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 | |
|---|---|---|---|---|---|---|
1801
PUT
Redwire
RDW
$2.08B
| $2.85M | ﹤0.01% |
175,000
+149,000
| +573% | +$1.94M |
|
1802
PUT
Texas Pacific Land
TPL
$28.9B
| $2.85M | ﹤0.01% |
8,100
-8,400
| -51% | -$3.43M |
|
1803
PUT
GE HealthCare
GEHC
$27.6B
| $2.85M | ﹤0.01% |
38,500
-7,000
| -15% | -$487K |
|
1804
Robert Half
RHI
$3.61B
| $2.85M | ﹤0.01% |
+69,468
| New | +$3.16M |
|
1805
PUT
Cencora
COR
$60.3B
| $2.85M | ﹤0.01% |
9,500
-62,000
| -87% | -$17.9M |
|
1806
CALL
Equinor
EQNR
$95.9B
| $2.84M | ﹤0.01% |
113,100
+33,100
| +41% | +$800K |
|
1807
CALL
ResMed
RMD
$28.3B
| $2.84M | ﹤0.01% |
11,000
-1,200
| -10% | -$286K |
|
1808
PUT
Community Health Systems
CYH
$385M
| $2.84M | ﹤0.01% |
834,200
+458,800
| +122% | +$1.48M |
|
1809
PUT
Baxter International
BAX
$11.6B
| $2.83M | ﹤0.01% |
93,600
-28,900
| -24% | -$876K |
|
1810
CALL
Natural Gas Services Group
NGS
$470M
| $2.83M | ﹤0.01% |
109,800
+82,100
| +296% | +$1.84M |
|
1811
CALL
Bath & Body Works
BBWI
$4.01B
| $2.83M | ﹤0.01% |
94,400
-103,900
| -52% | -$3.04M |
|
1812
PUT
Vodafone
VOD
$34.9B
| $2.82M | ﹤0.01% |
264,700
-117,600
| -31% | -$1.14M |
|
1813
PUT
Full Truck Alliance
YMM
$9.56B
| $2.82M | ﹤0.01% |
238,600
-77,400
| -24% | -$901K |
|
1814
PUT
Bitwise Bitcoin ETF
BITB
$2.46B
| $2.81M | ﹤0.01% |
48,000
+28,600
| +147% | +$1.53M |
|
1815
CALL
McEwen Inc
MUX
$1.03B
| $2.81M | ﹤0.01% |
292,600
-101,000
| -26% | -$823K |
|
1816
Ally Financial
ALLY
$13.1B
| $2.81M | ﹤0.01% |
+72,167
| New | +$2.5M |
|
1817
PUT
Enbridge
ENB
$124B
| $2.81M | ﹤0.01% |
61,900
-23,600
| -28% | -$1.07M |
|
1818
CALL
Parker-Hannifin
PH
$125B
| $2.79M | ﹤0.01% |
4,000
-700
| -15% | -$442K |
|
1819
PUT
Lincoln National
LNC
$7.91B
| $2.79M | ﹤0.01% |
80,700
-25,400
| -24% | -$831K |
|
1820
CALL
Elastic
ESTC
$6.1B
| $2.78M | ﹤0.01% |
33,000
+4,500
| +16% | +$380K |
|
1821
PUT
GDS Holdings
GDS
$6.34B
| $2.78M | ﹤0.01% |
90,900
+36,000
| +66% | +$913K |
|
|
NNE
1822
PUT
Nano Nuclear Energy
NNE
$813M
| $2.77M | ﹤0.01% |
80,400
+20,300
| +34% | +$559K |
|
1823
CALL
OppFi
OPFI
$770M
| $2.77M | ﹤0.01% |
198,100
-254,500
| -56% | -$2.86M |
|
1824
CALL
American Eagle Outfitters
AEO
$2.85B
| $2.77M | ﹤0.01% |
288,000
+85,600
| +42% | +$919K |
|
1825
Sempra
SRE
$60.8B
| $2.77M | ﹤0.01% |
36,497
+28,429
| +352% | +$2.11M |
|
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.