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 | |
|---|---|---|---|---|---|---|
|
NVNO
5326
CALL
enVVeno Medical
NVNO
$7.08M
| $78K | ﹤0.01% |
849
+283
| +50% | +$31.5K |
|
5327
CALL
Oaktree Specialty Lending
OCSL
$1.02B
| $78K | ﹤0.01% |
5,100
-700
| -12% | -$11K |
|
5328
PUT
SelectQuote
SLQT
$132M
| $78K | ﹤0.01% |
23,500
+3,600
| +18% | +$15.3K |
|
5329
CALL
Woodside Energy
WDS
$44.6B
| $78K | ﹤0.01% |
5,400
-8,100
| -60% | -$123K |
|
5330
Bitdeer Technologies
BTDR
$2.56B
| $77K | ﹤0.01% |
8,796
-6,600
| -43% | -$98.6K |
|
5331
Cardlytics
CDLX
$21.7M
| $77K | ﹤0.01% |
4,237
-2,711
| -39% | -$77.4K |
|
5332
PUT
Carlyle Secured Lending
CGBD
$694M
| $77K | ﹤0.01% |
4,800
+3,700
| +336% | +$65.3K |
|
5333
Claros Mortgage Trust
CMTG
$250M
| $77K | ﹤0.01% |
20,765
+15,585
| +301% | +$53.5K |
|
|
CUK
5334
CALL
DELISTED
Carnival PLC
CUK
| $77K | ﹤0.01% |
4,400
-3,600
| -45% | -$77.6K |
|
5335
Dominion Energy
D
$60.8B
| $77K | ﹤0.01% |
+1,386
| New | +$76.2K |
|
5336
CALL
Enova International
ENVA
$6.33B
| $77K | ﹤0.01% |
800
-200
| -20% | -$20.6K |
|
5337
The Honest Company
HNST
$402M
| $77K | ﹤0.01% |
16,568
-95,349
| -85% | -$547K |
|
5338
PUT
ITT
ITT
$17.5B
| $77K | ﹤0.01% |
600
-3,500
| -85% | -$498K |
|
5339
CALL
Lazard
LAZ
$4.13B
| $77K | ﹤0.01% |
1,800
-3,100
| -63% | -$154K |
|
5340
Miller Industries
MLR
$573M
| $77K | ﹤0.01% |
+1,819
| New | +$106K |
|
5341
CALL
Meritage Homes
MTH
$4.58B
| $77K | ﹤0.01% |
1,100
+900
| +450% | +$67.6K |
|
5342
Ranpak Holdings
PACK
$439M
| $77K | ﹤0.01% |
+14,358
| New | +$94.4K |
|
|
PBPB
5343
PUT
DELISTED
Potbelly
PBPB
| $77K | ﹤0.01% |
+8,200
| New | +$90.6K |
|
5344
PUT
Sensata Technologies
ST
$6.74B
| $77K | ﹤0.01% |
3,200
| – | – |
|
5345
CALL
UroGen Pharma
URGN
$1.86B
| $77K | ﹤0.01% |
7,000
-14,700
| -68% | -$157K |
|
|
ETHD
5346
ProShares UltraShort Ether ETF
ETHD
$49.4M
| $77K | ﹤0.01% |
143
+130
| +1,000% | +$44.1K |
|
|
IWMI
5347
NEOS Russell 2000 High Income ETF
IWMI
$1.09B
| $77K | ﹤0.01% |
+1,781
| New | +$85.1K |
|
|
AIOT
5348
CALL
PowerFleet Inc
AIOT
$526M
| $77K | ﹤0.01% |
14,200
-153,600
| -92% | -$985K |
|
|
LUCK
5349
Lucky Strike Entertainment
LUCK
$914M
| $77K | ﹤0.01% |
7,963
+7,008
| +734% | +$73.4K |
|
5350
PUT
Azenta
AZTA
$1.3B
| $76K | ﹤0.01% |
2,200
+400
| +22% | +$18.4K |
|
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.