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 | |
|---|---|---|---|---|---|---|
1976
CALL
Lumentum
LITE
$59.4B
| $2.13M | ﹤0.01% |
34,100
-32,900
| -49% | -$2.53M |
|
|
SA
1977
CALL
Seabridge Gold
SA
$2.8B
| $2.13M | ﹤0.01% |
182,100
+47,100
| +35% | +$559K |
|
1978
PUT
MP Materials
MP
$7.35B
| $2.12M | ﹤0.01% |
86,900
-200
| -0.2% | -$4.65K |
|
1979
American Electric Power
AEP
$73.7B
| $2.12M | ﹤0.01% |
+19,392
| New | +$1.96M |
|
1980
CALL
Gaming and Leisure Properties
GLPI
$12.8B
| $2.12M | ﹤0.01% |
41,600
+27,600
| +197% | +$1.36M |
|
1981
CALL
Equinor
EQNR
$95.9B
| $2.12M | ﹤0.01% |
80,000
-42,700
| -35% | -$1.03M |
|
1982
Gogo Inc
GOGO
$515M
| $2.11M | ﹤0.01% |
245,149
-13,984
| -5% | -$109K |
|
1983
Phillips 66
PSX
$82.9B
| $2.11M | ﹤0.01% |
17,120
+5,721
| +50% | +$705K |
|
1984
CALL
QuidelOrtho
QDEL
$1.09B
| $2.11M | ﹤0.01% |
60,400
+31,500
| +109% | +$1.28M |
|
1985
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.5M
| $2.11M | ﹤0.01% |
47,800
-206,000
| -81% | -$19.1M |
|
1986
CALL
Blackstone Secured Lending
BXSL
$5.41B
| $2.11M | ﹤0.01% |
65,200
+39,900
| +158% | +$1.32M |
|
1987
PUT
XPO
XPO
$25B
| $2.11M | ﹤0.01% |
19,600
-149,600
| -88% | -$19M |
|
|
MAG
1988
CALL
DELISTED
MAG Silver
MAG
| $2.11M | ﹤0.01% |
137,900
-60,800
| -31% | -$944K |
|
|
HBI
1989
CALL
DELISTED
Hanesbrands
HBI
| $2.11M | ﹤0.01% |
365,100
-361,400
| -50% | -$2.53M |
|
|
NVMI
1990
CALL
Nova
NVMI
$13.9B
| $2.1M | ﹤0.01% |
11,400
+1,700
| +18% | +$393K |
|
1991
CALL
Harley-Davidson
HOG
$2.68B
| $2.1M | ﹤0.01% |
83,200
-34,300
| -29% | -$918K |
|
1992
CALL
Aecom
ACM
$9.07B
| $2.1M | ﹤0.01% |
22,600
-3,400
| -13% | -$345K |
|
1993
PUT
Recursion Pharmaceuticals
RXRX
$1.57B
| $2.09M | ﹤0.01% |
394,800
-95,000
| -19% | -$693K |
|
1994
PUT
FTI Consulting
FCN
$4.82B
| $2.08M | ﹤0.01% |
+12,700
| New | +$2.28M |
|
1995
PUT
Kratos Defense & Security Solutions
KTOS
$8.88B
| $2.08M | ﹤0.01% |
69,900
+51,000
| +270% | +$1.55M |
|
1996
PUT
Vital Farms
VITL
$558M
| $2.07M | ﹤0.01% |
67,900
+64,300
| +1,786% | +$2.31M |
|
1997
PUT
Parker-Hannifin
PH
$125B
| $2.07M | ﹤0.01% |
3,400
-900
| -21% | -$589K |
|
|
GTM
1998
CALL
ZoomInfo Technologies
GTM
$861M
| $2.07M | ﹤0.01% |
206,600
-151,800
| -42% | -$1.59M |
|
1999
PUT
Advanced Drainage Systems
WMS
$10.9B
| $2.06M | ﹤0.01% |
19,000
+18,700
| +6,233% | +$2.18M |
|
2000
PUT
AerCap
AER
$23.9B
| $2.06M | ﹤0.01% |
20,200
+4,200
| +26% | +$416K |
|
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.