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 | |
|---|---|---|---|---|---|---|
|
K
1801
CALL
DELISTED
Kellanova
K
| $2.66M | ﹤0.01% |
44,304
| – | – |
|
1802
PUT
National Beverage
FIZZ
$2.87B
| $2.65M | ﹤0.01% |
57,900
-600
| -1% | -$27.9K |
|
1803
CALL
OptimizeRx
OPRX
$117M
| $2.65M | ﹤0.01% |
44,900
-300
| -0.7% | -$18.8K |
|
1804
CALL
Trip.com Group
TCOM
$27.5B
| $2.65M | ﹤0.01% |
75,100
-6,700
| -8% | -$193K |
|
1805
PUT
Corning
GLW
$126B
| $2.65M | ﹤0.01% |
64,500
-1,700
| -3% | -$67.9K |
|
1806
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $2.65M | ﹤0.01% |
66,100
+300
| +0.5% | +$11.3K |
|
1807
CALL
Carlyle Group
CG
$16.3B
| $2.64M | ﹤0.01% |
56,800
| – | – |
|
1808
Ferrari
RACE
$63.3B
| $2.64M | ﹤0.01% |
12,992
-1,301
| -9% | -$279K |
|
|
RBAC
1809
CALL
DELISTED
RedBall Acquisition Corp.
RBAC
| $2.64M | ﹤0.01% |
270,700
| – | – |
|
1810
CALL
Boston Properties
BXP
$11B
| $2.64M | ﹤0.01% |
23,000
+100
| +0.4% | +$11.4K |
|
1811
PUT
Stanley Black & Decker
SWK
$14.2B
| $2.64M | ﹤0.01% |
12,800
+100
| +0.8% | +$19.5K |
|
1812
PUT
Anavex Life Sciences
AVXL
$222M
| $2.64M | ﹤0.01% |
107,400
+4,000
| +4% | +$79.6K |
|
1813
CALL
HubSpot
HUBS
$10.5B
| $2.64M | ﹤0.01% |
4,500
| – | – |
|
1814
PUT
Elanco Animal Health
ELAN
$12.4B
| $2.63M | ﹤0.01% |
75,200
| – | – |
|
|
DQ
1815
Daqo New Energy
DQ
$790M
| $2.63M | ﹤0.01% |
39,779
+493
| +1% | +$29.5K |
|
1816
PUT
Eaton
ETN
$157B
| $2.63M | ﹤0.01% |
17,500
-300
| -2% | -$47.9K |
|
1817
PUT
Academy Sports + Outdoors
ASO
$2.89B
| $2.62M | ﹤0.01% |
63,200
+2,100
| +3% | +$83.8K |
|
|
SGI
1818
Somnigroup International
SGI
$15.1B
| $2.62M | ﹤0.01% |
63,144
+17,259
| +38% | +$754K |
|
1819
PUT
Banco Bradesco
BBD
$38.1B
| $2.62M | ﹤0.01% |
575,797
-15,180
| -3% | -$60.5K |
|
1820
PUT
Cenovus Energy
CVE
$54.6B
| $2.61M | ﹤0.01% |
264,100
+28,300
| +12% | +$242K |
|
1821
CALL
Lithia Motors
LAD
$7.78B
| $2.61M | ﹤0.01% |
7,400
| – | – |
|
|
STOR
1822
CALL
DELISTED
STORE Capital Corporation
STOR
| $2.61M | ﹤0.01% |
73,300
-3,800
| -5% | -$135K |
|
1823
CALL
AvalonBay Communities
AVB
$27.1B
| $2.61M | ﹤0.01% |
12,400
-2,300
| -16% | -$516K |
|
1824
CALL
Ralph Lauren
RL
$22.2B
| $2.61M | ﹤0.01% |
22,100
| – | – |
|
|
KYNB
1825
CALL
Kyntra Bio
KYNB
$28.5M
| $2.61M | ﹤0.01% |
3,936
| – | – |
|
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.