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 | |
|---|---|---|---|---|---|---|
5526
CALL
Gentherm
THRM
$1.25B
| $64K | ﹤0.01% |
2,400
+1,800
| +300% | +$63K |
|
5527
CALL
Trinity Industries
TRN
$2.49B
| $64K | ﹤0.01% |
2,300
-5,000
| -68% | -$168K |
|
5528
CALL
Select Water Solutions
WTTR
$2.3B
| $64K | ﹤0.01% |
6,100
-11,800
| -66% | -$143K |
|
|
ZIMV
5529
PUT
DELISTED
ZimVie
ZIMV
| $64K | ﹤0.01% |
6,000
+5,000
| +500% | +$65.7K |
|
5530
CALL
DMC Global
BOOM
$138M
| $63K | ﹤0.01% |
7,500
-4,800
| -39% | -$39.2K |
|
5531
PUT
Flowserve
FLS
$9.71B
| $63K | ﹤0.01% |
1,300
-7,600
| -85% | -$432K |
|
5532
CALL
Flotek Industries
FTK
$852M
| $63K | ﹤0.01% |
7,600
+6,100
| +407% | +$52.7K |
|
5533
CALL
German American Bancorp
GABC
$1.91B
| $63K | ﹤0.01% |
+1,700
| New | +$66.9K |
|
5534
Direxion Daily S&P 500 High Beta Bear 3X ETF
HIBS
$26M
| $63K | ﹤0.01% |
+251
| New | +$48.5K |
|
5535
CALL
Methanex
MEOH
$4.3B
| $63K | ﹤0.01% |
1,800
-2,800
| -61% | -$126K |
|
|
MODV
5536
PUT
DELISTED
ModivCare
MODV
| $63K | ﹤0.01% |
48,000
+45,400
| +1,746% | +$220K |
|
5537
PUT
Marqeta
MQ
$1.83B
| $63K | ﹤0.01% |
3,825
-10,750
| -74% | -$169K |
|
5538
Myomo
MYO
$39M
| $63K | ﹤0.01% |
13,292
-3,806
| -22% | -$21.7K |
|
5539
PUT
Navigator Holdings
NVGS
$1.38B
| $63K | ﹤0.01% |
4,800
-300
| -6% | -$4.66K |
|
5540
Radware
RDWR
$1.1B
| $63K | ﹤0.01% |
2,958
+1,000
| +51% | +$22.3K |
|
5541
PUT
Ryanair
RYAAY
$30.4B
| $63K | ﹤0.01% |
1,500
+200
| +15% | +$9.13K |
|
5542
PUT
Tandem Diabetes Care
TNDM
$1.34B
| $63K | ﹤0.01% |
3,300
-2,400
| -42% | -$70.2K |
|
5543
Teekay Tankers
TNK
$2.75B
| $63K | ﹤0.01% |
+1,670
| New | +$67.6K |
|
5544
CALL
Essential Utilities
WTRG
$11.3B
| $63K | ﹤0.01% |
1,600
+700
| +78% | +$25.7K |
|
5545
NEOS Nasdaq 100 High Income ETF
QQQI
$13.3B
| $63K | ﹤0.01% |
1,331
+1,284
| +2,732% | +$66.3K |
|
|
NWECW
5546
CALL
DELISTED
NORTHWESTERN CORPORATION WARANTS
NWECW
| $63K | ﹤0.01% |
+1,100
| New | +$63K |
|
5547
Arcosa
ACA
$7.13B
| $62K | ﹤0.01% |
807
-139
| -15% | -$12.8K |
|
5548
PUT
AudioCodes
AUDC
$244M
| $62K | ﹤0.01% |
+6,600
| New | +$70.4K |
|
5549
Breakwave Dry Bulk Shipping ETF
BDRY
$29.5M
| $62K | ﹤0.01% |
9,933
+6,889
| +226% | +$41.9K |
|
5550
CALL
Coherus Oncology
CHRS
$217M
| $62K | ﹤0.01% |
77,000
-206,100
| -73% | -$237K |
|
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.