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 | |
|---|---|---|---|---|---|---|
51
PUT
Snap
SNAP
$7.67B
| $238M | 0.22% |
3,524,100
+335,900
| +11% | +$24.3M |
|
52
PUT
ARK Space & Defense Innovation ETF
ARKX
$823M
| $227M | 0.21% |
1,996,100
+79,900
| +4% | +$1.64M |
|
|
53
PUT
Micron Technology
MU
$1.1T
| $225M | 0.21% |
2,805,000
+270,500
| +11% | +$20.3M |
|
54
PUT
PayPal
PYPL
$49.3B
| $216M | 0.2% |
748,600
+43,400
| +6% | +$12.3M |
|
55
PUT
JPMorgan Chase
JPM
$918B
| $215M | 0.2% |
1,370,400
+79,700
| +6% | +$12.5M |
|
56
PUT
Adobe
ADBE
$90.3B
| $213M | 0.2% |
364,600
+61,400
| +20% | +$38.6M |
|
57
PUT
Shopify
SHOP
$160B
| $211M | 0.2% |
1,445,000
+67,000
| +5% | +$10M |
|
58
PUT
Citigroup
C
$223B
| $209M | 0.19% |
2,939,100
+24,100
| +0.8% | +$1.68M |
|
59
CALL
Intel
INTC
$530B
| $207M | 0.19% |
3,691,000
+55,300
| +2% | +$3M |
|
60
CALL
Visa
V
$677B
| $207M | 0.19% |
878,400
+3,500
| +0.4% | +$821K |
|
|
61
CALL
PayPal
PYPL
$49.3B
| $205M | 0.19% |
708,600
+56,600
| +9% | +$16.1M |
|
62
PUT
Roku
ROKU
$21.4B
| $202M | 0.19% |
463,200
+17,900
| +4% | +$6.75M |
|
63
PUT
Qualcomm
QCOM
$183B
| $201M | 0.19% |
1,430,800
+90,500
| +7% | +$12.8M |
|
64
CALL
GameStop
GME
$9.78B
| $200M | 0.19% |
3,910,400
+455,200
| +13% | +$20.8M |
|
|
65
CALL
Roku
ROKU
$21.4B
| $194M | 0.18% |
446,400
+39,300
| +10% | +$14.8M |
|
|
66
CALL
JPMorgan Chase
JPM
$918B
| $193M | 0.18% |
1,232,700
-203,200
| -14% | -$31.9M |
|
67
CALL
Mastercard
MA
$476B
| $190M | 0.18% |
511,300
+31,700
| +7% | +$11.5M |
|
|
68
CALL
Shopify
SHOP
$160B
| $189M | 0.18% |
1,296,000
+90,000
| +7% | +$13.5M |
|
69
PUT
Zoom
ZM
$26.3B
| $183M | 0.17% |
474,000
+7,700
| +2% | +$2.6M |
|
|
UWC
70
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $180M | 0.17% |
1,564,600
+53,600
| +4% | +$6.17M |
|
71
CALL
Airbnb
ABNB
$85.5B
| $180M | 0.17% |
1,172,600
+52,900
| +5% | +$8.08M |
|
|
72
PUT
Visa
V
$677B
| $178M | 0.17% |
758,500
+3,400
| +0.5% | +$797K |
|
73
CALL
FedEx
FDX
$75.2B
| $176M | 0.16% |
588,300
+2,600
| +0.4% | +$706K |
|
74
CALL
Walmart Inc
WMT
$878B
| $175M | 0.16% |
3,775,500
+177,000
| +5% | +$8.53M |
|
|
75
PUT
Mastercard
MA
$476B
| $173M | 0.16% |
466,600
+22,200
| +5% | +$8.07M |
|
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.