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 | |
|---|---|---|---|---|---|---|
5076
Mativ Holdings
MATV
$484M
| $98K | ﹤0.01% |
15,805
-78,465
| -83% | -$641K |
|
5077
CALL
Phunware
PHUN
$43.6M
| $98K | ﹤0.01% |
33,300
-123,200
| -79% | -$473K |
|
5078
CALL
Red Robin
RRGB
$145M
| $98K | ﹤0.01% |
27,800
-600
| -2% | -$3.07K |
|
5079
CALL
Revolve Group
RVLV
$1.81B
| $98K | ﹤0.01% |
4,600
-12,700
| -73% | -$353K |
|
|
ACCD
5080
DELISTED
Accolade Inc
ACCD
| $98K | ﹤0.01% |
14,146
-7,750
| -35% | -$51.9K |
|
5081
CALL
nLIGHT
LASR
$3.92B
| $97K | ﹤0.01% |
+12,500
| New | +$126K |
|
5082
CALL
Enpro
NPO
$6.65B
| $97K | ﹤0.01% |
600
+300
| +100% | +$53.9K |
|
5083
Omnicell
OMCL
$1.62B
| $97K | ﹤0.01% |
2,796
-1,384
| -33% | -$54.9K |
|
5084
PUT
RXO
RXO
$3.35B
| $97K | ﹤0.01% |
5,100
-4,400
| -46% | -$96.3K |
|
5085
SFL Corp
SFL
$1.63B
| $97K | ﹤0.01% |
11,896
-25,158
| -68% | -$243K |
|
5086
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.1B
| $97K | ﹤0.01% |
1,974
+411
| +26% | +$20.6K |
|
5087
Palladyne AI
PDYN
$250M
| $97K | ﹤0.01% |
+16,551
| New | +$134K |
|
5088
PUT
Aspen Aerogels
ASPN
$387M
| $96K | ﹤0.01% |
15,100
-7,600
| -33% | -$73.3K |
|
|
DCH
5089
PUT
Dauch Corp
DCH
$1.35B
| $96K | ﹤0.01% |
23,700
+16,800
| +243% | +$86.2K |
|
5090
Candel Therapeutics
CADL
$734M
| $96K | ﹤0.01% |
17,107
+12,538
| +274% | +$102K |
|
5091
Compugen
CGEN
$217M
| $96K | ﹤0.01% |
65,874
+60,343
| +1,091% | +$118K |
|
5092
PUT
Cohen & Steers
CNS
$4.2B
| $96K | ﹤0.01% |
1,200
| – | – |
|
5093
Carlisle Companies
CSL
$14.4B
| $96K | ﹤0.01% |
283
+96
| +51% | +$34.4K |
|
5094
CALL
FNB Corp
FNB
$6.75B
| $96K | ﹤0.01% |
7,200
-12,400
| -63% | -$182K |
|
5095
Unusual Whales Subversive Democratic Trading ETF
NANC
$278M
| $96K | ﹤0.01% |
2,678
-605
| -18% | -$23.4K |
|
5096
PUT
Rentokil
RTO
$11.8B
| $96K | ﹤0.01% |
4,200
-4,900
| -54% | -$118K |
|
5097
CALL
UFP Industries
UFPI
$4.89B
| $96K | ﹤0.01% |
900
-1,000
| -53% | -$112K |
|
5098
PUT
Curtiss-Wright
CW
$27B
| $95K | ﹤0.01% |
+300
| New | +$101K |
|
5099
Fossil Group
FOSL
$293M
| $95K | ﹤0.01% |
83,164
-129,698
| -61% | -$203K |
|
5100
PUT
Globus Medical
GMED
$10.8B
| $95K | ﹤0.01% |
1,300
-10,400
| -89% | -$859K |
|
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.