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 | |
|---|---|---|---|---|---|---|
6326
CALL
The Joint Corp
JYNT
$119M
| $27K | ﹤0.01% |
+2,200
| New | +$24.9K |
|
6327
PUT
Kaspi.kz JSC
KSPI
$16.6B
| $27K | ﹤0.01% |
300
-5,000
| -94% | -$490K |
|
6328
CALL
Larimar Therapeutics
LRMR
$377M
| $27K | ﹤0.01% |
12,800
-8,300
| -39% | -$26.2K |
|
6329
MeiraGTx Holdings
MGTX
$1.08B
| $27K | ﹤0.01% |
4,031
+1,783
| +79% | +$12K |
|
6330
Energy Vault
NRGV
$455M
| $27K | ﹤0.01% |
39,113
+2,979
| +8% | +$4.58K |
|
6331
PUT
Envista
NVST
$4.62B
| $27K | ﹤0.01% |
1,600
-1,900
| -54% | -$36.9K |
|
6332
ProShares UltraShort QQQ
QID
$305M
| $27K | ﹤0.01% |
730
-39,206
| -98% | -$1.3M |
|
6333
CALL
Rogers Corp
ROG
$2.09B
| $27K | ﹤0.01% |
400
+300
| +300% | +$25.8K |
|
6334
PUT
Seadrill
SDRL
$2.59B
| $27K | ﹤0.01% |
1,100
-7,500
| -87% | -$232K |
|
6335
PUT
Sagimet Biosciences
SGMT
$435M
| $27K | ﹤0.01% |
8,300
-22,000
| -73% | -$92.3K |
|
6336
Smith Micro Software
SMSI
$13.6M
| $27K | ﹤0.01% |
7,617
+521
| +7% | +$3.13K |
|
6337
PUT
TaskUs
TASK
$594M
| $27K | ﹤0.01% |
2,000
+1,100
| +122% | +$16.5K |
|
6338
PUT
Teleflex
TFX
$5.96B
| $27K | ﹤0.01% |
200
+100
| +100% | +$16.2K |
|
6339
Millicom
TIGO
$15.8B
| $27K | ﹤0.01% |
+921
| New | +$25.4K |
|
6340
PUT
Worthington Steel
WS
$1.78B
| $27K | ﹤0.01% |
1,100
| – | – |
|
6341
State Street SPDR S&P Pharmaceuticals ETF
XPH
$481M
| $27K | ﹤0.01% |
+627
| New | +$27.7K |
|
6342
CALL
Arq
ARQ
$83.3M
| $27K | ﹤0.01% |
6,700
-8,700
| -56% | -$49.4K |
|
6343
CALL
Arbutus Biopharma
ABUS
$847M
| $26K | ﹤0.01% |
7,700
-42,100
| -85% | -$140K |
|
|
ACLX
6344
PUT
DELISTED
Arcellx
ACLX
| $26K | ﹤0.01% |
400
-700
| -64% | -$47.4K |
|
6345
PUT
Ardagh Metal Packaging
AMBP
$2.96B
| $26K | ﹤0.01% |
8,700
-7,200
| -45% | -$20.2K |
|
6346
ArcBest
ARCB
$3.16B
| $26K | ﹤0.01% |
370
-41,856
| -99% | -$3.63M |
|
6347
PUT
Acuity Brands
AYI
$9.99B
| $26K | ﹤0.01% |
100
-400
| -80% | -$121K |
|
|
BCYC
6348
PUT
Bicycle Therapeutics
BCYC
$269M
| $26K | ﹤0.01% |
3,100
+2,500
| +417% | +$29.5K |
|
|
CAN
6349
Canaan Creative
CAN
$172M
| $26K | ﹤0.01% |
+30,098
| New | +$47.8K |
|
6350
CALL
Crinetics Pharmaceuticals
CRNX
$8.88B
| $26K | ﹤0.01% |
800
-6,000
| -88% | -$224K |
|
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.