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 | |
|---|---|---|---|---|---|---|
5926
Inovio Pharmaceuticals
INO
$55.7M
| $47K | ﹤0.01% |
25,793
+16,122
| +167% | +$71.4K |
|
5927
PUT
Maravai LifeSciences
MRVI
$969M
| $47K | ﹤0.01% |
8,800
-300
| -3% | -$1.93K |
|
|
MSB
5928
CALL
Mesabi Trust
MSB
$289M
| $47K | ﹤0.01% |
1,700
+100
| +6% | +$2.6K |
|
5929
CALL
MGIC Investment
MTG
$6.16B
| $47K | ﹤0.01% |
2,000
-41,500
| -95% | -$1.04M |
|
5930
CALL
NBT Bancorp
NBTB
$2.74B
| $47K | ﹤0.01% |
1,000
-800
| -44% | -$38.1K |
|
5931
PUT
NovaGold Resources
NG
$2.56B
| $47K | ﹤0.01% |
14,400
+3,400
| +31% | +$12K |
|
5932
PUT
Oaktree Specialty Lending
OCSL
$1.02B
| $47K | ﹤0.01% |
3,100
-14,500
| -82% | -$232K |
|
5933
CALL
Ormat Technologies
ORA
$6B
| $47K | ﹤0.01% |
700
-43,400
| -98% | -$3.35M |
|
5934
Virtus InfraCap US Preferred Stock ETF
PFFA
$2.45B
| $47K | ﹤0.01% |
2,147
+112
| +6% | +$2.53K |
|
5935
PUT
Prime Medicine
PRME
$527M
| $47K | ﹤0.01% |
+16,100
| New | +$56.5K |
|
5936
CALL
Relmada Therapeutics
RLMD
$557M
| $47K | ﹤0.01% |
91,400
+55,300
| +153% | +$135K |
|
5937
Schwab International Dividend Equity ETF
SCHY
$2.5B
| $47K | ﹤0.01% |
2,036
+1,980
| +3,536% | +$48.5K |
|
5938
CALL
Service Corp International
SCI
$11.7B
| $47K | ﹤0.01% |
600
-5,400
| -90% | -$442K |
|
5939
Sera Prognostics
SERA
$79.9M
| $47K | ﹤0.01% |
5,787
+5,705
| +6,957% | +$41.9K |
|
5940
Simply Good Foods
SMPL
$901M
| $47K | ﹤0.01% |
1,210
-3,359
| -74% | -$123K |
|
|
TRVG
5941
trivago
TRVG
$373M
| $47K | ﹤0.01% |
+21,874
| New | +$42.2K |
|
5942
Vishay Intertechnology
VSH
$5.25B
| $47K | ﹤0.01% |
2,813
+825
| +41% | +$14.5K |
|
5943
CALL
VistaGen Therapeutics
VTGN
$9.89M
| $47K | ﹤0.01% |
16,100
-6,800
| -30% | -$19.1K |
|
5944
VirTra
VTSI
$34.9M
| $47K | ﹤0.01% |
7,014
-6,406
| -48% | -$43.2K |
|
5945
PUT
NCR Voyix
VYX
$1.14B
| $47K | ﹤0.01% |
4,100
-2,400
| -37% | -$33.3K |
|
5946
CALL
Wabash National
WNC
$512M
| $47K | ﹤0.01% |
2,800
+2,700
| +2,700% | +$50.1K |
|
|
ZH
5947
Zhihu
ZH
$281M
| $47K | ﹤0.01% |
13,422
+12,701
| +1,762% | +$47.1K |
|
5948
ProShares UltraShort Bitcoin ETF
SBIT
$172M
| $47K | ﹤0.01% |
+801
| New | +$76.9K |
|
|
ATYR
5949
aTyr Pharma
ATYR
$47.6M
| $47K | ﹤0.01% |
13,161
+12,371
| +1,566% | +$37.5K |
|
|
AEVA
5950
Aeva Technologies
AEVA
$1.2B
| $46K | ﹤0.01% |
+9,708
| New | +$39.3K |
|
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.