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 | |
|---|---|---|---|---|---|---|
7076
CALL
Fossil Group
FOSL
$249M
| $10K | ﹤0.01% |
9,300
+3,800
| +69% | +$5.96K |
|
7077
CALL
Gladstone Capital
GLAD
$430M
| $10K | ﹤0.01% |
400
-1,300
| -76% | -$37.1K |
|
7078
PUT
Genelux
GNLX
$132M
| $10K | ﹤0.01% |
+4,000
| New | +$15K |
|
7079
PUT
Goldgroup Mining Inc.
GORO
$162M
| $10K | ﹤0.01% |
+20,200
| New | +$8.38K |
|
7080
CALL
Grove Collaborative
GROV
$45.8M
| $10K | ﹤0.01% |
7,600
-4,300
| -36% | -$6.64K |
|
7081
PUT
Hain Celestial
HAIN
$46M
| $10K | ﹤0.01% |
2,600
+1,900
| +271% | +$8.49K |
|
7082
CALL
Holley
HLLY
$319M
| $10K | ﹤0.01% |
3,900
+300
| +8% | +$842 |
|
7083
PUT
Hyliion Holdings
HYLN
$681M
| $10K | ﹤0.01% |
7,400
+1,600
| +28% | +$3.17K |
|
7084
iShares Self-Driving EV and Tech ETF
IDRV
$124M
| $10K | ﹤0.01% |
+368
| New | +$11.2K |
|
7085
CALL
IDT Corp
IDT
$1.63B
| $10K | ﹤0.01% |
200
-3,000
| -94% | -$145K |
|
7086
PUT
Immunic
IMUX
$188M
| $10K | ﹤0.01% |
960
-2,040
| -68% | -$22K |
|
7087
Inogen
INGN
$171M
| $10K | ﹤0.01% |
+1,519
| New | +$14.3K |
|
|
HYFT
7088
CALL
MindWalk Holdings
HYFT
$67.3M
| $10K | ﹤0.01% |
+28,300
| New | +$12.7K |
|
|
JHG
7089
CALL
DELISTED
Janus Henderson
JHG
| $10K | ﹤0.01% |
300
+200
| +200% | +$8.24K |
|
|
NXDR
7090
Nextdoor Holdings
NXDR
$870M
| $10K | ﹤0.01% |
6,812
-4,621
| -40% | -$10.3K |
|
7091
Kamada
KMDA
$403M
| $10K | ﹤0.01% |
1,664
+27
| +2% | +$192 |
|
7092
KraneShares Hang Seng TECH Index ETF
KTEC
$57.7M
| $10K | ﹤0.01% |
658
-1,841
| -74% | -$28.9K |
|
7093
PUT
MidCap Financial Investment
MFIC
$790M
| $10K | ﹤0.01% |
800
-6,900
| -90% | -$93.8K |
|
7094
PUT
Merit Medical Systems
MMSI
$4.54B
| $10K | ﹤0.01% |
+100
| New | +$10.3K |
|
7095
Madison Square Garden
MSGS
$9.57B
| $10K | ﹤0.01% |
55
-1,840
| -97% | -$380K |
|
7096
PUT
MACOM Technology Solutions
MTSI
$20.1B
| $10K | ﹤0.01% |
100
| – | – |
|
7097
PUT
Mueller Water Products
MWA
$3.94B
| $10K | ﹤0.01% |
+400
| New | +$10K |
|
|
NEWP
7098
PUT
New Pacific Metals
NEWP
$855M
| $10K | ﹤0.01% |
9,100
-1,100
| -11% | -$1.31K |
|
7099
CALL
Nu Skin
NUS
$250M
| $10K | ﹤0.01% |
1,400
+100
| +8% | +$727 |
|
7100
PUT
Offerpad Solutions
OPAD
$20.1M
| $10K | ﹤0.01% |
+660
| New | +$14.4K |
|
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.