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 | |
|---|---|---|---|---|---|---|
4701
RXO
RXO
$3.68B
| $165K | ﹤0.01% |
6,934
-4,360
| -39% | -$122K |
|
|
YALA
4702
Yalla Group
YALA
$814M
| $165K | ﹤0.01% |
40,742
-26,257
| -39% | -$113K |
|
4703
PUT
Bio-Rad Laboratories Class A
BIO
$8.76B
| $164K | ﹤0.01% |
+500
| New | +$170K |
|
|
DAO
4704
CALL
Youdao
DAO
$1.89B
| $164K | ﹤0.01% |
+22,200
| New | +$129K |
|
4705
Quest Diagnostics
DGX
$26B
| $164K | ﹤0.01% |
+1,088
| New | +$169K |
|
4706
FIVE9
FIVN
$2.08B
| $164K | ﹤0.01% |
+4,060
| New | +$146K |
|
|
GRRR
4707
PUT
Gorilla Technology Group
GRRR
$296M
| $164K | ﹤0.01% |
+9,100
| New | +$59.8K |
|
4708
iShares Russell 2000 Growth ETF
IWO
$14.1B
| $164K | ﹤0.01% |
+572
| New | +$169K |
|
|
MAG
4709
PUT
DELISTED
MAG Silver
MAG
| $164K | ﹤0.01% |
12,100
+3,000
| +33% | +$46.6K |
|
4710
PUT
TD Synnex
SNX
$19.9B
| $164K | ﹤0.01% |
1,400
-23,000
| -94% | -$2.75M |
|
4711
PUT
SELLAS Life Sciences
SLS
$1.99B
| $163K | ﹤0.01% |
+157,400
| New | +$180K |
|
4712
CALL
TORM
TRMD
$3.05B
| $163K | ﹤0.01% |
8,400
+3,500
| +71% | +$85.4K |
|
4713
PUT
West Pharmaceutical
WST
$23.7B
| $163K | ﹤0.01% |
500
-300
| -38% | -$94.4K |
|
|
SDIG
4714
DELISTED
Stronghold Digital Mining, Inc. Class A Common Stock
SDIG
| $163K | ﹤0.01% |
+46,766
| New | +$223K |
|
4715
CALL
Arbutus Biopharma
ABUS
$847M
| $162K | ﹤0.01% |
49,800
+26,000
| +109% | +$95.6K |
|
4716
AtaiBeckley Inc
ATAI
$2.66B
| $162K | ﹤0.01% |
121,984
+120,356
| +7,393% | +$160K |
|
4717
PUT
PDF Solutions
PDFS
$1.72B
| $162K | ﹤0.01% |
+6,000
| New | +$181K |
|
|
SAND
4718
PUT
DELISTED
Sandstorm Gold
SAND
| $162K | ﹤0.01% |
29,100
+3,500
| +14% | +$20.3K |
|
4719
CALL
Titan Machinery
TITN
$420M
| $162K | ﹤0.01% |
11,500
+3,400
| +42% | +$49.2K |
|
4720
CALL
Harmony Biosciences
HRMY
$2.08B
| $161K | ﹤0.01% |
4,700
+3,000
| +176% | +$103K |
|
4721
MannKind Corp
MNKD
$1.19B
| $161K | ﹤0.01% |
25,116
+14,310
| +132% | +$95.9K |
|
4722
Direxion Daily Dow Jones Internet Bull 3X ETF
WEBL
$85.4M
| $161K | ﹤0.01% |
6,032
+2,794
| +86% | +$68.8K |
|
4723
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.33B
| $161K | ﹤0.01% |
2,347
+1,577
| +205% | +$118K |
|
4724
PUT
Eversource Energy
ES
$28.1B
| $160K | ﹤0.01% |
2,800
-6,900
| -71% | -$430K |
|
4725
CALL
LGI Homes
LGIH
$1.35B
| $160K | ﹤0.01% |
1,800
-300
| -14% | -$31.5K |
|
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.