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 | |
|---|---|---|---|---|---|---|
2701
CALL
GCM Grosvenor
GCMG
$737M
| $1.01M | ﹤0.01% |
76,200
+500
| +0.7% | +$6.68K |
|
|
SNDK
2702
Sandisk
SNDK
$213B
| $1.01M | ﹤0.01% |
+21,153
| New | +$1.05M |
|
2703
PUT
Ambev
ABEV
$47.3B
| $1.01M | ﹤0.01% |
431,800
+62,300
| +17% | +$125K |
|
2704
CALL
Cognex
CGNX
$10.3B
| $1M | ﹤0.01% |
33,700
+32,700
| +3,270% | +$1.15M |
|
2705
Intellia Therapeutics
NTLA
$1.5B
| $1M | ﹤0.01% |
141,267
+30,736
| +28% | +$310K |
|
2706
Velocity Financial
VEL
$683M
| $1M | ﹤0.01% |
53,545
+34,977
| +188% | +$658K |
|
2707
PUT
Upwork
UPWK
$1.09B
| $1M | ﹤0.01% |
76,700
-52,500
| -41% | -$800K |
|
2708
-1x Short VIX Futures ETF
SVIX
$182M
| $997K | ﹤0.01% |
49,051
+47,126
| +2,448% | +$1.14M |
|
2709
Western Midstream Partners
WES
$19.6B
| $997K | ﹤0.01% |
+24,357
| New | +$992K |
|
2710
CALL
Graphic Packaging
GPK
$3.26B
| $996K | ﹤0.01% |
38,400
+21,800
| +131% | +$583K |
|
2711
PUT
Grab
GRAB
$13.5B
| $994K | ﹤0.01% |
219,600
+83,100
| +61% | +$388K |
|
2712
CALL
Canadian Solar
CSIQ
$906M
| $992K | ﹤0.01% |
114,700
+12,100
| +12% | +$127K |
|
2713
PUT
Array Technologies
ARRY
$818M
| $991K | ﹤0.01% |
203,600
+141,500
| +228% | +$911K |
|
2714
PUT
Hexcel
HXL
$8.32B
| $991K | ﹤0.01% |
18,100
+16,400
| +965% | +$1.02M |
|
2715
CALL
Xponential Fitness
XPOF
$265M
| $991K | ﹤0.01% |
119,000
-83,000
| -41% | -$1.16M |
|
2716
CALL
Tilray
TLRY
$479M
| $990K | ﹤0.01% |
150,590
-126,700
| -46% | -$1.17M |
|
2717
UBS Group
UBS
$170B
| $988K | ﹤0.01% |
+32,263
| New | +$1.08M |
|
2718
HF Sinclair
DINO
$15.9B
| $987K | ﹤0.01% |
30,036
+13,743
| +84% | +$482K |
|
|
CWAN
2719
CALL
DELISTED
Clearwater Analytics
CWAN
| $986K | ﹤0.01% |
+36,800
| New | +$1.03M |
|
2720
Ecolab
ECL
$75.6B
| $986K | ﹤0.01% |
3,892
+3,044
| +359% | +$767K |
|
|
CKPT
2721
CALL
DELISTED
Checkpoint Therapeutics
CKPT
| $982K | ﹤0.01% |
243,200
-48,300
| -17% | -$161K |
|
2722
PUT
Icahn Enterprises
IEP
$5.17B
| $981K | ﹤0.01% |
108,300
-93,700
| -46% | -$902K |
|
|
PBT
2723
CALL
Permian Basin Royalty Trust
PBT
$1.36B
| $981K | ﹤0.01% |
99,000
-3,000
| -3% | -$32.5K |
|
2724
CALL
Sabre
SABR
$656M
| $981K | ﹤0.01% |
349,300
-162,900
| -32% | -$577K |
|
2725
PUT
Vipshop
VIPS
$6.84B
| $980K | ﹤0.01% |
62,500
-128,000
| -67% | -$1.93M |
|
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.