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 | |
|---|---|---|---|---|---|---|
801
CALL
United Rentals
URI
$71.4B
| $8.74M | 0.01% |
27,200
+2,200
| +9% | +$738K |
|
|
NKLA
802
CALL
DELISTED
Nikola Corporation Common Stock
NKLA
| $8.73M | 0.01% |
17,133
-20
| -0.1% | -$7K |
|
|
DFS
803
CALL
DELISTED
Discover Financial Services
DFS
| $8.72M | 0.01% |
72,900
+3,400
| +5% | +$426K |
|
804
PUT
Lithia Motors
LAD
$7.62B
| $8.72M | 0.01% |
24,700
+3,400
| +16% | +$1.18M |
|
805
CALL
Air Products & Chemicals
APD
$65.5B
| $8.66M | 0.01% |
30,000
+1,400
| +5% | +$387K |
|
806
CALL
CSX Corp
CSX
$98.1B
| $8.66M | 0.01% |
268,200
+47,700
| +22% | +$1.53M |
|
807
PUT
Teck Resources
TECK
$29.3B
| $8.65M | 0.01% |
379,600
-9,500
| -2% | -$218K |
|
|
JWN
808
CALL
DELISTED
Nordstrom
JWN
| $8.64M | 0.01% |
236,800
+55,900
| +31% | +$1.78M |
|
809
CALL
Fiverr
FVRR
$370M
| $8.64M | 0.01% |
36,000
+2,000
| +6% | +$403K |
|
810
CALL
Atossa Therapeutics
ATOS
$24M
| $8.64M | 0.01% |
90,007
+7,154
| +9% | +$416K |
|
811
PUT
Shake Shack
SHAK
$2.26B
| $8.63M | 0.01% |
83,100
| – | – |
|
812
PUT
Nokia
NOK
$54.3B
| $8.62M | 0.01% |
1,604,600
+100
| +0% | +$581 |
|
813
Fastly Inc
FSLY
$3.04B
| $8.6M | 0.01% |
148,166
-6,050
| -4% | -$279K |
|
814
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $8.57M | 0.01% |
347,300
+12,500
| +4% | +$1.24M |
|
815
CALL
PACCAR
PCAR
$68.8B
| $8.56M | 0.01% |
144,600
| – | – |
|
816
PUT
Avis
CAR
$5.62B
| $8.54M | 0.01% |
104,300
+900
| +0.9% | +$79.3K |
|
817
PUT
Cigna
CI
$75.7B
| $8.53M | 0.01% |
35,800
+400
| +1% | +$87K |
|
818
CALL
Paychex
PAYX
$39.4B
| $8.53M | 0.01% |
78,600
+2,000
| +3% | +$225K |
|
819
CALL
Microvision
MVIS
$96.4M
| $8.5M | 0.01% |
519,200
+11,000
| +2% | +$153K |
|
820
PUT
TransDigm Group
TDG
$67.9B
| $8.5M | 0.01% |
12,900
+100
| +0.8% | +$62.5K |
|
821
CALL
Elastic
ESTC
$5.96B
| $8.44M | 0.01% |
57,800
+19,200
| +50% | +$2.95M |
|
822
CALL
ON Semiconductor
ON
$35.1B
| $8.44M | 0.01% |
222,700
+3,700
| +2% | +$158K |
|
823
CALL
American Water Works
AWK
$26.2B
| $8.42M | 0.01% |
54,100
| – | – |
|
824
CALL
Wendy's
WEN
$1.37B
| $8.38M | 0.01% |
361,600
-8,300
| -2% | -$189K |
|
|
JMIA
825
CALL
Jumia Technologies
JMIA
$734M
| $8.38M | 0.01% |
292,400
+29,900
| +11% | +$632K |
|
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.