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 | |
|---|---|---|---|---|---|---|
6076
PUT
Ziff Davis
ZD
$1.94B
| $37K | ﹤0.01% |
1,000
+800
| +400% | +$38.4K |
|
6077
CALL
Astrana Health
ASTH
$1.82B
| $37K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$36.6K |
|
6078
Roundhill Daily 2X Long Magnificent Seven ETF
MAGX
$50.7M
| $37K | ﹤0.01% |
1,203
+553
| +85% | +$23.2K |
|
|
SILA
6079
PUT
DELISTED
Sila Realty Trust
SILA
| $37K | ﹤0.01% |
1,400
+600
| +75% | +$15K |
|
|
NAGE
6080
PUT
Niagen Bioscience
NAGE
$264M
| $37K | ﹤0.01% |
5,400
-9,600
| -64% | -$60.3K |
|
6081
CALL
Alto Ingredients
ALTO
$358M
| $36K | ﹤0.01% |
31,700
-7,900
| -20% | -$12.2K |
|
6082
Capital Group Core Equity ETF
CGUS
$11.2B
| $36K | ﹤0.01% |
1,082
-77
| -7% | -$2.71K |
|
6083
Celldex Therapeutics
CLDX
$3.02B
| $36K | ﹤0.01% |
+2,038
| New | +$45.5K |
|
6084
PUT
Dorman Products
DORM
$3.98B
| $36K | ﹤0.01% |
300
-100
| -25% | -$12.8K |
|
6085
PUT
F&G Annuities & Life
FG
$3.86B
| $36K | ﹤0.01% |
+1,000
| New | +$42K |
|
6086
MicroCloud Hologram
HOLO
$36.7M
| $36K | ﹤0.01% |
+1,095
| New | +$65.8K |
|
6087
Dorian LPG
LPG
$1.98B
| $36K | ﹤0.01% |
1,638
-9,083
| -85% | -$210K |
|
6088
CALL
Seres Therapeutics
MCRB
$46.3M
| $36K | ﹤0.01% |
2,605
-9,320
| -78% | -$146K |
|
6089
CALL
MeiraGTx Holdings
MGTX
$1.11B
| $36K | ﹤0.01% |
5,400
+1,500
| +38% | +$10.1K |
|
|
NIU
6090
PUT
Niu Technologies
NIU
$203M
| $36K | ﹤0.01% |
+8,900
| New | +$22.2K |
|
6091
PUT
Paymentus
PAY
$4.39B
| $36K | ﹤0.01% |
1,400
+1,100
| +367% | +$32.6K |
|
6092
CALL
Prime Medicine
PRME
$545M
| $36K | ﹤0.01% |
18,300
-18,600
| -50% | -$47.4K |
|
|
PRO
6093
CALL
DELISTED
PROS Holdings
PRO
| $36K | ﹤0.01% |
1,900
+100
| +6% | +$2.33K |
|
6094
PSQ Holdings
PSQH
$13.9M
| $36K | ﹤0.01% |
1,051
+577
| +122% | +$29.3K |
|
6095
CALL
Dr. Reddy's Laboratories
RDY
$9.85B
| $36K | ﹤0.01% |
2,800
| – | – |
|
|
VLRS
6096
Controladora Vuela Compania de Aviacion
VLRS
$914M
| $36K | ﹤0.01% |
7,086
+4,210
| +146% | +$30.3K |
|
6097
PUT
Waters Corp
WAT
$37.3B
| $36K | ﹤0.01% |
100
-600
| -86% | -$232K |
|
6098
PUT
Xeris Biopharma Holdings
XERS
$1.45B
| $36K | ﹤0.01% |
6,600
+5,800
| +725% | +$23.4K |
|
|
MAGN
6099
PUT
Magnera Corp
MAGN
$475M
| $36K | ﹤0.01% |
+2,000
| New | +$38.9K |
|
|
FNA
6100
DELISTED
Paragon 28, Inc.
FNA
| $36K | ﹤0.01% |
2,795
+2,668
| +2,101% | +$33.2K |
|
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.