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 | |
|---|---|---|---|---|---|---|
|
SEI
6826
PUT
Solaris Energy Infrastructure
SEI
$2.66B
| $17K | ﹤0.01% |
600
+500
| +500% | +$9.94K |
|
|
WDTE
6827
Defiance S&P 500 Weekly Distribution ETF
WDTE
$65.1M
| $17K | ﹤0.01% |
+456
| New | +$18.8K |
|
6828
PUT
AbCellera Biologics
ABCL
$1.65B
| $16K | ﹤0.01% |
5,700
-28,600
| -83% | -$79.6K |
|
6829
Acco Brands
ACCO
$399M
| $16K | ﹤0.01% |
3,077
+2,774
| +916% | +$15.4K |
|
6830
Aclaris Therapeutics
ACRS
$715M
| $16K | ﹤0.01% |
6,695
+5,610
| +517% | +$14K |
|
6831
PUT
Agios Pharmaceuticals
AGIO
$2.08B
| $16K | ﹤0.01% |
500
-2,000
| -80% | -$94K |
|
6832
PUT
Alta Equipment Group
ALTG
$194M
| $16K | ﹤0.01% |
2,500
-32,200
| -93% | -$224K |
|
6833
CALL
Anika Therapeutics
ANIK
$215M
| $16K | ﹤0.01% |
+1,000
| New | +$19.7K |
|
6834
CALL
Compugen
CGEN
$212M
| $16K | ﹤0.01% |
10,700
+2,600
| +32% | +$4.23K |
|
6835
Traeger
COOK
$165M
| $16K | ﹤0.01% |
134
+105
| +362% | +$16.1K |
|
6836
Cheniere Energy
CQP
$30.5B
| $16K | ﹤0.01% |
+310
| New | +$16.2K |
|
6837
PUT
Corbus Pharmaceuticals
CRBP
$165M
| $16K | ﹤0.01% |
1,400
-2,900
| -67% | -$48.6K |
|
6838
CALL
iShares Core Dividend ETF
DIVB
$1.71B
| $16K | ﹤0.01% |
400
-600
| -60% | -$29.5K |
|
6839
CALL
DNOW Inc
DNOW
$2.44B
| $16K | ﹤0.01% |
+1,300
| New | +$17.5K |
|
6840
PUT
Dole
DOLE
$1.38B
| $16K | ﹤0.01% |
1,200
-1,000
| -45% | -$15.4K |
|
|
EARN
6841
PUT
Ellington Residential Mortgage REIT
EARN
$166M
| $16K | ﹤0.01% |
2,500
-1,600
| -39% | -$10.7K |
|
|
EB
6842
CALL
DELISTED
Eventbrite
EB
| $16K | ﹤0.01% |
4,800
-1,400
| -23% | -$4.64K |
|
|
EB
6843
DELISTED
Eventbrite
EB
| $16K | ﹤0.01% |
4,921
-6,040
| -55% | -$20K |
|
|
DMC
6844
CALL
Del Monte Corp
DMC
$1.42B
| $16K | ﹤0.01% |
500
-700
| -58% | -$22.5K |
|
|
GAU
6845
PUT
Galiano Gold
GAU
$457M
| $16K | ﹤0.01% |
+13,200
| New | +$19K |
|
6846
CALL
Getty Images
GETY
$159M
| $16K | ﹤0.01% |
7,700
-300
| -4% | -$979 |
|
6847
CALL
Graco
GGG
$13.2B
| $16K | ﹤0.01% |
200
-800
| -80% | -$69.3K |
|
6848
CALL
GH Research
GHRS
$1.92B
| $16K | ﹤0.01% |
2,400
+800
| +50% | +$6.43K |
|
6849
CALL
Grove Collaborative
GROV
$45.8M
| $16K | ﹤0.01% |
+11,900
| New | +$16.4K |
|
|
IMMP
6850
CALL
Immutep
IMMP
$56.1M
| $16K | ﹤0.01% |
7,700
-9,000
| -54% | -$18.1K |
|
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.