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 | |
|---|---|---|---|---|---|---|
2251
BHP
BHP
$213B
| $1.58M | ﹤0.01% |
32,628
+1,491
| +5% | +$74.2K |
|
2252
B2Gold
BTG
$5.16B
| $1.58M | ﹤0.01% |
555,671
+418,641
| +306% | +$1.12M |
|
2253
CALL
Kanzhun
BZ
$6.89B
| $1.58M | ﹤0.01% |
82,600
+34,400
| +71% | +$560K |
|
2254
Tapestry
TPR
$28.8B
| $1.58M | ﹤0.01% |
22,489
-44,939
| -67% | -$3.4M |
|
2255
PUT
LCI Industries
LCII
$2.51B
| $1.58M | ﹤0.01% |
18,100
+17,500
| +2,917% | +$1.76M |
|
|
HSAI
2256
PUT
Hesai Group
HSAI
$2.29B
| $1.58M | ﹤0.01% |
106,800
+20,400
| +24% | +$348K |
|
2257
CALL
Iridium Communications
IRDM
$4.85B
| $1.57M | ﹤0.01% |
57,600
+34,800
| +153% | +$1.02M |
|
2258
Patterson-UTI
PTEN
$3.87B
| $1.57M | ﹤0.01% |
191,387
-13,409
| -7% | -$113K |
|
2259
PUT
Alexandria Real Estate Equities
ARE
$8.88B
| $1.57M | ﹤0.01% |
17,000
-38,300
| -69% | -$3.75M |
|
2260
CALL
Iovance Biotherapeutics
IOVA
$2.23B
| $1.57M | ﹤0.01% |
470,800
-196,300
| -29% | -$1.01M |
|
2261
Crane Co
CR
$13.1B
| $1.56M | ﹤0.01% |
10,223
+7,185
| +237% | +$1.15M |
|
2262
PUT
Harmony Gold Mining
HMY
$9.92B
| $1.56M | ﹤0.01% |
106,000
+37,300
| +54% | +$416K |
|
2263
CALL
Denison Mines
DNN
$2.63B
| $1.56M | ﹤0.01% |
1,203,400
+238,900
| +25% | +$399K |
|
|
SEI
2264
PUT
Solaris Energy Infrastructure
SEI
$3.31B
| $1.56M | ﹤0.01% |
71,800
+71,200
| +11,867% | +$1.97M |
|
|
SGI
2265
PUT
Somnigroup International
SGI
$15.1B
| $1.56M | ﹤0.01% |
26,100
-52,900
| -67% | -$3.2M |
|
2266
PUT
Sphere Entertainment
SPHR
$4.88B
| $1.56M | ﹤0.01% |
47,700
+12,100
| +34% | +$492K |
|
|
DESP
2267
CALL
DELISTED
Despegar.com
DESP
| $1.56M | ﹤0.01% |
83,000
+40,200
| +94% | +$772K |
|
2268
PUT
NexGen Energy
NXE
$6.05B
| $1.56M | ﹤0.01% |
347,100
+295,000
| +566% | +$1.74M |
|
|
2269
CALL
LCI Industries
LCII
$2.51B
| $1.56M | ﹤0.01% |
+17,800
| New | +$1.79M |
|
|
HAPN
2270
CALL
Happen Inc
HAPN
$2.08B
| $1.55M | ﹤0.01% |
150,400
-99,500
| -40% | -$1.33M |
|
|
SEE
2271
CALL
DELISTED
Sealed Air
SEE
| $1.55M | ﹤0.01% |
53,700
+23,000
| +75% | +$753K |
|
2272
CALL
Shake Shack
SHAK
$2.3B
| $1.55M | ﹤0.01% |
17,600
-29,400
| -63% | -$3.19M |
|
|
MSTX
2273
Defiance Daily Target 2x Long MSTR ETF
MSTX
$149M
| $1.55M | ﹤0.01% |
6,012
-63,723
| -91% | -$24.2M |
|
2274
CALL
Vista Energy
VIST
$7.75B
| $1.55M | ﹤0.01% |
33,300
+17,200
| +107% | +$890K |
|
|
CWAN
2275
PUT
DELISTED
Clearwater Analytics
CWAN
| $1.55M | ﹤0.01% |
57,800
+57,700
| +57,700% | +$1.62M |
|
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.