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 | |
|---|---|---|---|---|---|---|
6301
PUT
Personalis
PSNL
$1.25B
| $28K | ﹤0.01% |
8,000
+7,500
| +1,500% | +$35.6K |
|
6302
CALL
Qiagen
QGEN
$8.62B
| $28K | ﹤0.01% |
+700
| New | +$29.4K |
|
|
6303
PUT
Qiagen
QGEN
$8.62B
| $28K | ﹤0.01% |
700
-12,619
| -95% | -$531K |
|
|
RDUS
6304
DELISTED
Radius Recycling
RDUS
| $28K | ﹤0.01% |
972
+287
| +42% | +$4.63K |
|
6305
CALL
Replimune Group
REPL
$455M
| $28K | ﹤0.01% |
2,900
-100
| -3% | -$1.24K |
|
6306
PUT
Sonoco
SON
$5.83B
| $28K | ﹤0.01% |
600
+500
| +500% | +$23.6K |
|
|
SRG
6307
PUT
Seritage Growth Properties
SRG
$138M
| $28K | ﹤0.01% |
8,700
-12,800
| -60% | -$46.9K |
|
6308
Suzano
SUZ
$10.2B
| $28K | ﹤0.01% |
3,015
+1,657
| +122% | +$16.6K |
|
6309
CALL
BlackRock TCP Capital
TCPC
$278M
| $28K | ﹤0.01% |
3,500
+2,500
| +250% | +$21.7K |
|
6310
PUT
Timken Company
TKR
$9.19B
| $28K | ﹤0.01% |
400
-46,600
| -99% | -$3.6M |
|
6311
Tandem Diabetes Care
TNDM
$1.27B
| $28K | ﹤0.01% |
+1,503
| New | +$44K |
|
6312
PUT
UroGen Pharma
URGN
$1.97B
| $28K | ﹤0.01% |
2,600
+2,100
| +420% | +$22.4K |
|
6313
Vanguard Intermediate-Term Corporate Bond ETF
VCIT
$66.2B
| $28K | ﹤0.01% |
351
-391
| -53% | -$31.6K |
|
6314
Aldeyra Therapeutics
ALDX
$97.1M
| $27K | ﹤0.01% |
4,711
-40,521
| -90% | -$240K |
|
6315
PUT
ALX Oncology
ALXO
$262M
| $27K | ﹤0.01% |
44,300
-4,700
| -10% | -$5.64K |
|
6316
PUT
Apogee Enterprises
APOG
$833M
| $27K | ﹤0.01% |
600
+500
| +500% | +$25.5K |
|
6317
Axogen
AXGN
$2.2B
| $27K | ﹤0.01% |
+1,505
| New | +$27.2K |
|
6318
PUT
Baytex Energy
BTE
$2.96B
| $27K | ﹤0.01% |
12,500
+11,000
| +733% | +$26.2K |
|
6319
CALL
Crescent Capital BDC
CCAP
$405M
| $27K | ﹤0.01% |
1,600
+1,400
| +700% | +$26.1K |
|
6320
CALL
Celcuity
CELC
$4.06B
| $27K | ﹤0.01% |
+2,700
| New | +$30.5K |
|
6321
Cullinan Oncology
CGEM
$1.06B
| $27K | ﹤0.01% |
3,598
+2,195
| +156% | +$21.1K |
|
6322
PUT
Cemex
CX
$16.9B
| $27K | ﹤0.01% |
4,900
-14,500
| -75% | -$87.7K |
|
6323
Fox Factory Holding Corp
FOXF
$794M
| $27K | ﹤0.01% |
1,173
+165
| +16% | +$4.42K |
|
6324
CALL
Greif
GEF
$4.95B
| $27K | ﹤0.01% |
500
-8,300
| -94% | -$489K |
|
6325
CGI
GIB
$15.4B
| $27K | ﹤0.01% |
272
+207
| +318% | +$22.7K |
|
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.