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 | |
|---|---|---|---|---|---|---|
5301
CALL
VinFast Auto
VFS
$7.28B
| $80K | ﹤0.01% |
25,200
-97,100
| -79% | -$361K |
|
5302
PUT
AdvanSix
ASIX
$541M
| $79K | ﹤0.01% |
+3,500
| New | +$97.4K |
|
5303
ASE Group
ASX
$77.3B
| $79K | ﹤0.01% |
9,063
-9,710
| -52% | -$98.7K |
|
5304
Butterfly Network
BFLY
$1.89B
| $79K | ﹤0.01% |
34,729
-62,389
| -64% | -$223K |
|
|
CPRX
5305
DELISTED
Catalyst Pharmaceutical
CPRX
| $79K | ﹤0.01% |
+3,261
| New | +$73.4K |
|
5306
PUT
Cardiff Oncology
CRDF
$66.5M
| $79K | ﹤0.01% |
25,300
-16,400
| -39% | -$64.9K |
|
5307
PUT
Cousins Properties
CUZ
$5.19B
| $79K | ﹤0.01% |
2,700
+900
| +50% | +$26.9K |
|
|
DDL
5308
CALL
Dingdong
DDL
$562M
| $79K | ﹤0.01% |
29,500
-4,200
| -12% | -$13.7K |
|
|
DVAX
5309
PUT
DELISTED
Dynavax Technologies
DVAX
| $79K | ﹤0.01% |
6,100
-20,200
| -77% | -$267K |
|
5310
PUT
Goldman Sachs BDC
GSBD
$969M
| $79K | ﹤0.01% |
6,800
-9,800
| -59% | -$123K |
|
5311
PUT
Kulicke & Soffa
KLIC
$4.67B
| $79K | ﹤0.01% |
2,400
-5,200
| -68% | -$213K |
|
5312
CALL
OneWater Marine
ONEW
$204M
| $79K | ﹤0.01% |
4,900
+4,600
| +1,533% | +$78.7K |
|
5313
PUT
PROG Holdings
PRG
$1.75B
| $79K | ﹤0.01% |
3,000
+1,400
| +88% | +$49.5K |
|
5314
CALL
SPS Commerce
SPSC
$2.64B
| $79K | ﹤0.01% |
600
-100
| -14% | -$15.7K |
|
5315
CALL
Talos Energy
TALO
$2.53B
| $79K | ﹤0.01% |
8,200
-59,400
| -88% | -$563K |
|
|
SOBO
5316
PUT
South Bow Corp
SOBO
$7.74B
| $79K | ﹤0.01% |
3,100
+500
| +19% | +$12.5K |
|
5317
CALL
Aaon
AAON
$7.3B
| $78K | ﹤0.01% |
1,000
+600
| +150% | +$61.9K |
|
5318
PUT
Angi Inc
ANGI
$229M
| $78K | ﹤0.01% |
5,100
+4,630
| +985% | +$78.9K |
|
5319
AngioDynamics
ANGO
$611M
| $78K | ﹤0.01% |
8,405
+1,600
| +24% | +$16.8K |
|
5320
PUT
Arcturus Therapeutics
ARCT
$164M
| $78K | ﹤0.01% |
7,400
+4,100
| +124% | +$65.1K |
|
5321
Ceragon Networks
CRNT
$197M
| $78K | ﹤0.01% |
33,552
-12,299
| -27% | -$45.1K |
|
5322
CALL
China Yuchai International
CYD
$1.77B
| $78K | ﹤0.01% |
+4,600
| New | +$70.6K |
|
5323
REX FANG & Innovation Equity Premium Income ETF
FEPI
$648M
| $78K | ﹤0.01% |
+1,880
| New | +$88.6K |
|
5324
Group 1 Automotive
GPI
$3.42B
| $78K | ﹤0.01% |
206
-7,261
| -97% | -$3.18M |
|
|
KW
5325
CALL
DELISTED
Kennedy-Wilson Holdings
KW
| $78K | ﹤0.01% |
9,000
+1,700
| +23% | +$15.5K |
|
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.