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 | |
|---|---|---|---|---|---|---|
|
HDSN
5326
CALL
Hudson Technologies
HDSN
$249M
| $79K | ﹤0.01% |
6,000
-7,900
| -57% | -$85.3K |
|
5327
iShares Self-Driving EV and Tech ETF
IDRV
$125M
| $79K | ﹤0.01% |
+2,126
| New | +$86.5K |
|
|
JFIN
5328
PUT
Jiayin Group
JFIN
$114M
| $79K | ﹤0.01% |
14,800
+7,000
| +90% | +$39.8K |
|
5329
KraneShares Global Carbon Strategy ETF
KRBN
$139M
| $79K | ﹤0.01% |
2,208
-1,474
| -40% | -$55.7K |
|
|
LADR
5330
CALL
Ladder Capital
LADR
$1.21B
| $79K | ﹤0.01% |
7,700
-13,800
| -64% | -$149K |
|
5331
CALL
908 Devices
MASS
$321M
| $79K | ﹤0.01% |
12,000
+11,700
| +3,900% | +$81K |
|
5332
PUT
Matsons
MATX
$6.13B
| $79K | ﹤0.01% |
900
+800
| +800% | +$69.9K |
|
|
SF
5333
CALL
Stifel
SF
$12.6B
| $79K | ﹤0.01% |
1,950
-13,200
| -87% | -$556K |
|
5334
CALL
Sotera Health
SHC
$5.02B
| $79K | ﹤0.01% |
5,300
-5,000
| -49% | -$84.4K |
|
5335
Steris
STE
$22.3B
| $79K | ﹤0.01% |
+362
| New | +$81.9K |
|
|
SVM
5336
Silvercorp Metals
SVM
$2.05B
| $79K | ﹤0.01% |
34,011
+264
| +0.8% | +$716 |
|
5337
U-Haul Holding Co
UHAL
$13.7B
| $79K | ﹤0.01% |
1,455
+657
| +82% | +$38.2K |
|
5338
Select Water Solutions
WTTR
$2.31B
| $79K | ﹤0.01% |
+10,040
| New | +$82.5K |
|
|
5339
PUT
Select Water Solutions
WTTR
$2.31B
| $79K | ﹤0.01% |
10,000
+3,200
| +47% | +$26.3K |
|
|
SQSP
5340
DELISTED
Squarespace, Inc.
SQSP
| $79K | ﹤0.01% |
+2,750
| New | +$84.4K |
|
|
YELL
5341
CALL
DELISTED
Yellow Corporation Common Stock
YELL
| $79K | ﹤0.01% |
56,400
+51,100
| +964% | +$79.7K |
|
5342
PUT
Clene
CLNN
$66.6M
| $78K | ﹤0.01% |
7,945
-535
| -6% | -$7.41K |
|
5343
PUT
Dragonfly Energy
DFLI
$14.6M
| $78K | ﹤0.01% |
569
+495
| +669% | +$87K |
|
5344
CALL
Harmonic Inc
HLIT
$1.24B
| $78K | ﹤0.01% |
8,200
+2,800
| +52% | +$33.4K |
|
5345
CALL
Holley
HLLY
$315M
| $78K | ﹤0.01% |
+15,800
| New | +$89.5K |
|
|
MCHB
5346
CALL
Mechanics Bancorp
MCHB
$3.68B
| $78K | ﹤0.01% |
10,100
-4,900
| -33% | -$43.5K |
|
5347
PUT
HUB Group
HUBG
$2.83B
| $78K | ﹤0.01% |
+2,000
| New | +$82K |
|
5348
CALL
LifeMD
LFMD
$167M
| $78K | ﹤0.01% |
12,500
+9,700
| +346% | +$42K |
|
5349
Lightwave Logic
LWLG
$971M
| $78K | ﹤0.01% |
17,571
+7,078
| +67% | +$45.2K |
|
5350
CALL
Malibu Boats
MBUU
$537M
| $78K | ﹤0.01% |
1,600
+500
| +45% | +$26.9K |
|
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.