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 | |
|---|---|---|---|---|---|---|
2476
CALL
Celldex Therapeutics
CLDX
$2.77B
| $1.23M | ﹤0.01% |
44,600
+38,200
| +597% | +$1.2M |
|
2477
CALL
Viatris
VTRS
$20.1B
| $1.23M | ﹤0.01% |
124,500
-92,000
| -42% | -$958K |
|
2478
CALL
Boot Barn
BOOT
$4.55B
| $1.23M | ﹤0.01% |
15,100
-46,900
| -76% | -$4.22M |
|
2479
Target Hospitality
TH
$1.61B
| $1.23M | ﹤0.01% |
77,159
+51,290
| +198% | +$723K |
|
|
MORF
2480
CALL
DELISTED
Morphic Holding, Inc. Common Stock
MORF
| $1.23M | ﹤0.01% |
53,500
+51,000
| +2,040% | +$2.68M |
|
2481
CALL
Fortive
FTV
$19B
| $1.22M | ﹤0.01% |
21,896
+3,451
| +19% | +$198K |
|
2482
CALL
Paysafe
PSFE
$407M
| $1.22M | ﹤0.01% |
101,800
+6,800
| +7% | +$82.8K |
|
2483
CALL
Tecnoglass
TGLS
$2.01B
| $1.22M | ﹤0.01% |
37,000
+34,900
| +1,662% | +$1.43M |
|
2484
United States Oil Fund
USO
$2.45B
| $1.22M | ﹤0.01% |
15,083
-19,460
| -56% | -$1.43M |
|
2485
Golar LNG
GLNG
$4.95B
| $1.22M | ﹤0.01% |
50,210
+43,769
| +680% | +$1.01M |
|
2486
CALL
Sylvamo
SLVM
$1.52B
| $1.22M | ﹤0.01% |
27,700
+26,500
| +2,208% | +$1.14M |
|
2487
PUT
Marriott Vacations Worldwide
VAC
$3.24B
| $1.22M | ﹤0.01% |
12,100
+4,600
| +61% | +$525K |
|
2488
CALL
Woodward
WWD
$25B
| $1.22M | ﹤0.01% |
+9,800
| New | +$1.22M |
|
2489
PUT
Ardelyx
ARDX
$1.24B
| $1.22M | ﹤0.01% |
298,000
+110,800
| +59% | +$432K |
|
2490
PUT
Hewlett Packard
HPE
$63.2B
| $1.22M | ﹤0.01% |
70,000
+10,200
| +17% | +$175K |
|
2491
PUT
Jones Lang LaSalle
JLL
$15.1B
| $1.21M | ﹤0.01% |
8,600
+5,700
| +197% | +$931K |
|
2492
Alnylam Pharmaceuticals
ALNY
$36.3B
| $1.21M | ﹤0.01% |
+6,845
| New | +$1.31M |
|
2493
PUT
United States Copper Index Fund
CPER
$742M
| $1.21M | ﹤0.01% |
52,600
+8,600
| +20% | +$201K |
|
2494
CALL
Carpenter Technology
CRS
$30B
| $1.21M | ﹤0.01% |
18,000
+13,700
| +319% | +$830K |
|
2495
Zions Bancorporation
ZION
$10.1B
| $1.21M | ﹤0.01% |
+34,660
| New | +$1.21M |
|
2496
PUT
Grab
GRAB
$13.5B
| $1.21M | ﹤0.01% |
341,200
-56,200
| -14% | -$201K |
|
|
LNW
2497
CALL
DELISTED
Light & Wonder
LNW
| $1.21M | ﹤0.01% |
16,900
+4,200
| +33% | +$305K |
|
2498
CALL
Designer Brands
DBI
$277M
| $1.2M | ﹤0.01% |
95,100
+81,300
| +589% | +$868K |
|
2499
PUT
Neurocrine Biosciences
NBIX
$17.7B
| $1.2M | ﹤0.01% |
10,700
-1,100
| -9% | -$116K |
|
2500
PUT
ArcBest
ARCB
$3.44B
| $1.2M | ﹤0.01% |
11,800
+11,300
| +2,260% | +$1.19M |
|
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.