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 | Miscellaneous | 98.56% |
| 2 | Technology | 0.41% |
| 3 | Consumer Discretionary | 0.22% |
| 4 | Healthcare | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1901
DexCom
DXCM
$31.9B
| $2.31M | ﹤0.01% |
33,813
-22,874
| -40% | -$1.87M |
|
1902
Matador Resources
MTDR
$7.4B
| $2.31M | ﹤0.01% |
45,192
+45,100
| +49,022% | +$2.49M |
|
1903
CALL
Dave Inc
DAVE
$4.8B
| $2.31M | ﹤0.01% |
27,900
+24,700
| +772% | +$2.31M |
|
1904
CALL
iShares Convertible Bond ETF
ICVT
$7.98B
| $2.3M | ﹤0.01% |
66,400
+27,600
| +71% | +$2.38M |
|
1905
CALL
Ericsson
ERIC
$32.9B
| $2.3M | ﹤0.01% |
295,900
+111,500
| +60% | +$900K |
|
|
WBS
1906
CALL
DELISTED
Webster Financial
WBS
| $2.29M | ﹤0.01% |
44,500
+29,700
| +201% | +$1.65M |
|
1907
PUT
Vista Energy
VIST
$8.39B
| $2.29M | ﹤0.01% |
49,100
+19,500
| +66% | +$1.01M |
|
1908
CALL
Huntington Ingalls Industries
HII
$11.3B
| $2.29M | ﹤0.01% |
11,200
+8,600
| +331% | +$1.63M |
|
|
NGD
1909
CALL
DELISTED
New Gold Inc
NGD
| $2.29M | ﹤0.01% |
616,000
-2,400
| -0.4% | -$7.11K |
|
1910
PUT
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$5.06B
| $2.28M | ﹤0.01% |
78,100
+57,900
| +287% | +$1.64M |
|
|
BLUE
1911
PUT
DELISTED
bluebird bio
BLUE
| $2.27M | ﹤0.01% |
466,300
+131,700
| +39% | +$792K |
|
1912
CALL
Surgery Partners
SGRY
$1.83B
| $2.27M | ﹤0.01% |
95,700
+68,500
| +252% | +$1.62M |
|
1913
PUT
Beyond Meat
BYND
$193M
| $2.27M | ﹤0.01% |
24,790
-1,170
| -5% | -$129K |
|
1914
PUT
Unum
UNM
$14.9B
| $2.26M | ﹤0.01% |
27,800
+10,300
| +59% | +$794K |
|
1915
C3.ai
AI
$1.68B
| $2.26M | ﹤0.01% |
107,543
+17,632
| +20% | +$500K |
|
|
HUT
1916
PUT
Hut 8
HUT
$12.3B
| $2.26M | ﹤0.01% |
194,500
-79,400
| -29% | -$1.47M |
|
1917
PUT
Plug Power
PLUG
$3.16B
| $2.26M | ﹤0.01% |
1,674,300
-88,600
| -5% | -$168K |
|
1918
ProShares UltraPro S&P 500
UPRO
$5.47B
| $2.26M | ﹤0.01% |
30,560
-31,322
| -51% | -$2.75M |
|
1919
CALL
CenterPoint Energy
CNP
$26.4B
| $2.26M | ﹤0.01% |
62,300
+29,500
| +90% | +$989K |
|
1920
CALL
Douglas Emmett
DEI
$1.88B
| $2.26M | ﹤0.01% |
141,000
+139,700
| +10,746% | +$2.37M |
|
1921
PUT
Peabody Energy
BTU
$3.59B
| $2.25M | ﹤0.01% |
166,400
-228,200
| -58% | -$3.67M |
|
1922
CALL
Genius Sports
GENI
$1.96B
| $2.25M | ﹤0.01% |
225,200
-19,800
| -8% | -$184K |
|
1923
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.92B
| $2.25M | ﹤0.01% |
4,700
+3,200
| +213% | +$1.16M |
|
1924
CALL
Crane Co
CR
$11.7B
| $2.25M | ﹤0.01% |
14,700
-6,400
| -30% | -$1.03M |
|
1925
CALL
Clearwater Paper
CLW
$328M
| $2.25M | ﹤0.01% |
88,700
+49,200
| +125% | +$1.37M |
|
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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.