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 | |
|---|---|---|---|---|---|---|
5226
Sally Beauty Holdings
SBH
$1.43B
| $85K | ﹤0.01% |
9,497
-1,931
| -17% | -$19K |
|
5227
PUT
Senseonics Holdings Inc
SENS
$263M
| $85K | ﹤0.01% |
6,515
+6,005
| +1,177% | +$99.2K |
|
5228
CALL
Televisa
TV
$1.48B
| $85K | ﹤0.01% |
48,700
+22,200
| +84% | +$41.9K |
|
5229
CALL
Walker & Dunlop
WD
$1.71B
| $85K | ﹤0.01% |
1,000
-100
| -9% | -$8.95K |
|
|
JBTM
5230
PUT
JBT Marel
JBTM
$7.21B
| $85K | ﹤0.01% |
700
-12,600
| -95% | -$1.6M |
|
|
CBL
5231
CALL
DELISTED
CBL& Associates Properties, Inc.
CBL
| $85K | ﹤0.01% |
3,200
-3,700
| -54% | -$98.3K |
|
5232
PUT
AngioDynamics
ANGO
$611M
| $84K | ﹤0.01% |
9,000
+8,500
| +1,700% | +$89.3K |
|
5233
PUT
ASE Group
ASX
$77.3B
| $84K | ﹤0.01% |
9,600
-11,500
| -55% | -$117K |
|
|
AVDX
5234
PUT
DELISTED
AvidXchange
AVDX
| $84K | ﹤0.01% |
+10,000
| New | +$92.4K |
|
|
DADA
5235
DELISTED
Dada Nexus
DADA
| $84K | ﹤0.01% |
45,557
+21,905
| +93% | +$37.7K |
|
5236
PUT
Domo
DOMO
$174M
| $84K | ﹤0.01% |
10,900
-34,000
| -76% | -$272K |
|
5237
Helmerich & Payne
HP
$3.45B
| $84K | ﹤0.01% |
3,242
-3,202
| -50% | -$93.1K |
|
5238
PUT
Miller Industries
MLR
$573M
| $84K | ﹤0.01% |
+2,000
| New | +$116K |
|
|
ONTF
5239
CALL
DELISTED
ON24
ONTF
| $84K | ﹤0.01% |
16,200
+16,000
| +8,000% | +$99.2K |
|
5240
Global X US Infrastructure Development ETF
PAVE
$13.9B
| $84K | ﹤0.01% |
2,229
-363
| -14% | -$14.7K |
|
5241
PUT
Principal Financial Group
PFG
$24.3B
| $84K | ﹤0.01% |
1,000
-4,700
| -82% | -$391K |
|
5242
CALL
Rentokil
RTO
$11.8B
| $84K | ﹤0.01% |
3,700
-58,500
| -94% | -$1.41M |
|
5243
PUT
Tucows
TCX
$172M
| $84K | ﹤0.01% |
5,000
-14,600
| -74% | -$254K |
|
5244
Valmont Industries
VMI
$9.3B
| $84K | ﹤0.01% |
297
-635
| -68% | -$207K |
|
|
SOBO
5245
South Bow Corp
SOBO
$7.74B
| $84K | ﹤0.01% |
3,310
+1,402
| +73% | +$35.1K |
|
|
IELG
5246
CALL
DELISTED
ISHARES ENHANCED U.S. LARGE CAP ETF
IELG
| $84K | ﹤0.01% |
+4,100
| New | +$84K |
|
5247
CALL
AAR Corp
AIR
$5.59B
| $83K | ﹤0.01% |
1,500
-27,400
| -95% | -$1.82M |
|
5248
Ardagh Metal Packaging
AMBP
$2.83B
| $83K | ﹤0.01% |
27,739
+10,333
| +59% | +$29K |
|
5249
CALL
Chegg
CHGG
$110M
| $83K | ﹤0.01% |
130,400
+76,600
| +142% | +$94.9K |
|
5250
CALL
Dakota Gold
DC
$608M
| $83K | ﹤0.01% |
31,600
+9,400
| +42% | +$25.8K |
|
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.