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 | |
|---|---|---|---|---|---|---|
6401
Sana Biotechnology
SANA
$882M
| $25K | ﹤0.01% |
+15,473
| New | +$43.3K |
|
6402
CALL
SPX Corp
SPXC
$9.39B
| $25K | ﹤0.01% |
200
-600
| -75% | -$85.9K |
|
6403
PUT
Stoke Therapeutics
STOK
$1.84B
| $25K | ﹤0.01% |
+3,900
| New | +$36.4K |
|
6404
PUT
Sun Communities
SUI
$15.8B
| $25K | ﹤0.01% |
200
-10,200
| -98% | -$1.3M |
|
|
TWO
6405
PUT
Two Harbors Investment
TWO
$1.27B
| $25K | ﹤0.01% |
1,900
-1,400
| -42% | -$18.1K |
|
|
YQ
6406
17 Education & Technology Group
YQ
$19.8M
| $25K | ﹤0.01% |
13,489
+11,700
| +654% | +$22.1K |
|
6407
CALL
AirSculpt Technologies
AIRS
$308M
| $24K | ﹤0.01% |
10,700
-3,500
| -25% | -$15.7K |
|
6408
CALL
Accuray
ARAY
$27.5M
| $24K | ﹤0.01% |
13,800
+10,400
| +306% | +$21.8K |
|
6409
PUT
A2Z Smart Technologies
AZ
$241M
| $24K | ﹤0.01% |
+3,400
| New | +$23.6K |
|
6410
PUT
Blackbaud
BLKB
$1.94B
| $24K | ﹤0.01% |
400
-700
| -64% | -$49.8K |
|
6411
PUT
Calix
CALX
$2.24B
| $24K | ﹤0.01% |
700
-500
| -42% | -$18.6K |
|
6412
CarGurus
CARG
$3.34B
| $24K | ﹤0.01% |
+849
| New | +$29.7K |
|
6413
PUT
Clean Energy Fuels
CLNE
$416M
| $24K | ﹤0.01% |
15,600
-14,200
| -48% | -$36.1K |
|
6414
CALL
CVRx
CVRX
$131M
| $24K | ﹤0.01% |
2,000
-300
| -13% | -$4.24K |
|
6415
PUT
California Water Service
CWT
$3.1B
| $24K | ﹤0.01% |
500
+400
| +400% | +$18.2K |
|
6416
CALL
National Beverage
FIZZ
$3.06B
| $24K | ﹤0.01% |
600
-3,600
| -86% | -$148K |
|
6417
CALL
Granite Ridge Resources
GRNT
$621M
| $24K | ﹤0.01% |
4,100
-10,200
| -71% | -$63.1K |
|
|
GTY
6418
PUT
Getty Realty Corp
GTY
$2.16B
| $24K | ﹤0.01% |
800
-200
| -20% | -$6.13K |
|
|
IMMP
6419
CALL
Immutep
IMMP
$56.1M
| $24K | ﹤0.01% |
13,800
+6,100
| +79% | +$11.7K |
|
6420
Inter&Co
INTR
$2.39B
| $24K | ﹤0.01% |
4,396
-40,450
| -90% | -$210K |
|
6421
JB Hunt Transport Services
JBHT
$25.9B
| $24K | ﹤0.01% |
163
+154
| +1,711% | +$25.4K |
|
6422
CALL
Kiniksa Pharmaceuticals
KNSA
$6.23B
| $24K | ﹤0.01% |
1,100
-1,200
| -52% | -$24.7K |
|
6423
CALL
Quaker Houghton
KWR
$2.58B
| $24K | ﹤0.01% |
+200
| New | +$27.1K |
|
6424
CALL
MiMedx Group
MDXG
$630M
| $24K | ﹤0.01% |
3,200
-11,700
| -79% | -$97.8K |
|
|
MITT
6425
CALL
TPG Mortgage Investment Trust
MITT
$228M
| $24K | ﹤0.01% |
3,300
-2,100
| -39% | -$14.9K |
|
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.