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 | |
|---|---|---|---|---|---|---|
6676
CALL
Wyndham Hotels & Resorts
WH
$5.67B
| $18K | ﹤0.01% |
+200
| New | +$20.3K |
|
6677
CALL
Warby Parker
WRBY
$3.1B
| $18K | ﹤0.01% |
1,000
-51,300
| -98% | -$1.22M |
|
6678
PUT
Woodward
WWD
$23.7B
| $18K | ﹤0.01% |
100
| – | – |
|
|
ZIMV
6679
DELISTED
ZimVie
ZIMV
| $18K | ﹤0.01% |
1,679
+1,289
| +331% | +$16.9K |
|
6680
CALL
BrightSpring Health Services
BTSG
$14B
| $18K | ﹤0.01% |
1,000
+200
| +25% | +$3.93K |
|
|
SWI
6681
CALL
DELISTED
SolarWinds Corporation Common Stock
SWI
| $18K | ﹤0.01% |
+1,000
| New | +$16.8K |
|
|
ABX
6682
CALL
Abacus Global Management
ABX
$1B
| $17K | ﹤0.01% |
+2,300
| New | +$17.5K |
|
6683
PUT
Adaptive Biotechnologies
ADPT
$3.55B
| $17K | ﹤0.01% |
+2,300
| New | +$17.7K |
|
6684
Aterian
ATER
$4.01M
| $17K | ﹤0.01% |
8,445
-16,734
| -66% | -$37.3K |
|
6685
CALL
ATS Corp
ATS
$2.53B
| $17K | ﹤0.01% |
+700
| New | +$19.5K |
|
6686
PUT
Avery Dennison
AVY
$12.8B
| $17K | ﹤0.01% |
100
-500
| -83% | -$92K |
|
|
BTOP
6687
DELISTED
Bitwise Bitcoin and Ether Equal Weight Strategy ETF
BTOP
| $17K | ﹤0.01% |
690
+668
| +3,036% | +$19.7K |
|
6688
CALL
CarGurus
CARG
$3.35B
| $17K | ﹤0.01% |
600
-19,700
| -97% | -$690K |
|
6689
CBIZ
CBZ
$2.93B
| $17K | ﹤0.01% |
+236
| New | +$19K |
|
6690
PUT
Capital Group Dividend Value ETF
CGDV
$37.1B
| $17K | ﹤0.01% |
500
+200
| +67% | +$7.26K |
|
|
CIO
6691
PUT
DELISTED
City Office REIT
CIO
| $17K | ﹤0.01% |
3,300
+3,100
| +1,550% | +$15.9K |
|
6692
CALL
Clean Energy Fuels
CLNE
$418M
| $17K | ﹤0.01% |
11,600
-26,200
| -69% | -$66.6K |
|
6693
CALL
Traeger
COOK
$158M
| $17K | ﹤0.01% |
206
+176
| +587% | +$19.5K |
|
6694
Ducommun
DCO
$2.58B
| $17K | ﹤0.01% |
305
+262
| +609% | +$16.5K |
|
6695
CALL
Dyadic International
DYAI
$41.2M
| $17K | ﹤0.01% |
13,200
+1,500
| +13% | +$2.26K |
|
6696
CALL
8x8 Inc
EGHT
$269M
| $17K | ﹤0.01% |
8,900
+3,100
| +53% | +$7.99K |
|
6697
PUT
Evolent Health
EVH
$396M
| $17K | ﹤0.01% |
1,800
-55,800
| -97% | -$564K |
|
6698
PUT
Future Fuel
FF
$208M
| $17K | ﹤0.01% |
4,600
+3,600
| +360% | +$17.3K |
|
6699
PUT
Flowers Foods
FLO
$1.61B
| $17K | ﹤0.01% |
900
+800
| +800% | +$15.3K |
|
6700
CALL
Glacier Bancorp
GBCI
$6.37B
| $17K | ﹤0.01% |
400
+200
| +100% | +$9.63K |
|
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.