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 | |
|---|---|---|---|---|---|---|
76
CALL
NIO
NIO
$12B
| $173M | 0.16% |
3,395,900
+49,900
| +1% | +$2.05M |
|
77
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $170M | 0.16% |
1,906,600
+42,300
| +2% | +$6.77M |
|
78
CALL
Citigroup
C
$223B
| $166M | 0.16% |
2,341,500
-49,300
| -2% | -$3.45M |
|
|
PARA
79
CALL
DELISTED
Paramount Global Class B
PARA
| $166M | 0.15% |
3,684,600
+246,800
| +7% | +$10.1M |
|
80
PUT
FedEx
FDX
$75.2B
| $165M | 0.15% |
550,000
+9,900
| +2% | +$2.69M |
|
81
PUT
Goldman Sachs
GS
$320B
| $163M | 0.15% |
435,400
+7,600
| +2% | +$2.97M |
|
82
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $162M | 0.15% |
2,061,800
+163,000
| +9% | +$10.7M |
|
83
CALL
Nike
NKE
$63.7B
| $161M | 0.15% |
1,016,300
-5,600
| -0.5% | -$913K |
|
84
CALL
JD.com
JD
$41.1B
| $160M | 0.15% |
2,067,900
+6,700
| +0.3% | +$494K |
|
85
PUT
Bank of America
BAC
$430B
| $159M | 0.15% |
3,826,900
+106,900
| +3% | +$4.31M |
|
86
PUT
Walmart Inc
WMT
$878B
| $157M | 0.15% |
3,376,800
+105,600
| +3% | +$5.09M |
|
87
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $157M | 0.15% |
3,745,700
+302,100
| +9% | +$7.8M |
|
88
PUT
Intel
INTC
$530B
| $155M | 0.15% |
2,773,600
+106,200
| +4% | +$5.76M |
|
89
PUT
Chipotle Mexican Grill
CMG
$42.7B
| $153M | 0.14% |
4,985,000
+115,000
| +2% | +$4.18M |
|
90
CALL
Qualcomm
QCOM
$183B
| $153M | 0.14% |
1,087,500
+35,000
| +3% | +$4.97M |
|
|
UWC
91
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $150M | 0.14% |
1,238,500
+94,400
| +8% | +$11.5M |
|
92
PUT
Moderna
MRNA
$23.7B
| $144M | 0.13% |
611,100
+43,400
| +8% | +$16M |
|
93
CALL
Adobe
ADBE
$90.3B
| $143M | 0.13% |
244,500
+7,100
| +3% | +$4.47M |
|
94
CALL
Zoom
ZM
$26.3B
| $141M | 0.13% |
364,700
+8,500
| +2% | +$2.87M |
|
95
CALL
Costco
COST
$412B
| $141M | 0.13% |
357,200
+22,500
| +7% | +$9.89M |
|
96
PUT
Broadcom
AVGO
$1.84T
| $141M | 0.13% |
2,994,000
+73,000
| +2% | +$3.55M |
|
97
PUT
Airbnb
ABNB
$85.5B
| $140M | 0.13% |
914,700
+92,300
| +11% | +$14.1M |
|
98
PUT
Coinbase
COIN
$46.3B
| $137M | 0.13% |
569,000
+6,100
| +1% | +$1.5M |
|
|
TWTR
99
CALL
DELISTED
Twitter, Inc.
TWTR
| $135M | 0.13% |
1,984,600
+29,400
| +2% | +$1.93M |
|
100
PUT
Target
TGT
$62.9B
| $132M | 0.12% |
540,800
+38,500
| +8% | +$9.64M |
|
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.