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 | |
|---|---|---|---|---|---|---|
2976
PUT
Avantor
AVTR
$7.81B
| $753K | ﹤0.01% |
46,500
-35,900
| -44% | -$680K |
|
|
GES
2977
CALL
DELISTED
Guess Inc
GES
| $752K | ﹤0.01% |
68,000
-19,500
| -22% | -$235K |
|
2978
Essential Utilities
WTRG
$11.2B
| $752K | ﹤0.01% |
+19,031
| New | +$699K |
|
2979
PUT
Guidewire Software
GWRE
$11.5B
| $749K | ﹤0.01% |
4,000
-10,300
| -72% | -$2M |
|
2980
Winnebago Industries
WGO
$870M
| $749K | ﹤0.01% |
+21,755
| New | +$922K |
|
|
DFTX
2981
CALL
Definium Therapeutics
DFTX
$5.73B
| $748K | ﹤0.01% |
128,000
-36,900
| -22% | -$264K |
|
2982
CALL
Progyny
PGNY
$2.44B
| $746K | ﹤0.01% |
33,400
+13,200
| +65% | +$284K |
|
2983
PUT
CBRE Group
CBRE
$40.8B
| $745K | ﹤0.01% |
5,700
-16,800
| -75% | -$2.28M |
|
2984
PUT
Verisk Analytics
VRSK
$26.4B
| $744K | ﹤0.01% |
2,500
-2,700
| -52% | -$778K |
|
2985
CALL
Planet Labs
PL
$7.3B
| $742K | ﹤0.01% |
219,700
-126,500
| -37% | -$592K |
|
2986
Transocean
RIG
$5.92B
| $742K | ﹤0.01% |
234,230
-60,330
| -20% | -$212K |
|
2987
Fidelity National Information Services
FIS
$21.5B
| $741K | ﹤0.01% |
+9,923
| New | +$746K |
|
2988
CALL
Axogen
AXGN
$2.1B
| $740K | ﹤0.01% |
40,000
+2,700
| +7% | +$48.7K |
|
2989
Upwork
UPWK
$1.09B
| $740K | ﹤0.01% |
56,719
-46,670
| -45% | -$711K |
|
2990
CALL
Vishay Intertechnology
VSH
$5.86B
| $740K | ﹤0.01% |
46,600
+24,100
| +107% | +$413K |
|
2991
PUT
Element Solutions
ESI
$9.12B
| $739K | ﹤0.01% |
32,700
+21,300
| +187% | +$544K |
|
2992
PUT
Universal Display
OLED
$3.71B
| $739K | ﹤0.01% |
5,300
-16,600
| -76% | -$2.48M |
|
2993
Vital Farms
VITL
$558M
| $739K | ﹤0.01% |
24,254
-10,021
| -29% | -$361K |
|
2994
PTC
PTC
$13.7B
| $738K | ﹤0.01% |
4,765
+3,630
| +320% | +$624K |
|
2995
PUT
Capricor Therapeutics
CAPR
$1.14B
| $736K | ﹤0.01% |
77,600
-32,800
| -30% | -$455K |
|
2996
CALL
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $735K | ﹤0.01% |
27,900
-74,900
| -73% | -$2.05M |
|
2997
CALL
ODDITY Tech
ODD
$708M
| $735K | ﹤0.01% |
17,000
+10,300
| +154% | +$458K |
|
|
BRSL
2998
Brightstar Lottery PLC
BRSL
$1.91B
| $733K | ﹤0.01% |
+45,098
| New | +$778K |
|
2999
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $732K | ﹤0.01% |
5,900
+3,300
| +127% | +$431K |
|
|
3000
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $732K | ﹤0.01% |
5,900
+5,200
| +743% | +$678K |
|
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.