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 | |
|---|---|---|---|---|---|---|
2376
Alliance Resource Partners
ARLP
$3.18B
| $1.4M | ﹤0.01% |
51,332
+36,715
| +251% | +$981K |
|
2377
Hercules Capital
HTGC
$2.94B
| $1.4M | ﹤0.01% |
+72,854
| New | +$1.47M |
|
2378
CALL
Varonis Systems
VRNS
$5.25B
| $1.4M | ﹤0.01% |
34,600
+26,500
| +327% | +$1.14M |
|
2379
PUT
Boot Barn
BOOT
$4.55B
| $1.4M | ﹤0.01% |
13,000
+600
| +5% | +$80.2K |
|
2380
PUT
Boyd Gaming
BYD
$6.47B
| $1.4M | ﹤0.01% |
21,200
-1,400
| -6% | -$103K |
|
2381
First Majestic Silver
AG
$8.05B
| $1.39M | ﹤0.01% |
208,401
-54,791
| -21% | -$326K |
|
2382
PUT
CDW
CDW
$17.1B
| $1.39M | ﹤0.01% |
8,700
-3,500
| -29% | -$636K |
|
|
HSAI
2383
CALL
Hesai Group
HSAI
$2.29B
| $1.39M | ﹤0.01% |
94,000
+58,500
| +165% | +$997K |
|
2384
NexGen Energy
NXE
$6.05B
| $1.39M | ﹤0.01% |
309,958
+164,271
| +113% | +$971K |
|
2385
PUT
Aaon
AAON
$8.41B
| $1.39M | ﹤0.01% |
17,800
+17,000
| +2,125% | +$1.75M |
|
2386
PUT
GDS Holdings
GDS
$6.34B
| $1.39M | ﹤0.01% |
54,900
+26,600
| +94% | +$806K |
|
2387
CALL
ATI
ATI
$27B
| $1.39M | ﹤0.01% |
26,700
+21,800
| +445% | +$1.24M |
|
2388
Canadian Solar
CSIQ
$906M
| $1.39M | ﹤0.01% |
160,473
-99,304
| -38% | -$1.05M |
|
2389
PUT
Owens Corning
OC
$11.5B
| $1.39M | ﹤0.01% |
9,700
-25,400
| -72% | -$4.2M |
|
2390
Vanguard Long-Term Treasury ETF
VGLT
$10.1B
| $1.39M | ﹤0.01% |
24,046
+11,704
| +95% | +$659K |
|
2391
FuboTV Inc
FUBO
$245M
| $1.38M | ﹤0.01% |
39,506
+23,786
| +151% | +$1.04M |
|
2392
CALL
Herc Holdings
HRI
$5.43B
| $1.38M | ﹤0.01% |
10,300
+8,200
| +390% | +$1.4M |
|
2393
PUT
Sterling Infrastructure
STRL
$20.3B
| $1.38M | ﹤0.01% |
12,200
+3,800
| +45% | +$535K |
|
|
XIFR
2394
XPLR Infrastructure LP
XIFR
$1.18B
| $1.38M | ﹤0.01% |
145,341
+41,812
| +40% | +$474K |
|
2395
CALL
Viasat
VSAT
$9.79B
| $1.38M | ﹤0.01% |
132,300
-75,200
| -36% | -$725K |
|
2396
CALL
Ferguson
FERG
$44.7B
| $1.38M | ﹤0.01% |
8,600
+7,600
| +760% | +$1.32M |
|
|
KALV
2397
CALL
DELISTED
KalVista Pharmaceuticals
KALV
| $1.37M | ﹤0.01% |
+119,100
| New | +$1.22M |
|
|
CMA
2398
DELISTED
Comerica
CMA
| $1.37M | ﹤0.01% |
23,232
+16,021
| +222% | +$1.01M |
|
2399
CALL
TAL Education Group
TAL
$5.71B
| $1.37M | ﹤0.01% |
103,800
-37,300
| -26% | -$465K |
|
2400
PUT
Remitly
RELY
$4.74B
| $1.37M | ﹤0.01% |
65,900
+41,600
| +171% | +$954K |
|
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.