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 | |
|---|---|---|---|---|---|---|
4851
CALL
Littelfuse
LFUS
$10.4B
| $141K | ﹤0.01% |
600
+500
| +500% | +$125K |
|
4852
Alliant Energy
LNT
$18.6B
| $141K | ﹤0.01% |
2,399
+1,742
| +265% | +$105K |
|
4853
PUT
PubMatic
PUBM
$608M
| $141K | ﹤0.01% |
9,600
-400
| -4% | -$6.2K |
|
4854
PUT
TETRA Technologies
TTI
$1.08B
| $141K | ﹤0.01% |
39,500
+6,000
| +18% | +$21.3K |
|
|
TGR
4855
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $141K | ﹤0.01% |
1,000
-700
| -41% | -$98.7K |
|
4856
CALL
Enovis
ENOV
$1.74B
| $140K | ﹤0.01% |
3,200
+1,900
| +146% | +$83.4K |
|
|
EU
4857
enCore Energy
EU
$206M
| $140K | ﹤0.01% |
41,306
+19,277
| +88% | +$72.6K |
|
4858
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$7.78B
| $140K | ﹤0.01% |
4,300
+500
| +13% | +$16.5K |
|
4859
CALL
Installed Building Products
IBP
$6.21B
| $140K | ﹤0.01% |
800
-3,000
| -79% | -$653K |
|
|
MRSN
4860
CALL
DELISTED
Mersana Therapeutics
MRSN
| $140K | ﹤0.01% |
3,940
-140
| -3% | -$7.24K |
|
4861
Nuvation Bio
NUVB
$2.29B
| $140K | ﹤0.01% |
52,737
+5,040
| +11% | +$13K |
|
|
NUVL
4862
PUT
DELISTED
Nuvalent
NUVL
| $140K | ﹤0.01% |
1,800
-20,200
| -92% | -$1.89M |
|
4863
PUT
Perdoceo Education
PRDO
$2.17B
| $140K | ﹤0.01% |
5,300
+100
| +2% | +$2.46K |
|
|
RDUS
4864
CALL
DELISTED
Radius Recycling
RDUS
| $140K | ﹤0.01% |
9,200
+2,700
| +42% | +$48.4K |
|
4865
CALL
World Kinect Corp
WKC
$2.06B
| $140K | ﹤0.01% |
5,100
-8,100
| -61% | -$232K |
|
4866
X4 Pharmaceuticals
XFOR
$377M
| $140K | ﹤0.01% |
6,397
+6,282
| +5,463% | +$100K |
|
|
TE
4867
PUT
T1 Energy
TE
$1.04B
| $140K | ﹤0.01% |
54,600
+42,100
| +337% | +$70.6K |
|
4868
PUT
Camden Property Trust
CPT
$11.5B
| $139K | ﹤0.01% |
1,200
-2,500
| -68% | -$299K |
|
|
DAWN
4869
PUT
DELISTED
Day One Biopharmaceuticals
DAWN
| $139K | ﹤0.01% |
11,000
-40,200
| -79% | -$559K |
|
4870
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$32.2M
| $139K | ﹤0.01% |
+226
| New | +$119K |
|
4871
PUT
Lloyds Banking Group
LYG
$85.2B
| $139K | ﹤0.01% |
51,300
+8,600
| +20% | +$24.6K |
|
4872
PUT
Methanex
MEOH
$4.23B
| $139K | ﹤0.01% |
2,800
+200
| +8% | +$8.79K |
|
4873
PUT
Microvision
MVIS
$84.8M
| $139K | ﹤0.01% |
106,400
+29,100
| +38% | +$30.6K |
|
4874
Ocugen
OCGN
$403M
| $139K | ﹤0.01% |
172,761
+81,798
| +90% | +$74.9K |
|
4875
CALL
ACV Auctions
ACVA
$1.41B
| $138K | ﹤0.01% |
6,400
-2,000
| -24% | -$40.5K |
|
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.