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 | |
|---|---|---|---|---|---|---|
2876
CALL
Ecopetrol
EC
$32.9B
| $841K | ﹤0.01% |
80,600
+51,400
| +176% | +$491K |
|
2877
PUT
Similarweb
SMWB
$551M
| $841K | ﹤0.01% |
101,700
+89,100
| +707% | +$1.1M |
|
2878
Stratasys
SSYS
$697M
| $840K | ﹤0.01% |
+85,893
| New | +$883K |
|
2879
PUT
ADT
ADT
$5.16B
| $839K | ﹤0.01% |
103,100
+98,700
| +2,243% | +$745K |
|
2880
CALL
Assured Guaranty
AGO
$3.78B
| $836K | ﹤0.01% |
9,500
+3,300
| +53% | +$296K |
|
2881
Viking Holdings
VIK
$44.9B
| $836K | ﹤0.01% |
+21,056
| New | +$971K |
|
|
GES
2882
PUT
DELISTED
Guess Inc
GES
| $835K | ﹤0.01% |
75,500
-76,500
| -50% | -$924K |
|
2883
PUT
DigitalOcean
DOCN
$14.4B
| $834K | ﹤0.01% |
25,000
-24,600
| -50% | -$961K |
|
|
JWN
2884
PUT
DELISTED
Nordstrom
JWN
| $833K | ﹤0.01% |
34,100
-61,500
| -64% | -$1.49M |
|
2885
PUT
Mistras Group
MG
$492M
| $832K | ﹤0.01% |
78,700
+13,100
| +20% | +$129K |
|
2886
Wolverine World Wide
WWW
$1.54B
| $830K | ﹤0.01% |
59,739
+28,496
| +91% | +$520K |
|
2887
CenterPoint Energy
CNP
$29.1B
| $829K | ﹤0.01% |
22,903
-52,267
| -70% | -$1.75M |
|
|
SOBO
2888
CALL
South Bow Corp
SOBO
$8.03B
| $829K | ﹤0.01% |
+32,500
| New | +$813K |
|
2889
EPAM Systems
EPAM
$4.69B
| $825K | ﹤0.01% |
4,888
+319
| +7% | +$70.4K |
|
2890
CALL
Otis Worldwide
OTIS
$27.4B
| $825K | ﹤0.01% |
8,000
-65,800
| -89% | -$6.43M |
|
2891
TeraWulf
WULF
$9.15B
| $825K | ﹤0.01% |
302,199
+138,832
| +85% | +$618K |
|
|
K
2892
PUT
DELISTED
Kellanova
K
| $824K | ﹤0.01% |
10,400
-41,800
| -80% | -$3.43M |
|
2893
Credo Technology Group
CRDO
$39.7B
| $823K | ﹤0.01% |
+20,515
| New | +$1.28M |
|
2894
CALL
Ero Copper
ERO
$2.71B
| $822K | ﹤0.01% |
67,900
+27,500
| +68% | +$367K |
|
2895
PUT
International Flavors & Fragrances
IFF
$19.4B
| $822K | ﹤0.01% |
10,600
-44,600
| -81% | -$3.68M |
|
2896
PUT
Asana
ASAN
$1.58B
| $821K | ﹤0.01% |
56,400
+4,100
| +8% | +$77.8K |
|
2897
CALL
Federal Realty Investment Trust
FRT
$10.9B
| $821K | ﹤0.01% |
8,400
+6,600
| +367% | +$686K |
|
|
HOLX
2898
CALL
DELISTED
Hologic
HOLX
| $821K | ﹤0.01% |
13,300
-3,700
| -22% | -$245K |
|
|
ONC
2899
BeOne Medicines Ltd
ONC
$33.8B
| $821K | ﹤0.01% |
+3,017
| New | +$705K |
|
2900
CALL
Matsons
MATX
$6.37B
| $820K | ﹤0.01% |
6,400
+3,000
| +88% | +$411K |
|
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.