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 | |
|---|---|---|---|---|---|---|
1826
MongoDB
MDB
$24B
| $2.6M | ﹤0.01% |
7,274
-435
| -6% | -$175K |
|
|
SPWR
1827
PUT
DELISTED
SunPower Corporation Common Stock
SPWR
| $2.6M | ﹤0.01% |
92,500
+2,400
| +3% | +$56.1K |
|
1828
PUT
Arbor Realty Trust
ABR
$960M
| $2.6M | ﹤0.01% |
143,600
| – | – |
|
1829
PUT
Sibanye-Stillwater
SBSW
$5.92B
| $2.6M | ﹤0.01% |
153,700
-100
| -0.1% | -$1.56K |
|
|
TTCF
1830
CALL
DELISTED
Tattooed Chef, Inc Class A Common Stock
TTCF
| $2.6M | ﹤0.01% |
121,300
+3,700
| +3% | +$73.2K |
|
1831
Carvana
CVNA
$43.3B
| $2.59M | ﹤0.01% |
42,125
+7,250
| +21% | +$482K |
|
1832
PUT
Vulcan Materials
VMC
$36.3B
| $2.59M | ﹤0.01% |
14,900
| – | – |
|
1833
CALL
Aramark
ARMK
$15B
| $2.59M | ﹤0.01% |
96,812
-1,523
| -2% | -$37.7K |
|
1834
PUT
BioCryst Pharmaceuticals
BCRX
$2.37B
| $2.59M | ﹤0.01% |
159,100
+13,700
| +9% | +$216K |
|
1835
PUT
Cognizant
CTSH
$21.5B
| $2.58M | ﹤0.01% |
37,000
| – | – |
|
1836
Buckle
BKE
$2.19B
| $2.58M | ﹤0.01% |
51,491
+2,344
| +5% | +$100K |
|
|
HIMX
1837
Himax Technologies
HIMX
$2.2B
| $2.58M | ﹤0.01% |
162,171
+4,928
| +3% | +$63.2K |
|
1838
CALL
Schrodinger
SDGR
$1.12B
| $2.58M | ﹤0.01% |
33,700
+400
| +1% | +$25.6K |
|
1839
CALL
Bruker
BRKR
$9.2B
| $2.57M | ﹤0.01% |
33,600
| – | – |
|
1840
PUT
Kimbell Royalty Partners
KRP
$1.47B
| $2.57M | ﹤0.01% |
196,300
| – | – |
|
1841
PUT
Rockwell Automation
ROK
$51.4B
| $2.57M | ﹤0.01% |
9,000
| – | – |
|
1842
CALL
Teradata
TDC
$2.68B
| $2.57M | ﹤0.01% |
52,300
+700
| +1% | +$36.1K |
|
1843
PUT
Ambarella
AMBA
$2.99B
| $2.56M | ﹤0.01% |
24,200
+100
| +0.4% | +$11.5K |
|
1844
CALL
Procure Space ETF
UFO
$620M
| $2.56M | ﹤0.01% |
82,500
| – | – |
|
1845
CALL
Illinois Tool Works
ITW
$81.4B
| $2.56M | ﹤0.01% |
11,400
-200
| -2% | -$45.1K |
|
1846
PUT
DigitalBridge
DBRG
$2.94B
| $2.56M | ﹤0.01% |
80,375
-30,250
| -27% | -$834K |
|
1847
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $2.56M | ﹤0.01% |
29,100
-600
| -2% | -$51.5K |
|
1848
FTAI Aviation
FTAI
$22.2B
| $2.56M | ﹤0.01% |
89,729
| – | – |
|
1849
Melco Resorts & Entertainment
MLCO
$2.1B
| $2.56M | ﹤0.01% |
152,827
+4,346
| +3% | +$57.2K |
|
1850
CALL
Spectrum Brands
SPB
$2.04B
| $2.55M | ﹤0.01% |
30,600
| – | – |
|
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.