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 | |
|---|---|---|---|---|---|---|
5901
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.4B
| $44K | ﹤0.01% |
1,649
-410
| -20% | -$10.9K |
|
5902
ProShares Ultra Real Estate
URE
$58.4M
| $44K | ﹤0.01% |
681
+388
| +132% | +$25.2K |
|
5903
PUT
Vir Biotechnology
VIR
$1.48B
| $44K | ﹤0.01% |
6,900
-74,400
| -92% | -$662K |
|
5904
PUT
Vuzix
VUZI
$197M
| $44K | ﹤0.01% |
21,700
-8,400
| -28% | -$27.5K |
|
|
ZYXI
5905
DELISTED
Zynex
ZYXI
| $44K | ﹤0.01% |
20,385
+19,031
| +1,406% | +$124K |
|
|
ARDT
5906
PUT
Ardent Health
ARDT
$1.5B
| $44K | ﹤0.01% |
+3,200
| New | +$46.7K |
|
|
GOLD
5907
PUT
Gold.com Inc
GOLD
$1.18B
| $43K | ﹤0.01% |
1,700
-3,000
| -64% | -$83K |
|
5908
CALL
Arcos Dorados Holdings
ARCO
$1.72B
| $43K | ﹤0.01% |
5,400
+5,200
| +2,600% | +$41K |
|
5909
PUT
Chefs' Warehouse
CHEF
$4.53B
| $43K | ﹤0.01% |
800
+500
| +167% | +$27.9K |
|
5910
PUT
Galectin Therapeutics
GALT
$205M
| $43K | ﹤0.01% |
35,400
-396,800
| -92% | -$557K |
|
|
LKFT
5911
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.8B
| $43K | ﹤0.01% |
+1,724
| New | +$43.6K |
|
5912
PUT
Hamilton Insurance Group
HG
$3.53B
| $43K | ﹤0.01% |
2,100
+1,100
| +110% | +$21.5K |
|
5913
PUT
Healthcare Realty
HR
$7.31B
| $43K | ﹤0.01% |
2,600
+1,300
| +100% | +$21.6K |
|
5914
PUT
Heron Therapeutics
HRTX
$91.6M
| $43K | ﹤0.01% |
19,800
+10,100
| +104% | +$19.6K |
|
5915
CALL
Hycroft Mining Holding Corp
HYMC
$1.79B
| $43K | ﹤0.01% |
13,500
-493,600
| -97% | -$1.27M |
|
5916
CALL
Imperial Oil
IMO
$61.7B
| $43K | ﹤0.01% |
600
+300
| +100% | +$20.6K |
|
5917
CALL
Inter&Co
INTR
$2.47B
| $43K | ﹤0.01% |
8,000
+7,700
| +2,567% | +$40K |
|
5918
PUT
Ituran Location and Control
ITRN
$1.11B
| $43K | ﹤0.01% |
+1,200
| New | +$43.3K |
|
5919
CALL
LENSAR
LNSR
$64.1M
| $43K | ﹤0.01% |
+3,100
| New | +$35.6K |
|
5920
CALL
Mercer International
MERC
$39M
| $43K | ﹤0.01% |
7,000
-50,300
| -88% | -$338K |
|
|
NVNO
5921
PUT
enVVeno Medical
NVNO
$7.1M
| $43K | ﹤0.01% |
477
+34
| +8% | +$3.79K |
|
5922
CALL
Penske Automotive Group
PAG
$14.2B
| $43K | ﹤0.01% |
300
+100
| +50% | +$16K |
|
5923
CALL
Pulse Biosciences
PLSE
$2.42B
| $43K | ﹤0.01% |
2,700
-800
| -23% | -$14.9K |
|
5924
CALL
Rockwell Medical
RMTI
$28M
| $43K | ﹤0.01% |
3,850
-3,670
| -49% | -$66.6K |
|
5925
Saic
SAIC
$4.91B
| $43K | ﹤0.01% |
386
-4,837
| -93% | -$522K |
|
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.