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 | |
|---|---|---|---|---|---|---|
5751
PUT
Arcturus Therapeutics
ARCT
$164M
| $56K | ﹤0.01% |
3,300
+1,300
| +65% | +$24.5K |
|
5752
PUT
Crinetics Pharmaceuticals
CRNX
$8.84B
| $56K | ﹤0.01% |
1,100
+600
| +120% | +$33.6K |
|
5753
PUT
Deluxe
DLX
$1.18B
| $56K | ﹤0.01% |
2,500
-800
| -24% | -$17.2K |
|
5754
PUT
Gildan
GIL
$10.3B
| $56K | ﹤0.01% |
+1,200
| New | +$57.8K |
|
5755
CALL
Grocery Outlet
GO
$909M
| $56K | ﹤0.01% |
3,600
-38,700
| -91% | -$673K |
|
5756
ONE Gas
OGS
$4.87B
| $56K | ﹤0.01% |
814
+393
| +93% | +$28.7K |
|
5757
CALL
Phunware
PHUN
$43.1M
| $56K | ﹤0.01% |
+156,500
| New | +$864K |
|
5758
CALL
PRA Group
PRAA
$663M
| $56K | ﹤0.01% |
2,700
-5,500
| -67% | -$117K |
|
5759
CALL
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.52B
| $56K | ﹤0.01% |
300
-300
| -50% | -$58.4K |
|
|
REE
5760
DELISTED
REE Automotive
REE
| $56K | ﹤0.01% |
6,413
+5,008
| +356% | +$40.1K |
|
5761
PUT
Ryanair
RYAAY
$30.4B
| $56K | ﹤0.01% |
+1,300
| New | +$58K |
|
5762
CALL
Worthington Enterprises
WOR
$2.75B
| $56K | ﹤0.01% |
1,400
+1,000
| +250% | +$40.5K |
|
5763
Global X S&P 500 Covered Call ETF
XYLD
$3.24B
| $56K | ﹤0.01% |
+1,353
| New | +$56.8K |
|
|
MRX
5764
PUT
Marex Group Limited Ordinary Shares
MRX
$4.67B
| $56K | ﹤0.01% |
1,800
+800
| +80% | +$22.4K |
|
|
CMRX
5765
CALL
DELISTED
Chimerix, Inc.
CMRX
| $56K | ﹤0.01% |
16,300
+14,400
| +758% | +$20.3K |
|
5766
VanEck BDC Income ETF
BIZD
$1.59B
| $55K | ﹤0.01% |
3,352
-3,016
| -47% | -$49.7K |
|
|
BLD
5767
DELISTED
TopBuild
BLD
| $55K | ﹤0.01% |
178
-93
| -34% | -$34.1K |
|
5768
CALL
Bioventus
BVS
$892M
| $55K | ﹤0.01% |
5,300
-8,500
| -62% | -$101K |
|
5769
CALL
Torrid Holdings
CURV
$254M
| $55K | ﹤0.01% |
10,600
-82,200
| -89% | -$331K |
|
5770
PUT
Cousins Properties
CUZ
$5.19B
| $55K | ﹤0.01% |
1,800
-1,400
| -44% | -$42.9K |
|
5771
CALL
Diodes
DIOD
$3.78B
| $55K | ﹤0.01% |
900
+500
| +125% | +$31.2K |
|
5772
CALL
Domo
DOMO
$174M
| $55K | ﹤0.01% |
7,900
+5,800
| +276% | +$46.9K |
|
5773
PUT
Energizer
ENR
$1.44B
| $55K | ﹤0.01% |
1,600
-13,000
| -89% | -$450K |
|
|
FOLD
5774
CALL
DELISTED
Amicus Therapeutics
FOLD
| $55K | ﹤0.01% |
5,900
+1,400
| +31% | +$14.6K |
|
5775
CALL
Global Partners
GLP
$1.68B
| $55K | ﹤0.01% |
1,200
-3,900
| -76% | -$193K |
|
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.