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 | |
|---|---|---|---|---|---|---|
5601
Lantronix
LTRX
$240M
| $59K | ﹤0.01% |
23,827
-43,255
| -64% | -$139K |
|
5602
Reinsurance Group of America
RGA
$15.5B
| $59K | ﹤0.01% |
+304
| New | +$63K |
|
|
SVM
5603
PUT
Silvercorp Metals
SVM
$2.07B
| $59K | ﹤0.01% |
15,300
+11,200
| +273% | +$39.3K |
|
5604
Zebra Technologies
ZBRA
$14B
| $59K | ﹤0.01% |
210
+74
| +54% | +$25.3K |
|
|
DENN
5605
CALL
DELISTED
Denny's
DENN
| $58K | ﹤0.01% |
15,900
+700
| +5% | +$3.69K |
|
5606
Eton Pharmaceutcials
ETON
$1.27B
| $58K | ﹤0.01% |
4,472
-31,904
| -88% | -$482K |
|
5607
PUT
HUTCHMED
HCM
$1.93B
| $58K | ﹤0.01% |
3,900
-12,200
| -76% | -$180K |
|
5608
CALL
Lithia Motors
LAD
$8.47B
| $58K | ﹤0.01% |
200
-800
| -80% | -$272K |
|
5609
Enpro
NPO
$6.63B
| $58K | ﹤0.01% |
364
-4,764
| -93% | -$856K |
|
5610
PUT
Rhythm Pharmaceuticals
RYTM
$6.81B
| $58K | ﹤0.01% |
1,100
-3,800
| -78% | -$211K |
|
|
SAGE
5611
PUT
DELISTED
Sage Therapeutics
SAGE
| $58K | ﹤0.01% |
7,300
+6,900
| +1,725% | +$50.5K |
|
5612
Sprout Social
SPT
$516M
| $58K | ﹤0.01% |
2,647
-611
| -19% | -$17.8K |
|
|
TUYA
5613
CALL
Tuya Inc
TUYA
$1.03B
| $58K | ﹤0.01% |
19,400
-1,400
| -7% | -$4.14K |
|
5614
PUT
Wolverine World Wide
WWW
$1.61B
| $58K | ﹤0.01% |
4,200
+4,100
| +4,100% | +$74.8K |
|
5615
Xperi
XPER
$372M
| $58K | ﹤0.01% |
+7,601
| New | +$66.5K |
|
|
MKFG
5616
PUT
DELISTED
Markforged Holding Corporation
MKFG
| $58K | ﹤0.01% |
12,600
-5,200
| -29% | -$15.9K |
|
5617
CALL
Allison Transmission
ALSN
$9.5B
| $57K | ﹤0.01% |
600
-2,500
| -81% | -$265K |
|
5618
CALL
Archrock
AROC
$6.27B
| $57K | ﹤0.01% |
2,200
-2,300
| -51% | -$62.1K |
|
|
AUTL
5619
CALL
Autolus Therapeutics
AUTL
$407M
| $57K | ﹤0.01% |
37,400
+18,900
| +102% | +$38.4K |
|
5620
Backblaze
BLZE
$823M
| $57K | ﹤0.01% |
+11,911
| New | +$73.3K |
|
5621
CALL
Biomea Fusion
BMEA
$84.6M
| $57K | ﹤0.01% |
27,000
-416,200
| -94% | -$1.42M |
|
5622
CALL
Badger Meter
BMI
$3.89B
| $57K | ﹤0.01% |
300
-2,400
| -89% | -$501K |
|
5623
PUT
Chegg
CHGG
$110M
| $57K | ﹤0.01% |
90,600
+10,900
| +14% | +$13.5K |
|
|
CMPS
5624
PUT
Compass Pathways
CMPS
$1.53B
| $57K | ﹤0.01% |
20,100
-11,100
| -36% | -$42.6K |
|
5625
GrafTech
EAF
$175M
| $57K | ﹤0.01% |
+6,581
| New | +$85.5K |
|
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.