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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5451
Runway Growth Finance
RWAY
$232M
| $75K | ﹤0.01% |
6,918
+969
| +16% | +$10.1K |
|
5452
Amplify Junior Silver Miners ETF
SILJ
$3.18B
| $75K | ﹤0.01% |
7,595
-44,124
| -85% | -$554K |
|
5453
CALL
SLR Investment Corp
SLRC
$686M
| $75K | ﹤0.01% |
4,700
+3,300
| +236% | +$52.4K |
|
5454
10x Genomics
TXG
$6B
| $75K | ﹤0.01% |
5,224
+2,055
| +65% | +$32.4K |
|
5455
PUT
Upland Software
UPLD
$12.8M
| $75K | ﹤0.01% |
1,750
+1,450
| +483% | +$47K |
|
|
GRAL
5456
GRAIL Inc
GRAL
$2.94B
| $75K | ﹤0.01% |
+4,209
| New | +$68.4K |
|
|
LLYX
5457
Defiance Daily Target 2x Long LLY ETF
LLYX
$54.5M
| $75K | ﹤0.01% |
+4,165
| New | +$90.1K |
|
5458
CALL
Backblaze
BLZE
$823M
| $74K | ﹤0.01% |
12,300
+7,000
| +132% | +$47.5K |
|
5459
Bentley Systems
BSY
$10.8B
| $74K | ﹤0.01% |
+1,595
| New | +$77.8K |
|
5460
PUT
Clean Energy Fuels
CLNE
$427M
| $74K | ﹤0.01% |
29,800
+6,100
| +26% | +$17.3K |
|
5461
PUT
iShares Core Dividend ETF
DIVB
$1.69B
| $74K | ﹤0.01% |
1,600
+1,000
| +167% | +$49.1K |
|
5462
PUT
Eagle Materials
EXP
$6.29B
| $74K | ﹤0.01% |
300
-8,500
| -97% | -$2.45M |
|
5463
CALL
First Trust Exchange-Traded Fund VI Multi-Asset Diversified Income Index Fund
MDIV
$429M
| $74K | ﹤0.01% |
1,000
-900
| -47% | -$14.9K |
|
5464
Invesco Water Resources ETF
PHO
$2.01B
| $74K | ﹤0.01% |
1,134
+1,121
| +8,623% | +$78.2K |
|
5465
CALL
First Trust Nasdaq-100 Select Equal Weight ETF
QQEW
$1.75B
| $74K | ﹤0.01% |
+600
| New | +$76.9K |
|
5466
CALL
SGHC Ltd
SGHC
$7.11B
| $74K | ﹤0.01% |
12,000
-7,300
| -38% | -$39K |
|
5467
PUT
SelectQuote
SLQT
$132M
| $74K | ﹤0.01% |
19,900
+19,100
| +2,388% | +$48.7K |
|
5468
PUT
Sasol
SSL
$7.5B
| $74K | ﹤0.01% |
16,400
+11,700
| +249% | +$66.1K |
|
5469
PUT
Trustmark
TRMK
$2.76B
| $74K | ﹤0.01% |
+2,100
| New | +$75.8K |
|
|
ACCD
5470
DELISTED
Accolade Inc
ACCD
| $74K | ﹤0.01% |
21,896
+12,305
| +128% | +$43.7K |
|
5471
Arteris
AIP
$1.38B
| $73K | ﹤0.01% |
+7,234
| New | +$59.8K |
|
5472
CALL
AirSculpt Technologies
AIRS
$339M
| $73K | ﹤0.01% |
+14,200
| New | +$87.2K |
|
5473
PUT
Amylyx Pharmaceuticals
AMLX
$2.26B
| $73K | ﹤0.01% |
19,400
-221,500
| -92% | -$1.04M |
|
5474
Certara
CERT
$1.26B
| $73K | ﹤0.01% |
6,888
+5,736
| +498% | +$62.3K |
|
|
CKPT
5475
PUT
DELISTED
Checkpoint Therapeutics
CKPT
| $73K | ﹤0.01% |
22,900
+17,900
| +358% | +$60.7K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.