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 | |
|---|---|---|---|---|---|---|
1101
PUT
Cleveland-Cliffs
CLF
$6.25B
| $7.09M | ﹤0.01% |
932,500
-824,200
| -47% | -$6.13M |
|
1102
PUT
CoStar Group
CSGP
$11.1B
| $7.08M | ﹤0.01% |
88,100
-6,800
| -7% | -$530K |
|
1103
AstraZeneca
AZN
$261B
| $7.08M | ﹤0.01% |
+50,647
| New | +$7.1M |
|
1104
lululemon athletica
LULU
$12.6B
| $7.08M | ﹤0.01% |
+29,788
| New | +$8.21M |
|
1105
PUT
Prologis
PLD
$135B
| $7.07M | ﹤0.01% |
67,300
-21,000
| -24% | -$2.2M |
|
1106
PUT
Edison International
EIX
$30.6B
| $7.07M | ﹤0.01% |
137,000
-246,100
| -64% | -$13.5M |
|
1107
Invesco S&P 500 Equal Weight ETF
RSP
$95.3B
| $7.07M | ﹤0.01% |
+38,899
| New | +$6.71M |
|
1108
Coca-Cola
KO
$349B
| $7.06M | ﹤0.01% |
+99,795
| New | +$7.11M |
|
1109
PUT
YPF
YPF
$20.4B
| $7.05M | ﹤0.01% |
224,300
-121,300
| -35% | -$4.05M |
|
1110
PUT
NetApp
NTAP
$32.3B
| $7.04M | ﹤0.01% |
66,100
+3,800
| +6% | +$360K |
|
1111
CALL
Ares Management
ARES
$27.4B
| $7.03M | ﹤0.01% |
40,600
+14,000
| +53% | +$2.21M |
|
|
PRMB
1112
CALL
Primo Brands
PRMB
$8.27B
| $7.03M | ﹤0.01% |
237,300
+119,300
| +101% | +$3.81M |
|
1113
CALL
Franco-Nevada
FNV
$41.3B
| $7.01M | ﹤0.01% |
42,800
+5,800
| +16% | +$960K |
|
1114
PUT
Tapestry
TPR
$28.1B
| $7.01M | ﹤0.01% |
79,800
-119,400
| -60% | -$9.04M |
|
1115
CALL
Vanguard FTSE Europe ETF
VGK
$29.8B
| $7M | ﹤0.01% |
94,300
-17,400
| -16% | -$1.28M |
|
1116
Charter Communications
CHTR
$15.6B
| $7M | ﹤0.01% |
17,111
+10,820
| +172% | +$4.14M |
|
|
TLN
1117
PUT
Talen Energy Corp
TLN
$18.1B
| $6.98M | ﹤0.01% |
24,000
-15,100
| -39% | -$3.58M |
|
1118
CALL
Invesco Aerospace & Defense ETF
PPA
$8.22B
| $6.97M | ﹤0.01% |
45,000
-436,400
| -91% | -$55.3M |
|
1119
PUT
KE Holdings
BEKE
$17.8B
| $6.97M | ﹤0.01% |
392,900
-580,100
| -60% | -$11.2M |
|
|
FLG
1120
PUT
Flagstar Bank National Association
FLG
$6.13B
| $6.96M | ﹤0.01% |
657,000
-171,200
| -21% | -$1.96M |
|
1121
PUT
Peabody Energy
BTU
$2.9B
| $6.95M | ﹤0.01% |
518,200
+351,800
| +211% | +$4.64M |
|
1122
PUT
SolarEdge
SEDG
$2.75B
| $6.94M | ﹤0.01% |
340,000
-56,000
| -14% | -$926K |
|
1123
CALL
Simon Property Group
SPG
$73B
| $6.93M | ﹤0.01% |
43,100
-15,300
| -26% | -$2.42M |
|
1124
CALL
HDFC Bank
HDB
$119B
| $6.92M | ﹤0.01% |
180,600
+142,800
| +378% | +$5.18M |
|
1125
PUT
Grayscale Bitcoin Trust
GBTC
$9.74B
| $6.92M | ﹤0.01% |
81,600
+47,700
| +141% | +$3.71M |
|
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.