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 | |
|---|---|---|---|---|---|---|
2726
CALL
ASP Isotopes
ASPI
$487M
| $978K | ﹤0.01% |
208,600
+154,100
| +283% | +$769K |
|
2727
Vanguard High Dividend Yield ETF
VYM
$81.1B
| $978K | ﹤0.01% |
+7,586
| New | +$993K |
|
2728
CALL
Blue Bird Corp
BLBD
$2.41B
| $977K | ﹤0.01% |
30,200
+6,000
| +25% | +$219K |
|
2729
The GEO Group
GEO
$4.13B
| $977K | ﹤0.01% |
33,478
-6,571
| -16% | -$188K |
|
2730
Atmos Energy
ATO
$29.9B
| $976K | ﹤0.01% |
6,315
+5,618
| +806% | +$820K |
|
2731
Nucor
NUE
$56.4B
| $969K | ﹤0.01% |
+8,059
| New | +$1.04M |
|
2732
Trump Media & Technology Group
DJT
$2.37B
| $969K | ﹤0.01% |
49,618
-105,415
| -68% | -$2.96M |
|
2733
CALL
Camping World
CWH
$363M
| $967K | ﹤0.01% |
59,900
+7,800
| +15% | +$159K |
|
2734
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$3.42B
| $967K | ﹤0.01% |
+7,343
| New | +$985K |
|
2735
PUT
Arthur J. Gallagher & Co
AJG
$63.7B
| $966K | ﹤0.01% |
2,800
-30,300
| -92% | -$9.57M |
|
2736
Equinox Gold
EQX
$7.32B
| $964K | ﹤0.01% |
+140,139
| New | +$898K |
|
2737
PUT
Magnite
MGNI
$2.65B
| $964K | ﹤0.01% |
84,500
-4,600
| -5% | -$73.3K |
|
|
TXNM
2738
CALL
TXNM Energy Inc
TXNM
$6.47B
| $962K | ﹤0.01% |
18,000
+14,100
| +362% | +$708K |
|
2739
PUT
OptimizeRx
OPRX
$117M
| $961K | ﹤0.01% |
111,000
+40,900
| +58% | +$250K |
|
|
AMTM
2740
Amentum Holdings
AMTM
$5.51B
| $961K | ﹤0.01% |
52,827
-167,154
| -76% | -$3.4M |
|
2741
CALL
Dorchester Minerals
DMLP
$1.34B
| $959K | ﹤0.01% |
31,900
+22,000
| +222% | +$692K |
|
2742
PUT
Chord Energy
CHRD
$7.79B
| $958K | ﹤0.01% |
8,500
-3,900
| -31% | -$443K |
|
2743
Varonis Systems
VRNS
$5.25B
| $955K | ﹤0.01% |
23,621
+18,301
| +344% | +$787K |
|
2744
PUT
Immersion
IMMR
$216M
| $954K | ﹤0.01% |
125,900
+110,600
| +723% | +$907K |
|
2745
STMicroelectronics
STM
$46B
| $952K | ﹤0.01% |
+43,356
| New | +$1.07M |
|
2746
CALL
LGI Homes
LGIH
$1.4B
| $950K | ﹤0.01% |
14,300
+12,500
| +694% | +$1.01M |
|
2747
CALL
Winnebago Industries
WGO
$870M
| $947K | ﹤0.01% |
27,500
+1,500
| +6% | +$63.6K |
|
2748
PUT
Cincinnati Financial
CINF
$28.3B
| $945K | ﹤0.01% |
6,400
+6,300
| +6,300% | +$887K |
|
2749
Centrus Energy
LEU
$3.22B
| $945K | ﹤0.01% |
15,204
+2,701
| +22% | +$228K |
|
|
LOGC
2750
CALL
DELISTED
ContextLogic
LOGC
| $944K | ﹤0.01% |
135,300
-73,700
| -35% | -$549K |
|
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.