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 | |
|---|---|---|---|---|---|---|
4351
PUT
Aemetis
AMTX
$99.2M
| $194K | ﹤0.01% |
111,700
+37,900
| +51% | +$81K |
|
4352
PUT
Black Hills Corp
BKH
$5.55B
| $194K | ﹤0.01% |
3,200
+2,300
| +256% | +$136K |
|
4353
Core Laboratories
CLB
$455M
| $194K | ﹤0.01% |
12,946
+12,587
| +3,506% | +$211K |
|
4354
PUT
EyePoint Inc
EYPT
$999M
| $194K | ﹤0.01% |
35,800
-4,000
| -10% | -$28K |
|
4355
CALL
NerdWallet
NRDS
$632M
| $194K | ﹤0.01% |
21,500
+5,200
| +32% | +$62.3K |
|
4356
Telephone and Data Systems
TDS
$3.87B
| $194K | ﹤0.01% |
5,011
-23,941
| -83% | -$862K |
|
|
MRX
4357
CALL
Marex Group Limited Ordinary Shares
MRX
$4.54B
| $194K | ﹤0.01% |
+5,500
| New | +$191K |
|
4358
PUT
Barings BDC
BBDC
$869M
| $193K | ﹤0.01% |
20,300
+18,700
| +1,169% | +$184K |
|
4359
PUT
Banco Bilbao Vizcaya Argentaria
BBVA
$142B
| $193K | ﹤0.01% |
14,200
+11,500
| +426% | +$143K |
|
4360
PUT
Eastman Chemical
EMN
$7.69B
| $193K | ﹤0.01% |
2,200
-2,100
| -49% | -$198K |
|
4361
Ero Copper
ERO
$2.64B
| $193K | ﹤0.01% |
15,993
+1,569
| +11% | +$20.9K |
|
4362
Kinsale Capital Group
KNSL
$8.58B
| $193K | ﹤0.01% |
+397
| New | +$178K |
|
4363
CALL
Gibraltar Industries
ROCK
$1.28B
| $193K | ﹤0.01% |
+3,300
| New | +$205K |
|
|
ONIT
4364
PUT
Onity Group
ONIT
$342M
| $193K | ﹤0.01% |
6,000
+4,100
| +216% | +$136K |
|
4365
Cars.com
CARS
$722M
| $192K | ﹤0.01% |
17,065
+1,303
| +8% | +$19.8K |
|
4366
CALL
Frontdoor
FTDR
$5.27B
| $192K | ﹤0.01% |
5,000
+3,200
| +178% | +$163K |
|
4367
PUT
Helen of Troy
HELE
$656M
| $192K | ﹤0.01% |
3,600
-26,600
| -88% | -$1.54M |
|
|
KC
4368
Kingsoft Cloud Holdings
KC
$2.96B
| $192K | ﹤0.01% |
13,390
-80,216
| -86% | -$1.2M |
|
|
PPTA
4369
PUT
Perpetua Resources
PPTA
$2.16B
| $192K | ﹤0.01% |
18,000
+9,900
| +122% | +$106K |
|
4370
Rayonier Advanced Materials
RYAM
$562M
| $192K | ﹤0.01% |
33,502
+5,705
| +21% | +$40.1K |
|
|
ZH
4371
CALL
Zhihu
ZH
$287M
| $192K | ﹤0.01% |
45,100
+37,000
| +457% | +$161K |
|
4372
PUT
Elbit Systems
ESLT
$36B
| $191K | ﹤0.01% |
500
+400
| +400% | +$129K |
|
|
GB
4373
PUT
DELISTED
Global Blue Group Holding
GB
| $191K | ﹤0.01% |
26,000
| – | – |
|
4374
PUT
Gates Industrial Corporation Ltd.
GTES
$6.31B
| $191K | ﹤0.01% |
10,400
+5,700
| +121% | +$118K |
|
4375
CALL
Inseego
INSG
$104M
| $191K | ﹤0.01% |
23,500
-1,900
| -7% | -$20.8K |
|
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.