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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3826
INmune Bio
INMB
$45.5M
| $334K | ﹤0.01% |
+42,809
| New | +$340K |
|
3827
CALL
TETRA Technologies
TTI
$1.07B
| $334K | ﹤0.01% |
99,600
| – | – |
|
3828
CALL
Nordic American Tanker
NAT
$1.35B
| $333K | ﹤0.01% |
135,600
-17,900
| -12% | -$47.2K |
|
3829
NOV
NOV
$7.11B
| $333K | ﹤0.01% |
21,922
-29,804
| -58% | -$446K |
|
3830
Similarweb
SMWB
$630M
| $333K | ﹤0.01% |
+40,314
| New | +$497K |
|
3831
PUT
Capital Southwest
CSWC
$1.48B
| $332K | ﹤0.01% |
14,900
+7,300
| +96% | +$165K |
|
3832
CALL
United Microelectronic
UMC
$43.6B
| $332K | ﹤0.01% |
46,500
+9,300
| +25% | +$59.2K |
|
3833
PUT
Dime Commercial Bancshares
DCOM
$1.8B
| $331K | ﹤0.01% |
11,900
+11,200
| +1,600% | +$339K |
|
3834
CALL
Evolent Health
EVH
$421M
| $331K | ﹤0.01% |
35,000
-30,100
| -46% | -$304K |
|
3835
PUT
Alight
ALIT
$523M
| $330K | ﹤0.01% |
2,790
+345
| +14% | +$45.4K |
|
3836
PUT
American Superconductor
AMSC
$1.39B
| $330K | ﹤0.01% |
18,200
-51,400
| -74% | -$1.28M |
|
3837
PUT
CACI
CACI
$11.3B
| $330K | ﹤0.01% |
900
-2,700
| -75% | -$1.03M |
|
3838
PUT
Global Partners
GLP
$1.65B
| $330K | ﹤0.01% |
+6,200
| New | +$335K |
|
|
FLNA
3839
CALL
Filana Therapeutics
FLNA
$42.7M
| $330K | ﹤0.01% |
220,100
-94,100
| -30% | -$237K |
|
3840
CALL
Helmerich & Payne
HP
$3.31B
| $329K | ﹤0.01% |
12,600
+1,400
| +13% | +$40.7K |
|
3841
PUT
Vanguard Total Bond Market
BND
$158B
| $328K | ﹤0.01% |
4,500
+3,800
| +543% | +$276K |
|
3842
Chord Energy
CHRD
$7.25B
| $328K | ﹤0.01% |
2,913
-1,638
| -36% | -$186K |
|
3843
United States Copper Index Fund
CPER
$742M
| $328K | ﹤0.01% |
+10,387
| New | +$299K |
|
3844
CALL
Murphy USA
MUSA
$11.1B
| $328K | ﹤0.01% |
700
-1,400
| -67% | -$665K |
|
3845
PUT
abrdn Physical Silver Shares ETF
SIVR
$3.97B
| $328K | ﹤0.01% |
10,100
+9,900
| +4,950% | +$301K |
|
3846
CALL
Viridian Therapeutics
VRDN
$2.15B
| $328K | ﹤0.01% |
24,400
+9,600
| +65% | +$164K |
|
|
VRN
3847
DELISTED
Veren
VRN
| $328K | ﹤0.01% |
49,647
-85,471
| -63% | -$473K |
|
3848
CALL
Genworth Financial
GNW
$3.85B
| $327K | ﹤0.01% |
46,200
-16,300
| -26% | -$113K |
|
3849
CALL
PubMatic
PUBM
$605M
| $327K | ﹤0.01% |
35,800
-13,800
| -28% | -$182K |
|
3850
CALL
Brixmor Property Group
BRX
$9.77B
| $326K | ﹤0.01% |
12,300
+11,200
| +1,018% | +$298K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.