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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2101
CALL
Viatris
VTRS
$20.1B
| $2.01M | ﹤0.01% |
225,600
+53,700
| +31% | +$454K |
|
2102
ProShares Ultra Silver
AGQ
$1.16B
| $2.01M | ﹤0.01% |
42,395
+40,464
| +2,095% | +$1.71M |
|
2103
CALL
DTE Energy
DTE
$31.1B
| $2.01M | ﹤0.01% |
15,200
+6,200
| +69% | +$834K |
|
2104
PennyMac Financial
PFSI
$4.38B
| $2.01M | ﹤0.01% |
20,198
-5,133
| -20% | -$497K |
|
2105
CALL
Hyatt Hotels
H
$17.6B
| $2.01M | ﹤0.01% |
14,400
+11,500
| +397% | +$1.43M |
|
2106
NIO
NIO
$11.3B
| $2.01M | ﹤0.01% |
586,245
+559,415
| +2,085% | +$2.08M |
|
2107
CALL
Bausch Health
BHC
$1.65B
| $2.01M | ﹤0.01% |
301,700
+191,400
| +174% | +$984K |
|
2108
PUT
Elastic
ESTC
$6.1B
| $2.01M | ﹤0.01% |
23,800
-48,800
| -67% | -$4.13M |
|
2109
PUT
Sun Communities
SUI
$15B
| $2M | ﹤0.01% |
15,800
+15,600
| +7,800% | +$1.93M |
|
2110
FuboTV Inc
FUBO
$245M
| $2M | ﹤0.01% |
43,080
+3,574
| +9% | +$134K |
|
2111
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.99M | ﹤0.01% |
56,500
+17,500
| +45% | +$598K |
|
2112
PUT
AerCap
AER
$23.9B
| $1.99M | ﹤0.01% |
17,000
-3,200
| -16% | -$346K |
|
2113
CALL
Equinix
EQIX
$107B
| $1.99M | ﹤0.01% |
2,500
-500
| -17% | -$424K |
|
|
SGI
2114
CALL
Somnigroup International
SGI
$15.1B
| $1.99M | ﹤0.01% |
29,200
+4,800
| +20% | +$302K |
|
2115
CALL
Compass
COMP
$8.27B
| $1.99M | ﹤0.01% |
316,300
+139,200
| +79% | +$953K |
|
2116
CALL
Replimune Group
REPL
$814M
| $1.99M | ﹤0.01% |
213,800
+210,900
| +7,272% | +$1.84M |
|
2117
CALL
Vestis
VSTS
$2.06B
| $1.98M | ﹤0.01% |
346,400
+305,400
| +745% | +$2.14M |
|
|
AISP
2118
CALL
Airship AI Holdings
AISP
$69.2M
| $1.98M | ﹤0.01% |
336,600
+139,800
| +71% | +$623K |
|
|
GRMN
2119
PUT
Garmin
GRMN
$46.9B
| $1.98M | ﹤0.01% |
9,500
+7,500
| +375% | +$1.49M |
|
2120
PUT
Bitdeer Technologies
BTDR
$2.81B
| $1.98M | ﹤0.01% |
172,400
-149,000
| -46% | -$1.72M |
|
|
USAR
2121
CALL
USA Rare Earth Inc
USAR
$3.46B
| $1.98M | ﹤0.01% |
+180,500
| New | +$1.91M |
|
2122
Remitly
RELY
$4.74B
| $1.98M | ﹤0.01% |
+105,302
| New | +$2.19M |
|
2123
PUT
NCR Voyix
VYX
$1.06B
| $1.98M | ﹤0.01% |
168,500
+32,200
| +24% | +$326K |
|
2124
CALL
AdaptHealth
AHCO
$1.46B
| $1.98M | ﹤0.01% |
209,500
-159,200
| -43% | -$1.4M |
|
2125
Whirlpool
WHR
$2.42B
| $1.97M | ﹤0.01% |
19,471
-35,841
| -65% | -$2.98M |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.