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 | |
|---|---|---|---|---|---|---|
6876
CALL
Aquestive Therapeutics
AQST
$472M
| $13K | ﹤0.01% |
4,600
-15,600
| -77% | -$47.2K |
|
6877
ARK Blockchain & Fintech Innovation ETF
ARKF
$744M
| $13K | ﹤0.01% |
392
-5,639
| -94% | -$217K |
|
6878
PUT
Astec Industries
ASTE
$1.26B
| $13K | ﹤0.01% |
400
-5,000
| -93% | -$172K |
|
6879
Avantis International Equity ETF
AVDE
$17.8B
| $13K | ﹤0.01% |
202
-122
| -38% | -$7.94K |
|
6880
CALL
BARK
BARK
$78.4M
| $13K | ﹤0.01% |
490
-265
| -35% | -$9.27K |
|
6881
Blackbaud
BLKB
$1.65B
| $13K | ﹤0.01% |
+214
| New | +$15.2K |
|
6882
PUT
Bank of Hawaii
BOH
$3.17B
| $13K | ﹤0.01% |
200
-200
| -50% | -$14.2K |
|
|
BORR
6883
PUT
Borr Drilling
BORR
$1.2B
| $13K | ﹤0.01% |
6,200
-29,400
| -83% | -$88.5K |
|
6884
iShares CMBS ETF
CMBS
$474M
| $13K | ﹤0.01% |
286
| – | – |
|
6885
PUT
Caribou Biosciences
CRBU
$148M
| $13K | ﹤0.01% |
15,200
+10,300
| +210% | +$13.4K |
|
6886
PUT
Crinetics Pharmaceuticals
CRNX
$8.88B
| $13K | ﹤0.01% |
400
-700
| -64% | -$26.1K |
|
6887
Custom Truck One Source
CTOS
$2.35B
| $13K | ﹤0.01% |
+3,171
| New | +$15.3K |
|
6888
PUT
CVRx
CVRX
$131M
| $13K | ﹤0.01% |
1,100
-5,300
| -83% | -$74.9K |
|
6889
CALL
CXApp
CXAI
$13.7M
| $13K | ﹤0.01% |
14,800
+1,800
| +14% | +$2.54K |
|
|
DAWN
6890
DELISTED
Day One Biopharmaceuticals
DAWN
| $13K | ﹤0.01% |
+1,665
| New | +$17.9K |
|
6891
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.69B
| $13K | ﹤0.01% |
+285
| New | +$14K |
|
6892
Digimarc Corp
DMRC
$145M
| $13K | ﹤0.01% |
1,082
-7,140
| -87% | -$204K |
|
6893
CALL
Dole
DOLE
$1.35B
| $13K | ﹤0.01% |
900
-30,500
| -97% | -$421K |
|
6894
CALL
EverQuote
EVER
$960M
| $13K | ﹤0.01% |
500
-17,300
| -97% | -$396K |
|
|
FARO
6895
CALL
DELISTED
Faro Technologies
FARO
| $13K | ﹤0.01% |
+500
| New | +$14.7K |
|
6896
4D Molecular Therapeutics
FDMT
$515M
| $13K | ﹤0.01% |
4,313
-10,418
| -71% | -$49.1K |
|
6897
CALL
Freedom Holding
FRHC
$9.84B
| $13K | ﹤0.01% |
100
-600
| -86% | -$83.8K |
|
6898
The Greenbrier Companies
GBX
$1.6B
| $13K | ﹤0.01% |
+257
| New | +$15.4K |
|
6899
CALL
Garrett Motion
GTX
$5.6B
| $13K | ﹤0.01% |
1,600
-4,300
| -73% | -$39.9K |
|
6900
Inovio Pharmaceuticals
INO
$84.7M
| $13K | ﹤0.01% |
8,176
-17,617
| -68% | -$35.4K |
|
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.