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 | |
|---|---|---|---|---|---|---|
1876
PUT
Schwab US Broad Market ETF
SCHB
$42.8B
| $2.39M | ﹤0.01% |
87,300
-149,500
| -63% | -$3.4M |
|
|
SEI
1877
CALL
Solaris Energy Infrastructure
SEI
$3.31B
| $2.39M | ﹤0.01% |
109,900
+102,500
| +1,385% | +$2.84M |
|
|
AMTM
1878
CALL
Amentum Holdings
AMTM
$5.51B
| $2.39M | ﹤0.01% |
131,300
+18,600
| +17% | +$379K |
|
|
JNPR
1879
CALL
DELISTED
Juniper Networks
JNPR
| $2.39M | ﹤0.01% |
66,000
-100
| -0.2% | -$3.66K |
|
1880
PUT
GoDaddy
GDDY
$12.3B
| $2.38M | ﹤0.01% |
13,200
-1,900
| -13% | -$363K |
|
1881
e.l.f. Beauty
ELF
$4.56B
| $2.38M | ﹤0.01% |
+37,840
| New | +$3.3M |
|
1882
CALL
PagSeguro Digital
PAGS
$2.57B
| $2.38M | ﹤0.01% |
311,300
+248,700
| +397% | +$1.85M |
|
1883
CALL
Valvoline
VVV
$4.97B
| $2.37M | ﹤0.01% |
68,200
| – | – |
|
|
JPGE
1884
PUT
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $2.37M | ﹤0.01% |
41,500
+5,000
| +14% | +$286K |
|
1885
PUT
OppFi
OPFI
$770M
| $2.37M | ﹤0.01% |
255,100
+211,800
| +489% | +$2.36M |
|
1886
PUT
Shake Shack
SHAK
$2.3B
| $2.37M | ﹤0.01% |
26,900
-48,000
| -64% | -$5.21M |
|
1887
CALL
Pool Corp
POOL
$6.7B
| $2.35M | ﹤0.01% |
7,400
+6,400
| +640% | +$2.17M |
|
1888
PUT
FS KKR Capital
FSK
$2.98B
| $2.35M | ﹤0.01% |
112,300
+32,700
| +41% | +$731K |
|
1889
CALL
Stride
LRN
$3.69B
| $2.35M | ﹤0.01% |
18,600
-1,100
| -6% | -$139K |
|
1890
CALL
American Eagle Outfitters
AEO
$2.85B
| $2.35M | ﹤0.01% |
202,400
+134,200
| +197% | +$1.92M |
|
|
HIMX
1891
CALL
Himax Technologies
HIMX
$2.2B
| $2.35M | ﹤0.01% |
319,800
+105,600
| +49% | +$977K |
|
1892
CALL
Equity Residential
EQR
$25.4B
| $2.34M | ﹤0.01% |
32,700
+28,900
| +761% | +$2.04M |
|
1893
PUT
Vanguard FTSE Europe ETF
VGK
$30B
| $2.34M | ﹤0.01% |
33,200
+12,200
| +58% | +$841K |
|
1894
PUT
Fluor
FLR
$7.29B
| $2.33M | ﹤0.01% |
65,200
-22,300
| -25% | -$963K |
|
1895
PUT
Range Resources
RRC
$9.11B
| $2.33M | ﹤0.01% |
58,400
-10,900
| -16% | -$419K |
|
|
UNIT
1896
PUT
Uniti Group
UNIT
$2.63B
| $2.33M | ﹤0.01% |
462,000
+800
| +0.2% | +$4.32K |
|
|
WNS
1897
CALL
DELISTED
WNS Holdings
WNS
| $2.32M | ﹤0.01% |
+37,800
| New | +$2.16M |
|
1898
CALL
Mercury Insurance
MCY
$5.94B
| $2.32M | ﹤0.01% |
41,500
+41,300
| +20,650% | +$2.23M |
|
1899
Charter Communications
CHTR
$14.7B
| $2.32M | ﹤0.01% |
6,291
+5,953
| +1,761% | +$2.13M |
|
1900
Becton Dickinson
BDX
$43.1B
| $2.31M | ﹤0.01% |
+10,094
| New | +$2.34M |
|
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.