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 | |
|---|---|---|---|---|---|---|
5876
CALL
Babcock & Wilcox
BW
$1.39B
| $49K | ﹤0.01% |
30,400
+12,300
| +68% | +$26K |
|
|
CCRN
5877
PUT
DELISTED
Cross Country Healthcare
CCRN
| $49K | ﹤0.01% |
+2,700
| New | +$36.4K |
|
5878
Direxion Daily Real Estate Bull 3X ETF
DRN
$45.7M
| $49K | ﹤0.01% |
5,064
-10,494
| -67% | -$125K |
|
5879
Editas Medicine
EDIT
$396M
| $49K | ﹤0.01% |
38,642
-12,734
| -25% | -$32.4K |
|
5880
Fulcrum Therapeutics
FULC
$273M
| $49K | ﹤0.01% |
10,455
-39,309
| -79% | -$145K |
|
|
ILPT
5881
Industrial Logistics Properties Trust
ILPT
$575M
| $49K | ﹤0.01% |
13,636
+4,739
| +53% | +$18.3K |
|
5882
Martin Midstream Partners
MMLP
$95.5M
| $49K | ﹤0.01% |
13,746
+2,684
| +24% | +$10.6K |
|
5883
Merit Medical Systems
MMSI
$5.08B
| $49K | ﹤0.01% |
+510
| New | +$50.8K |
|
5884
PUT
Mine Safety
MSA
$7.35B
| $49K | ﹤0.01% |
300
-1,000
| -77% | -$171K |
|
5885
PUT
The RMR Group
RMR
$325M
| $49K | ﹤0.01% |
2,400
+1,800
| +300% | +$41.7K |
|
|
SAFE
5886
CALL
Safehold
SAFE
$1.16B
| $49K | ﹤0.01% |
2,700
-43,500
| -94% | -$945K |
|
5887
PUT
Safe Bulkers
SB
$795M
| $49K | ﹤0.01% |
14,000
-23,900
| -63% | -$99.8K |
|
5888
Sabra Healthcare REIT
SBRA
$5.34B
| $49K | ﹤0.01% |
+2,839
| New | +$51.8K |
|
5889
CALL
Senseonics Holdings Inc
SENS
$263M
| $49K | ﹤0.01% |
4,730
-245
| -5% | -$1.75K |
|
5890
Solid Biosciences
SLDB
$794M
| $49K | ﹤0.01% |
12,260
-10,185
| -45% | -$55.9K |
|
5891
PUT
Suburban Propane Partners
SPH
$1.24B
| $49K | ﹤0.01% |
2,900
+1,700
| +142% | +$31.3K |
|
5892
SPX Corp
SPXC
$11B
| $49K | ﹤0.01% |
+337
| New | +$54.4K |
|
5893
ReposiTrak
TRAK
$153M
| $49K | ﹤0.01% |
2,239
+1,217
| +119% | +$25.8K |
|
5894
Utz Brands
UTZ
$1.25B
| $49K | ﹤0.01% |
3,165
+780
| +33% | +$13.2K |
|
5895
CALL
Wintrust Financial
WTFC
$10.8B
| $49K | ﹤0.01% |
+400
| New | +$49.4K |
|
5896
CALL
Arbe Robotics
ARBE
$80.3M
| $48K | ﹤0.01% |
25,900
+1,100
| +4% | +$2K |
|
5897
Blue Bird Corp
BLBD
$2.35B
| $48K | ﹤0.01% |
1,250
-4,470
| -78% | -$187K |
|
5898
PUT
Vanguard Total Bond Market
BND
$157B
| $48K | ﹤0.01% |
700
-3,200
| -82% | -$234K |
|
5899
PUT
Chesapeake Utilities
CPK
$3.19B
| $48K | ﹤0.01% |
400
| – | – |
|
5900
CALL
Danaos Corp
DAC
$2.58B
| $48K | ﹤0.01% |
600
-6,500
| -92% | -$535K |
|
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.