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 | |
|---|---|---|---|---|---|---|
4276
PUT
Harmony Biosciences
HRMY
$2.02B
| $213K | ﹤0.01% |
6,500
+1,100
| +20% | +$38.2K |
|
|
JOYY
4277
PUT
JOYY Inc
JOYY
$3.7B
| $213K | ﹤0.01% |
5,600
+800
| +17% | +$27.7K |
|
4278
CALL
Brookfield Infrastructure
BIPC
$5.2B
| $212K | ﹤0.01% |
6,000
-31,800
| -84% | -$1.31M |
|
|
SLAI
4279
CALL
DELISTED
SOLAI Ltd ADS
SLAI
| $212K | ﹤0.01% |
11,014
+10,114
| +1,124% | +$223K |
|
4280
Fox Class B
FOX
$21.8B
| $212K | ﹤0.01% |
7,362
+5,214
| +243% | +$160K |
|
4281
iShares Preferred and Income Securities ETF
PFF
$13.3B
| $212K | ﹤0.01% |
7,050
+4,273
| +154% | +$131K |
|
4282
CALL
PROG Holdings
PRG
$1.71B
| $212K | ﹤0.01% |
+6,400
| New | +$223K |
|
4283
PUT
Urban Outfitters
URBN
$6.4B
| $212K | ﹤0.01% |
6,500
-14,900
| -70% | -$510K |
|
4284
PUT
Aldeyra Therapeutics
ALDX
$94.1M
| $211K | ﹤0.01% |
31,700
-45,300
| -59% | -$336K |
|
|
AZUL
4285
DELISTED
Azul
AZUL
| $211K | ﹤0.01% |
24,645
-5,126
| -17% | -$50.9K |
|
4286
CALL
BBVA Argentina
BBAR
$3.9B
| $211K | ﹤0.01% |
50,900
-24,200
| -32% | -$130K |
|
4287
Invesco Senior Loan ETF
BKLN
$6.97B
| $211K | ﹤0.01% |
10,087
-20,530
| -67% | -$432K |
|
4288
Bankunited
BKU
$3.35B
| $211K | ﹤0.01% |
+9,327
| New | +$239K |
|
4289
Commault Systems
CVLT
$4.78B
| $211K | ﹤0.01% |
3,129
-3,758
| -55% | -$266K |
|
4290
CALL
Genmab
GMAB
$17.7B
| $211K | ﹤0.01% |
6,000
+5,300
| +757% | +$202K |
|
4291
CALL
LCI Industries
LCII
$2.48B
| $211K | ﹤0.01% |
1,800
+1,500
| +500% | +$188K |
|
4292
Amplify Alternative Harvest ETF
MJ
$102M
| $211K | ﹤0.01% |
4,817
+1,058
| +28% | +$42.8K |
|
4293
CALL
Full Truck Alliance
YMM
$9.91B
| $211K | ﹤0.01% |
30,000
-15,600
| -34% | -$108K |
|
|
AMED
4294
DELISTED
Amedisys
AMED
| $210K | ﹤0.01% |
2,259
-779
| -26% | -$72K |
|
4295
Cardlytics
CDLX
$21.8M
| $210K | ﹤0.01% |
+1,276
| New | +$166K |
|
4296
CALL
Paymentus
PAY
$4.3B
| $210K | ﹤0.01% |
12,700
+12,300
| +3,075% | +$163K |
|
4297
PUT
GoodRx Holdings
GDRX
$1.04B
| $209K | ﹤0.01% |
37,200
-5,900
| -14% | -$39.3K |
|
4298
Halozyme
HALO
$9.79B
| $209K | ﹤0.01% |
5,485
+2,146
| +64% | +$87.9K |
|
4299
PUT
Hudbay
HBM
$10.1B
| $209K | ﹤0.01% |
43,000
+3,500
| +9% | +$17.7K |
|
4300
Lufax Holding
LU
$1.37B
| $209K | ﹤0.01% |
49,361
+21,608
| +78% | +$120K |
|
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.