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 | |
|---|---|---|---|---|---|---|
|
WOW
4301
DELISTED
WideOpenWest
WOW
| $204K | ﹤0.01% |
+41,374
| New | +$190K |
|
|
AIOT
4302
PowerFleet Inc
AIOT
$537M
| $204K | ﹤0.01% |
+37,275
| New | +$239K |
|
4303
PUT
Huntsman Corp
HUN
$2.1B
| $203K | ﹤0.01% |
12,900
-900
| -7% | -$15.3K |
|
4304
CALL
RadNet
RDNT
$4.98B
| $203K | ﹤0.01% |
4,100
+3,300
| +413% | +$195K |
|
|
4305
PUT
RadNet
RDNT
$4.98B
| $203K | ﹤0.01% |
4,100
+4,000
| +4,000% | +$237K |
|
4306
Ryan Specialty Holdings
RYAN
$6.02B
| $203K | ﹤0.01% |
2,753
-5,377
| -66% | -$365K |
|
4307
CALL
Valley National Bancorp
VLY
$7.9B
| $203K | ﹤0.01% |
22,900
-11,500
| -33% | -$109K |
|
4308
CALL
Watsco Inc
WSO
$13.2B
| $203K | ﹤0.01% |
400
-1,600
| -80% | -$789K |
|
|
BORR
4309
Borr Drilling
BORR
$1.19B
| $202K | ﹤0.01% |
92,273
-75,519
| -45% | -$227K |
|
|
HELP
4310
CALL
Cybin Inc
HELP
$490M
| $202K | ﹤0.01% |
32,000
-4,500
| -12% | -$39K |
|
4311
PUT
Denison Mines
DNN
$2.43B
| $202K | ﹤0.01% |
156,100
-171,800
| -52% | -$287K |
|
4312
CALL
Gaotu Techedu
GOTU
$405M
| $202K | ﹤0.01% |
62,300
-52,300
| -46% | -$144K |
|
4313
CALL
NatWest
NWG
$69.9B
| $202K | ﹤0.01% |
17,000
+10,000
| +143% | +$112K |
|
4314
REX American Resources
REX
$1.39B
| $202K | ﹤0.01% |
10,804
+10,740
| +16,781% | +$216K |
|
4315
PUT
Sky Harbour Group
SKYH
$363M
| $202K | ﹤0.01% |
15,600
+1,100
| +8% | +$12.3K |
|
4316
Woodward
WWD
$23B
| $202K | ﹤0.01% |
+1,111
| New | +$205K |
|
4317
CALL
ProFrac Holding
ACDC
$653M
| $201K | ﹤0.01% |
26,600
+4,800
| +22% | +$36.9K |
|
4318
CALL
Appian
APPN
$2.11B
| $201K | ﹤0.01% |
7,000
-5,000
| -42% | -$164K |
|
4319
CALL
Barings BDC
BBDC
$869M
| $201K | ﹤0.01% |
21,100
+17,800
| +539% | +$176K |
|
4320
Open Text
OTEX
$6.28B
| $201K | ﹤0.01% |
+7,976
| New | +$219K |
|
4321
PUT
Sonos
SONO
$2.09B
| $201K | ﹤0.01% |
18,900
-20,100
| -52% | -$264K |
|
4322
ProShares UltraShort Real Estate
SRS
$14.8M
| $201K | ﹤0.01% |
4,160
+3,967
| +2,055% | +$197K |
|
|
TGB
4323
CALL
Trekor Metals
TGB
$2.45B
| $201K | ﹤0.01% |
90,100
+24,600
| +38% | +$52.2K |
|
4324
VEON
VEON
$3.5B
| $201K | ﹤0.01% |
4,631
-456
| -9% | -$20.3K |
|
4325
CALL
CG Oncology
CGON
$6.1B
| $200K | ﹤0.01% |
8,200
+600
| +8% | +$16.9K |
|
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.