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 | |
|---|---|---|---|---|---|---|
1051
PUT
Huntington Ingalls Industries
HII
$11.3B
| $6.07M | 0.01% |
28,600
| – | – |
|
1052
PUT
Equinix
EQIX
$102B
| $6.06M | 0.01% |
7,600
| – | – |
|
1053
IBM
IBM
$194B
| $6.06M | 0.01% |
43,178
-12,060
| -22% | -$1.61M |
|
1054
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $6.04M | 0.01% |
12,200
+100
| +0.8% | +$49.1K |
|
1055
PUT
PVH
PVH
$3.59B
| $6.03M | 0.01% |
54,900
| – | – |
|
1056
FedEx
FDX
$74.7B
| $6M | 0.01% |
20,075
+2,554
| +15% | +$693K |
|
1057
CALL
Canadian Solar
CSIQ
$997M
| $5.98M | 0.01% |
137,000
+59,500
| +77% | +$2.26M |
|
1058
PUT
Camping World
CWH
$358M
| $5.98M | 0.01% |
144,500
+1,100
| +0.8% | +$43.2K |
|
1059
QuantumScape Corp
QS
$3.15B
| $5.97M | 0.01% |
215,702
+17,708
| +9% | +$404K |
|
1060
CALL
ChargePoint
CHPT
$140M
| $5.95M | 0.01% |
9,020
-35
| -0.4% | -$16.3K |
|
1061
PUT
Ralph Lauren
RL
$22.1B
| $5.95M | 0.01% |
50,400
+100
| +0.2% | +$11.6K |
|
1062
PUT
Equity Residential
EQR
$25.6B
| $5.94M | 0.01% |
76,100
| – | – |
|
|
PARA
1063
DELISTED
Paramount Global Class B
PARA
| $5.93M | 0.01% |
131,915
+14,931
| +13% | +$608K |
|
1064
CALL
O'Reilly Automotive
ORLY
$71.4B
| $5.93M | 0.01% |
154,500
-3,000
| -2% | -$120K |
|
|
IRBT
1065
PUT
DELISTED
iRobot
IRBT
| $5.91M | 0.01% |
65,300
+3,000
| +5% | +$256K |
|
|
SPR
1066
DELISTED
Spirit AeroSystems
SPR
| $5.88M | 0.01% |
123,396
+58
| +0% | +$2.43K |
|
1067
PUT
Franco-Nevada
FNV
$41.3B
| $5.87M | 0.01% |
40,400
| – | – |
|
1068
PUT
Crown Castle
CCI
$32.5B
| $5.86M | 0.01% |
30,100
+400
| +1% | +$77.3K |
|
|
MIC
1069
PUT
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $5.85M | 0.01% |
151,300
| – | – |
|
1070
PUT
Revolve Group
RVLV
$1.75B
| $5.85M | 0.01% |
82,400
+1,700
| +2% | +$111K |
|
1071
CALL
Zoetis
ZTS
$31.3B
| $5.85M | 0.01% |
30,900
| – | – |
|
1072
CALL
Welltower
WELL
$174B
| $5.84M | 0.01% |
69,800
-400
| -0.6% | -$34.4K |
|
1073
PUT
Azenta
AZTA
$1.3B
| $5.84M | 0.01% |
62,200
| – | – |
|
1074
CALL
Oneok
OKE
$58.7B
| $5.84M | 0.01% |
102,600
+3,300
| +3% | +$177K |
|
1075
CALL
AerCap
AER
$23.4B
| $5.83M | 0.01% |
112,200
+200
| +0.2% | +$10.7K |
|
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.