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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1451
PUT
Philips
PHG
$25.4B
| $4.36M | ﹤0.01% |
244,718
-43,152
| -15% | -$828K |
|
1452
Riot Platforms
RIOT
$8.52B
| $4.36M | ﹤0.01% |
467,747
+457,347
| +4,398% | +$6.3M |
|
1453
PUT
AGNC Investment
AGNC
$12.3B
| $4.36M | ﹤0.01% |
462,200
+65,900
| +17% | +$652K |
|
1454
PUT
Dynatrace
DT
$12.1B
| $4.36M | ﹤0.01% |
93,300
-25,700
| -22% | -$1.26M |
|
1455
CALL
Regions Financial
RF
$26.3B
| $4.36M | ﹤0.01% |
253,400
-95,900
| -27% | -$1.82M |
|
1456
PUT
Symbotic
SYM
$5.11B
| $4.36M | ﹤0.01% |
130,300
+89,400
| +219% | +$3.68M |
|
1457
CALL
Northern Oil and Gas
NOG
$2.3B
| $4.35M | ﹤0.01% |
108,100
-38,400
| -26% | -$1.51M |
|
1458
CALL
Range Resources
RRC
$9.11B
| $4.34M | ﹤0.01% |
134,000
-38,000
| -22% | -$1.19M |
|
|
DM
1459
PUT
DELISTED
Desktop Metal, Inc.
DM
| $4.34M | ﹤0.01% |
297,070
+24,380
| +9% | +$405K |
|
1460
CALL
Lattice Semiconductor
LSCC
$17.6B
| $4.33M | ﹤0.01% |
50,400
+43,700
| +652% | +$3.94M |
|
1461
PUT
Essential Utilities
WTRG
$11.2B
| $4.31M | ﹤0.01% |
125,600
+123,700
| +6,511% | +$4.79M |
|
|
NKLA
1462
CALL
DELISTED
Nikola Corporation Common Stock
NKLA
| $4.3M | ﹤0.01% |
91,317
+237
| +0.3% | +$12.3K |
|
|
ARCH
1463
CALL
DELISTED
Arch Resources, Inc.
ARCH
| $4.3M | ﹤0.01% |
25,200
+11,800
| +88% | +$1.58M |
|
1464
Las Vegas Sands
LVS
$30.5B
| $4.27M | ﹤0.01% |
+93,251
| New | +$5.04M |
|
1465
CALL
Duolingo
DUOL
$5.7B
| $4.25M | ﹤0.01% |
25,600
-13,300
| -34% | -$1.96M |
|
1466
PUT
Canadian Solar
CSIQ
$906M
| $4.23M | ﹤0.01% |
172,000
-10,100
| -6% | -$319K |
|
1467
CALL
Flex
FLEX
$43.4B
| $4.22M | ﹤0.01% |
207,808
-93,421
| -31% | -$1.89M |
|
1468
PUT
Xcel Energy
XEL
$51B
| $4.2M | ﹤0.01% |
73,400
+30,900
| +73% | +$1.86M |
|
1469
PUT
Factset
FDS
$9.05B
| $4.2M | ﹤0.01% |
9,600
+6,300
| +191% | +$2.68M |
|
1470
PUT
Ovintiv
OVV
$17.7B
| $4.2M | ﹤0.01% |
88,200
-24,700
| -22% | -$1.12M |
|
1471
CALL
Fox Class B
FOX
$20.7B
| $4.19M | ﹤0.01% |
134,400
-49,900
| -27% | -$1.53M |
|
|
SGI
1472
Somnigroup International
SGI
$15.1B
| $4.18M | ﹤0.01% |
+96,524
| New | +$4.28M |
|
1473
PUT
Mobileye
MBLY
$6.78B
| $4.18M | ﹤0.01% |
100,600
-115,600
| -53% | -$4.45M |
|
1474
CALL
Fluor
FLR
$7.29B
| $4.17M | ﹤0.01% |
113,700
+69,300
| +156% | +$2.32M |
|
1475
CALL
Exelixis
EXEL
$13.9B
| $4.17M | ﹤0.01% |
190,900
+35,700
| +23% | +$747K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.