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 | |
|---|---|---|---|---|---|---|
4976
PUT
Vanguard S&P 500 Growth ETF
VOOG
$25.7B
| $109K | ﹤0.01% |
2,400
-18,000
| -88% | -$1.09M |
|
4977
CALL
Zevia
ZVIA
$118M
| $109K | ﹤0.01% |
50,500
-53,000
| -51% | -$173K |
|
4978
PUT
Addus HomeCare
ADUS
$2.15B
| $108K | ﹤0.01% |
+1,100
| New | +$122K |
|
4979
PUT
Ameresco
AMRC
$1.11B
| $108K | ﹤0.01% |
9,000
+8,600
| +2,150% | +$156K |
|
4980
Cerence
CRNC
$379M
| $108K | ﹤0.01% |
+13,749
| New | +$169K |
|
|
DX
4981
Dynex Capital
DX
$3.15B
| $108K | ﹤0.01% |
+8,369
| New | +$112K |
|
4982
CALL
Wolverine World Wide
WWW
$1.61B
| $108K | ﹤0.01% |
7,800
-1,500
| -16% | -$27.4K |
|
|
ABX
4983
PUT
Abacus Global Management
ABX
$996M
| $107K | ﹤0.01% |
14,400
-17,600
| -55% | -$134K |
|
4984
PUT
AnaptysBio
ANAB
$1.57B
| $107K | ﹤0.01% |
5,800
-195,800
| -97% | -$3.27M |
|
4985
PUT
Broadstone Net Lease
BNL
$4.12B
| $107K | ﹤0.01% |
6,300
+100
| +2% | +$1.62K |
|
4986
Roundhill Generative AI & Technology ETF
CHAT
$1.75B
| $107K | ﹤0.01% |
3,083
-3,218
| -51% | -$129K |
|
4987
PUT
First Industrial Realty Trust
FR
$8.66B
| $107K | ﹤0.01% |
2,000
+800
| +67% | +$43.3K |
|
4988
PUT
Omnicom Group
OMC
$21.6B
| $107K | ﹤0.01% |
1,300
-900
| -41% | -$75.2K |
|
|
SMST
4989
Defiance Daily Target 2x Short MSTR ETF
SMST
$31.5M
| $107K | ﹤0.01% |
1,312
+1,191
| +984% | +$123K |
|
4990
CALL
Heritage Insurance Holdings
HRTG
$884M
| $106K | ﹤0.01% |
7,400
+5,500
| +289% | +$66.1K |
|
4991
PUT
Heartland Express
HTLD
$970M
| $106K | ﹤0.01% |
11,600
-31,300
| -73% | -$331K |
|
|
NOVA
4992
PUT
DELISTED
Sunnova Energy
NOVA
| $106K | ﹤0.01% |
286,900
-57,400
| -17% | -$110K |
|
|
FLNA
4993
PUT
Filana Therapeutics
FLNA
$48.1M
| $106K | ﹤0.01% |
70,800
-380,000
| -84% | -$959K |
|
|
CURB
4994
Curbline Properties
CURB
$3.52B
| $106K | ﹤0.01% |
4,390
-107
| -2% | -$2.58K |
|
|
ASA
4995
CALL
ASA Gold and Precious Metals
ASA
$924M
| $105K | ﹤0.01% |
3,500
+2,100
| +150% | +$52.1K |
|
4996
Churchill Downs
CHDN
$5.89B
| $105K | ﹤0.01% |
+953
| New | +$114K |
|
4997
i3 Verticals
IIIV
$407M
| $105K | ﹤0.01% |
4,289
-1,505
| -26% | -$38.1K |
|
|
MFA
4998
PUT
MFA Financial
MFA
$918M
| $105K | ﹤0.01% |
10,300
-8,900
| -46% | -$93.2K |
|
4999
Mueller Industries
MLI
$14.9B
| $105K | ﹤0.01% |
2,782
-1,960
| -41% | -$78.3K |
|
5000
PUT
PRA Group
PRAA
$658M
| $105K | ﹤0.01% |
5,100
+200
| +4% | +$4.24K |
|
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.