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 | |
|---|---|---|---|---|---|---|
6376
Watts Water Technologies
WTS
$11.2B
| $26K | ﹤0.01% |
+132
| New | +$27.7K |
|
6377
X4 Pharmaceuticals
XFOR
$377M
| $26K | ﹤0.01% |
3,723
-2,674
| -42% | -$36.8K |
|
6378
Arq
ARQ
$83.3M
| $26K | ﹤0.01% |
+6,248
| New | +$35.5K |
|
6379
Allogene Therapeutics
ALLO
$625M
| $25K | ﹤0.01% |
17,671
-50,640
| -74% | -$95.5K |
|
6380
PUT
Arbe Robotics
ARBE
$73.3M
| $25K | ﹤0.01% |
+24,400
| New | +$53.8K |
|
6381
CALL
Brink's
BCO
$5.01B
| $25K | ﹤0.01% |
300
| – | – |
|
|
BGFV
6382
PUT
DELISTED
Big 5 Sporting Goods
BGFV
| $25K | ﹤0.01% |
26,400
+21,900
| +487% | +$30K |
|
6383
Vanguard Long-Term Bond ETF
BLV
$5.74B
| $25K | ﹤0.01% |
368
+210
| +133% | +$14.6K |
|
6384
PUT
Betterware México
BWMX
$632M
| $25K | ﹤0.01% |
2,200
+1,000
| +83% | +$11.4K |
|
6385
CALL
Compañía de Cervecerías Unidas
CCU
$2.14B
| $25K | ﹤0.01% |
1,700
+1,400
| +467% | +$18.5K |
|
6386
Comtech Telecommunications
CMTL
$49.7M
| $25K | ﹤0.01% |
15,755
-65,880
| -81% | -$151K |
|
|
HELP
6387
PUT
Cybin Inc
HELP
$490M
| $25K | ﹤0.01% |
4,000
-64,100
| -94% | -$555K |
|
|
DAWN
6388
PUT
DELISTED
Day One Biopharmaceuticals
DAWN
| $25K | ﹤0.01% |
3,200
-7,800
| -71% | -$84K |
|
6389
PUT
IDT Corp
IDT
$1.67B
| $25K | ﹤0.01% |
500
-11,300
| -96% | -$548K |
|
6390
PUT
Independence Realty Trust
IRT
$3.98B
| $25K | ﹤0.01% |
1,200
+100
| +9% | +$2.01K |
|
6391
CALL
Ituran Location and Control
ITRN
$1.08B
| $25K | ﹤0.01% |
700
-400
| -36% | -$14.4K |
|
6392
Lightwave Logic
LWLG
$824M
| $25K | ﹤0.01% |
25,263
-88,650
| -78% | -$138K |
|
6393
La-Z-Boy
LZB
$1.64B
| $25K | ﹤0.01% |
+656
| New | +$28.4K |
|
6394
CALL
Mizuho Financial
MFG
$120B
| $25K | ﹤0.01% |
4,700
-1,600
| -25% | -$8.8K |
|
|
MRUS
6395
PUT
DELISTED
Merus
MRUS
| $25K | ﹤0.01% |
600
-800
| -57% | -$34.9K |
|
6396
AdvisorShares MSOS 2X Daily ETF
MSOX
$45.3M
| $25K | ﹤0.01% |
6,345
+4,290
| +209% | +$27.4K |
|
6397
Insight Enterprises
NSIT
$3.85B
| $25K | ﹤0.01% |
+173
| New | +$27.8K |
|
6398
CALL
Odyssey Marine Exploration
OMEX
$37.7M
| $25K | ﹤0.01% |
63,500
-36,700
| -37% | -$18.7K |
|
6399
PUT
Phillips Edison & Co
PECO
$5.5B
| $25K | ﹤0.01% |
+700
| New | +$25.3K |
|
6400
CALL
FreightCar America
RAIL
$263M
| $25K | ﹤0.01% |
4,700
-15,100
| -76% | -$143K |
|
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.