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 | |
|---|---|---|---|---|---|---|
4926
Vail Resorts
MTN
$5.45B
| $114K | ﹤0.01% |
+716
| New | +$119K |
|
|
PEO
4927
CALL
Adams Natural Resources Fund
PEO
$742M
| $114K | ﹤0.01% |
5,000
| – | – |
|
4928
CALL
TTM Technologies
TTMI
$12B
| $114K | ﹤0.01% |
5,600
+4,800
| +600% | +$116K |
|
4929
VinFast Auto
VFS
$7.25B
| $114K | ﹤0.01% |
36,042
+6,607
| +22% | +$24.6K |
|
|
XNET
4930
CALL
Xunlei
XNET
$360M
| $114K | ﹤0.01% |
25,600
+8,800
| +52% | +$29.4K |
|
4931
PUT
CAE Inc. Common Shares
CAE
$8.31B
| $113K | ﹤0.01% |
4,600
-100
| -2% | -$2.44K |
|
4932
CALL
Consensus Cloud Solutions
CCSI
$657M
| $113K | ﹤0.01% |
+4,900
| New | +$126K |
|
4933
Coursera
COUR
$1.51B
| $113K | ﹤0.01% |
16,985
-33,822
| -67% | -$268K |
|
|
NUVL
4934
PUT
DELISTED
Nuvalent
NUVL
| $113K | ﹤0.01% |
1,600
-200
| -11% | -$15.6K |
|
|
SRG
4935
Seritage Growth Properties
SRG
$137M
| $113K | ﹤0.01% |
+35,202
| New | +$129K |
|
4936
PUT
TransAlta
TAC
$4.06B
| $113K | ﹤0.01% |
12,100
+5,500
| +83% | +$60.9K |
|
4937
Viridian Therapeutics
VRDN
$2.2B
| $113K | ﹤0.01% |
+8,412
| New | +$143K |
|
4938
PUT
BlackSky Technology
BKSY
$919M
| $112K | ﹤0.01% |
14,500
-105,800
| -88% | -$1.33M |
|
4939
CALL
Clearfield
CLFD
$420M
| $112K | ﹤0.01% |
3,800
+2,600
| +217% | +$86.9K |
|
4940
CALL
Compass Diversified
CODI
$756M
| $112K | ﹤0.01% |
6,000
-1,200
| -17% | -$24.8K |
|
|
DAWN
4941
CALL
DELISTED
Day One Biopharmaceuticals
DAWN
| $112K | ﹤0.01% |
14,200
-4,300
| -23% | -$46.3K |
|
4942
PUT
The Greenbrier Companies
GBX
$1.52B
| $112K | ﹤0.01% |
2,200
+200
| +10% | +$11.9K |
|
4943
PUT
International Seaways
INSW
$4.71B
| $112K | ﹤0.01% |
3,400
-400
| -11% | -$14.6K |
|
4944
CALL
NB Bancorp
NBBK
$996M
| $112K | ﹤0.01% |
6,200
+1,900
| +44% | +$35.3K |
|
|
ORGN
4945
CALL
DELISTED
Origin Materials
ORGN
| $112K | ﹤0.01% |
5,653
+2,696
| +91% | +$74.1K |
|
4946
PUT
Trinity Capital Inc.
TRIN
$1.56B
| $112K | ﹤0.01% |
7,400
-5,600
| -43% | -$87K |
|
4947
PUT
Universal Corp
UVV
$1.33B
| $112K | ﹤0.01% |
2,000
+1,300
| +186% | +$69.3K |
|
|
SUNS
4948
CALL
Sunrise Realty Trust
SUNS
$108M
| $112K | ﹤0.01% |
+10,200
| New | +$123K |
|
4949
PUT
Compugen
CGEN
$220M
| $111K | ﹤0.01% |
76,300
+66,900
| +712% | +$131K |
|
|
FINV
4950
CALL
FinVolution Group
FINV
$1.15B
| $111K | ﹤0.01% |
11,600
-16,200
| -58% | -$133K |
|
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.