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 | |
|---|---|---|---|---|---|---|
|
SRNE
1751
PUT
DELISTED
Sorrento Therapeutics, Inc.
SRNE
| $2.79M | ﹤0.01% |
254,000
+56,200
| +28% | +$477K |
|
1752
CALL
Nutrien
NTR
$32.7B
| $2.79M | ﹤0.01% |
45,400
-300
| -0.7% | -$18.3K |
|
1753
PUT
Martin Marietta Materials
MLM
$33.6B
| $2.78M | ﹤0.01% |
7,900
| – | – |
|
|
ORGN
1754
CALL
DELISTED
Origin Materials
ORGN
| $2.78M | ﹤0.01% |
11,130
+497
| +5% | +$102K |
|
|
NNDM
1755
Nano Dimension
NNDM
$309M
| $2.78M | ﹤0.01% |
347,123
-2,317
| -0.7% | -$14.6K |
|
1756
CALL
Arbor Realty Trust
ABR
$960M
| $2.77M | ﹤0.01% |
153,400
-200
| -0.1% | -$3.62K |
|
1757
PUT
Tootsie Roll Industries
TR
$2.82B
| $2.77M | ﹤0.01% |
95,554
-116
| -0.1% | -$3.27K |
|
1758
CALL
FIVE9
FIVN
$1.77B
| $2.77M | ﹤0.01% |
15,000
| – | – |
|
1759
CALL
Avantor
AVTR
$7.81B
| $2.76M | ﹤0.01% |
76,300
+10,400
| +16% | +$406K |
|
1760
PUT
HDFC Bank
HDB
$119B
| $2.76M | ﹤0.01% |
76,400
+200
| +0.3% | +$7.42K |
|
1761
CALL
Flowers Foods
FLO
$1.64B
| $2.76M | ﹤0.01% |
114,400
| – | – |
|
1762
PUT
RLX Technology
RLX
$2.48B
| $2.76M | ﹤0.01% |
314,600
-8,600
| -3% | -$46.7K |
|
1763
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.2B
| $2.76M | ﹤0.01% |
39,541
+200
| +0.5% | +$14.3K |
|
1764
PUT
Acuity Brands
AYI
$9.88B
| $2.75M | ﹤0.01% |
15,600
+1,100
| +8% | +$193K |
|
1765
CALL
International Flavors & Fragrances
IFF
$19.4B
| $2.75M | ﹤0.01% |
18,400
+400
| +2% | +$58.7K |
|
1766
CALL
Campbell Soup
CPB
$6.51B
| $2.75M | ﹤0.01% |
60,100
+200
| +0.3% | +$8.68K |
|
1767
Pfizer
PFE
$140B
| $2.75M | ﹤0.01% |
69,460
+15,114
| +28% | +$670K |
|
1768
Arrowhead Research
ARWR
$12.1B
| $2.75M | ﹤0.01% |
32,311
+4,415
| +16% | +$286K |
|
1769
PUT
PennyMac Financial
PFSI
$4.38B
| $2.74M | ﹤0.01% |
45,500
+2,800
| +7% | +$178K |
|
1770
CALL
e.l.f. Beauty
ELF
$4.56B
| $2.74M | ﹤0.01% |
100,900
-900
| -0.9% | -$25.8K |
|
1771
PUT
Yeti Holdings
YETI
$3.82B
| $2.74M | ﹤0.01% |
29,400
+2,000
| +7% | +$194K |
|
1772
CALL
Ventas
VTR
$48.9B
| $2.73M | ﹤0.01% |
55,600
+7,900
| +17% | +$453K |
|
|
CDK
1773
PUT
DELISTED
CDK Global, Inc.
CDK
| $2.73M | ﹤0.01% |
54,600
| – | – |
|
1774
KraneShares CSI China Internet ETF
KWEB
$5.2B
| $2.73M | ﹤0.01% |
39,981
-2,331
| -6% | -$122K |
|
1775
CALL
Lamar Advertising Co
LAMR
$16.2B
| $2.73M | ﹤0.01% |
26,000
| – | – |
|
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.