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 | |
|---|---|---|---|---|---|---|
7101
CALL
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$545M
| $13K | ﹤0.01% |
200
-66,200
| -100% | -$3.74M |
|
7102
FirstService
FSV
$6.45B
| $13K | ﹤0.01% |
75
+72
| +2,400% | +$12.5K |
|
7103
CALL
Invesco CurrencyShares Australian Dollar Trust
FXA
$97M
| $13K | ﹤0.01% |
+200
| New | +$12.7K |
|
7104
CALL
Huron Consulting
HURN
$1.89B
| $13K | ﹤0.01% |
+100
| New | +$14.2K |
|
7105
Independent Bank
INDB
$4.03B
| $13K | ﹤0.01% |
+214
| New | +$13K |
|
7106
iShares S&P India Nifty 50 Index Fund
INDY
$554M
| $13K | ﹤0.01% |
242
+140
| +137% | +$7.36K |
|
7107
PUT
Ingredion
INGR
$6.4B
| $13K | ﹤0.01% |
100
-300
| -75% | -$40.5K |
|
7108
CALL
Inseego
INSG
$114M
| $13K | ﹤0.01% |
30,400
+6,900
| +29% | +$53.9K |
|
7109
CALL
Itron
ITRI
$3.76B
| $13K | ﹤0.01% |
100
-400
| -80% | -$45.3K |
|
7110
Kaiser Aluminum
KALU
$2.65B
| $13K | ﹤0.01% |
171
-42
| -20% | -$2.86K |
|
7111
CALL
Kodiak Sciences
KOD
$2.62B
| $13K | ﹤0.01% |
3,500
-3,300
| -49% | -$11.7K |
|
|
KW
7112
CALL
DELISTED
Kennedy-Wilson Holdings
KW
| $13K | ﹤0.01% |
2,000
-7,000
| -78% | -$46.7K |
|
7113
PUT
Lifecore Biomedical
LFCR
$163M
| $13K | ﹤0.01% |
1,700
+1,400
| +467% | +$9.44K |
|
7114
CALL
Lightwave Logic
LWLG
$945M
| $13K | ﹤0.01% |
11,200
-7,000
| -38% | -$7.35K |
|
7115
CALL
Magnolia Oil & Gas
MGY
$5.53B
| $13K | ﹤0.01% |
600
-3,500
| -85% | -$77.5K |
|
7116
PUT
Milestone Pharmaceuticals
MIST
$141M
| $13K | ﹤0.01% |
7,000
-3,000
| -30% | -$4K |
|
7117
OGE Energy
OGE
$10.2B
| $13K | ﹤0.01% |
+299
| New | +$13.3K |
|
|
OGI
7118
Organigram Holdings
OGI
$132M
| $13K | ﹤0.01% |
10,243
+5,939
| +138% | +$7.23K |
|
7119
CALL
Pampa Energía
PAM
$4.61B
| $13K | ﹤0.01% |
200
+100
| +100% | +$7.5K |
|
|
PLL
7120
CALL
DELISTED
Piedmont Lithium
PLL
| $13K | ﹤0.01% |
2,400
-600
| -20% | -$3.92K |
|
|
PROF
7121
Profound Medical
PROF
$266M
| $13K | ﹤0.01% |
2,263
+1,221
| +117% | +$6.46K |
|
7122
CALL
Privia Health
PRVA
$3.11B
| $13K | ﹤0.01% |
600
-2,300
| -79% | -$53.3K |
|
|
RPC
7123
Ridgepost Capital
RPC
$957M
| $13K | ﹤0.01% |
+1,300
| New | +$13.9K |
|
7124
Pyxis Oncology
PYXS
$184M
| $13K | ﹤0.01% |
12,615
+3,810
| +43% | +$4.29K |
|
7125
PUT
Quanterix
QTRX
$173M
| $13K | ﹤0.01% |
+2,100
| New | +$11.7K |
|
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.