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 | |
|---|---|---|---|---|---|---|
1951
PUT
Element Solutions
ESI
$9.12B
| $2.36M | ﹤0.01% |
99,200
| – | – |
|
|
CAI
1952
PUT
DELISTED
CAI International, Inc.
CAI
| $2.36M | ﹤0.01% |
42,300
| – | – |
|
1953
CALL
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $2.35M | ﹤0.01% |
29,600
+4,200
| +17% | +$257K |
|
1954
PUT
Wendy's
WEN
$1.33B
| $2.35M | ﹤0.01% |
101,500
-800
| -0.8% | -$18.2K |
|
1955
PUT
Brookfield Renewable
BEPC
$6.12B
| $2.35M | ﹤0.01% |
56,200
| – | – |
|
1956
CALL
Cencora
COR
$60.3B
| $2.35M | ﹤0.01% |
20,200
-100
| -0.5% | -$12K |
|
1957
PUT
MillerKnoll
MLKN
$1.5B
| $2.35M | ﹤0.01% |
48,400
-100
| -0.2% | -$4.29K |
|
1958
PUT
Invesco Mortgage Capital
IVR
$776M
| $2.35M | ﹤0.01% |
60,850
-460
| -0.8% | -$14.9K |
|
|
ARVL
1959
PUT
DELISTED
Arrival Ordinary Shares
ARVL
| $2.34M | ﹤0.01% |
3,008
+20
| +0.7% | +$12.8K |
|
1960
PUT
Bloomin' Brands
BLMN
$680M
| $2.34M | ﹤0.01% |
86,300
| – | – |
|
|
FSR
1961
PUT
DELISTED
Fisker Inc.
FSR
| $2.34M | ﹤0.01% |
127,200
-800
| -0.6% | -$12K |
|
|
ANSS
1962
CALL
DELISTED
Ansys
ANSS
| $2.34M | ﹤0.01% |
6,700
| – | – |
|
1963
Ball Corp
BALL
$17B
| $2.33M | ﹤0.01% |
28,250
+13,810
| +96% | +$1.23M |
|
1964
PUT
NCR Voyix
VYX
$1.06B
| $2.33M | ﹤0.01% |
81,989
| – | – |
|
|
AMED
1965
PUT
DELISTED
Amedisys
AMED
| $2.33M | ﹤0.01% |
8,900
| – | – |
|
1966
Pool Corp
POOL
$6.7B
| $2.32M | ﹤0.01% |
5,026
-2
| -0% | -$948 |
|
|
P
1967
CALL
Everpure Inc
P
$24.8B
| $2.32M | ﹤0.01% |
120,300
-1,400
| -1% | -$30.9K |
|
|
BNY
1968
PUT
Bank of New York Mellon
BNY
$108B
| $2.32M | ﹤0.01% |
45,100
+200
| +0.4% | +$10.4K |
|
1969
PUT
Inovio Pharmaceuticals
INO
$79.8M
| $2.32M | ﹤0.01% |
20,433
+41
| +0.2% | +$4.11K |
|
1970
CALL
Omnicell
OMCL
$1.86B
| $2.32M | ﹤0.01% |
15,600
+100
| +0.6% | +$15.3K |
|
|
NVTA
1971
CALL
DELISTED
Invitae Corporation
NVTA
| $2.32M | ﹤0.01% |
69,000
-2,000
| -3% | -$58.6K |
|
|
TWOU
1972
CALL
DELISTED
2U Inc
TWOU
| $2.31M | ﹤0.01% |
1,863
-134
| -7% | -$157K |
|
1973
Direxion Daily FTSE China Bull 3X ETF
YINN
$660M
| $2.31M | ﹤0.01% |
6,326
-5
| -0.1% | -$1.28K |
|
1974
PUT
Boston Properties
BXP
$11B
| $2.31M | ﹤0.01% |
20,100
| – | – |
|
|
ANSS
1975
PUT
DELISTED
Ansys
ANSS
| $2.3M | ﹤0.01% |
6,600
+400
| +6% | +$144K |
|
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.