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 | |
|---|---|---|---|---|---|---|
5651
CALL
A10 Networks
ATEN
$2.13B
| $55K | ﹤0.01% |
3,400
+1,500
| +79% | +$28.8K |
|
5652
CALL
Aviat Networks
AVNW
$265M
| $55K | ﹤0.01% |
+2,900
| New | +$58.6K |
|
5653
Teucrium Sugar Fund
CANE
$74.6M
| $55K | ﹤0.01% |
+4,561
| New | +$54.2K |
|
5654
PUT
CubeSmart
CUBE
$9.39B
| $55K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$50.1K |
|
5655
CALL
Casella Waste Systems
CWST
$5.71B
| $55K | ﹤0.01% |
500
-3,200
| -86% | -$350K |
|
|
GAU
5656
CALL
Galiano Gold
GAU
$455M
| $55K | ﹤0.01% |
45,000
+14,700
| +49% | +$18.1K |
|
|
LKFT
5657
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.81B
| $55K | ﹤0.01% |
2,200
+1,400
| +175% | +$35.4K |
|
5658
CALL
Gentex
GNTX
$4.97B
| $55K | ﹤0.01% |
2,400
-48,300
| -95% | -$1.24M |
|
|
GOOD
5659
CALL
Gladstone Commercial Corp
GOOD
$605M
| $55K | ﹤0.01% |
3,700
-1,100
| -23% | -$17.3K |
|
5660
CALL
ICU Medical
ICUI
$4.21B
| $55K | ﹤0.01% |
400
-900
| -69% | -$140K |
|
5661
PUT
International General Insurance
IGIC
$1.19B
| $55K | ﹤0.01% |
2,100
-1,400
| -40% | -$35.5K |
|
5662
PUT
IHS Holding
IHS
$2.76B
| $55K | ﹤0.01% |
10,700
+500
| +5% | +$1.92K |
|
5663
CALL
MBIA
MBI
$261M
| $55K | ﹤0.01% |
11,200
-6,700
| -37% | -$41.5K |
|
5664
PUT
Metropolitan Bank Holding Corp
MCB
$1.15B
| $55K | ﹤0.01% |
1,000
-12,600
| -93% | -$749K |
|
5665
CALL
Neumora Therapeutics
NMRA
$298M
| $55K | ﹤0.01% |
55,600
-90,500
| -62% | -$155K |
|
|
NOTV
5666
PUT
DELISTED
Inotiv
NOTV
| $55K | ﹤0.01% |
25,200
-4,900
| -16% | -$18K |
|
|
NSA
5667
CALL
DELISTED
National Storage Affiliates Trust
NSA
| $55K | ﹤0.01% |
+1,400
| New | +$52.7K |
|
5668
Outset Medical
OM
$84.7M
| $55K | ﹤0.01% |
5,043
+1,254
| +33% | +$15K |
|
5669
CALL
Phathom Pharmaceuticals
PHAT
$708M
| $55K | ﹤0.01% |
+8,800
| New | +$53.4K |
|
5670
CALL
PJT Partners
PJT
$4.3B
| $55K | ﹤0.01% |
+400
| New | +$62.9K |
|
5671
CALL
QuinStreet
QNST
$890M
| $55K | ﹤0.01% |
3,100
-50,800
| -94% | -$1.06M |
|
5672
Replimune Group
REPL
$941M
| $55K | ﹤0.01% |
+5,646
| New | +$69.9K |
|
5673
CALL
SES AI
SES
$203M
| $55K | ﹤0.01% |
106,300
-153,700
| -59% | -$141K |
|
5674
Teucrium Soybean Fund
SOYB
$61M
| $55K | ﹤0.01% |
2,580
+1,878
| +268% | +$40.9K |
|
|
LUCK
5675
PUT
Lucky Strike Entertainment
LUCK
$914M
| $55K | ﹤0.01% |
5,700
+4,700
| +470% | +$49.2K |
|
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.