CALL
VeriSign
VRSN
$25.3B
| $2.91M | ﹤0.01% |
12,700
| – | – |
|
|
MOMO
1706
CALL
Hello Group
MOMO
$869M
| $2.91M | ﹤0.01% |
190,200
+2,900
| +2% | +$36.3K |
|
1707
CALL
Jefferies Financial Group
JEF
$12.9B
| $2.91M | ﹤0.01% |
89,851
+1,150
| +1% | +$38.5K |
|
|
MRO
1708
DELISTED
Marathon Oil Corporation
MRO
| $2.9M | ﹤0.01% |
204,863
+36,247
| +21% | +$437K |
|
1709
PUT
Cooper Companies
COO
$13.7B
| $2.9M | ﹤0.01% |
28,800
| – | – |
|
1710
CALL
Travelers Companies
TRV
$80.8B
| $2.9M | ﹤0.01% |
19,100
-6,700
| -26% | -$1.04M |
|
1711
HubSpot
HUBS
$10.5B
| $2.9M | ﹤0.01% |
4,946
+80
| +2% | +$51.5K |
|
1712
PUT
Canadian Natural Resources
CNQ
$96.9B
| $2.9M | ﹤0.01% |
160,501
+204
| +0.1% | +$3.36K |
|
|
GBIO
1713
PUT
DELISTED
Generation Bio
GBIO
| $2.9M | ﹤0.01% |
10,560
| – | – |
|
|
VXRT
1714
CALL
DELISTED
Vaxart
VXRT
| $2.89M | ﹤0.01% |
376,700
+24,600
| +7% | +$202K |
|
1715
CALL
ZTO Express
ZTO
$18.2B
| $2.89M | ﹤0.01% |
97,100
| – | – |
|
1716
CALL
Digital Realty Trust
DLR
$73.7B
| $2.89M | ﹤0.01% |
19,300
-1,900
| -9% | -$298K |
|
|
MNDT
1717
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $2.89M | ﹤0.01% |
143,305
-2,541
| -2% | -$48.2K |
|
|
SOS
1718
CALL
SOS Limited
SOS
$18.2M
| $2.89M | ﹤0.01% |
1,189
+26
| +2% | +$52.2K |
|
1719
Tractor Supply
TSCO
$16.3B
| $2.89M | ﹤0.01% |
76,920
+1,040
| +1% | +$40.3K |
|
1720
CALL
WIX.com
WIX
$2.15B
| $2.89M | ﹤0.01% |
9,900
+100
| +1% | +$24.8K |
|
|
BNY
1721
CALL
Bank of New York Mellon
BNY
$108B
| $2.88M | ﹤0.01% |
56,100
+300
| +0.5% | +$15.6K |
|
1722
Nutrien
NTR
$32.7B
| $2.88M | ﹤0.01% |
46,853
+2,296
| +5% | +$140K |
|
|
PLL
1723
PUT
DELISTED
Piedmont Lithium
PLL
| $2.88M | ﹤0.01% |
37,500
-100
| -0.3% | -$5.81K |
|
1724
PUT
Baxter International
BAX
$11.6B
| $2.88M | ﹤0.01% |
35,300
+100
| +0.3% | +$7.9K |
|
1725
CALL
Tower Semiconductor
TSEM
$26.4B
| $2.87M | ﹤0.01% |
97,600
| – | – |
|
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.