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 | |
|---|---|---|---|---|---|---|
176
PUT
GE Vernova
GEV
$271B
| $88.1M | 0.05% |
166,500
-29,700
| -15% | -$12.4M |
|
177
PUT
Chipotle Mexican Grill
CMG
$42.1B
| $87.9M | 0.05% |
1,565,100
+293,700
| +23% | +$14.9M |
|
178
PUT
Shopify
SHOP
$155B
| $87.6M | 0.05% |
759,300
+22,900
| +3% | +$2.29M |
|
179
PUT
Johnson & Johnson
JNJ
$613B
| $87.5M | 0.05% |
572,700
+45,400
| +9% | +$6.98M |
|
180
PUT
Dell
DELL
$288B
| $87.3M | 0.05% |
712,100
-191,400
| -21% | -$19.6M |
|
181
CALL
Proshares UltraShort Technology
REW
$3.31M
| $87.2M | 0.05% |
1,056,675
+81,600
| +8% | +$3.3M |
|
|
182
CALL
GE Vernova
GEV
$271B
| $86.6M | 0.05% |
163,600
-48,700
| -23% | -$20.3M |
|
183
CALL
NextEra Energy
NEE
$186B
| $84.9M | 0.05% |
1,399,600
+108,300
| +8% | +$7.52M |
|
184
CALL
iShares Morningstar Value ETF
ILCV
$1.3B
| $84.3M | 0.05% |
1,129,100
-1,090,800
| -49% | -$86.9M |
|
185
CALL
Merck
MRK
$317B
| $84.3M | 0.05% |
1,064,800
+33,100
| +3% | +$2.63M |
|
|
NVO
186
PUT
Novo Nordisk
NVO
$216B
| $84M | 0.05% |
1,216,900
+260,500
| +27% | +$17.7M |
|
187
PUT
AST SpaceMobile
ASTS
$18.8B
| $82.6M | 0.05% |
1,767,300
+194,400
| +12% | +$5.63M |
|
188
PUT
lululemon athletica
LULU
$12.8B
| $82.1M | 0.05% |
345,700
+120,800
| +54% | +$33.3M |
|
189
CALL
Carnival Corporation Ltd
CCL
$35.6B
| $81.7M | 0.05% |
2,905,600
+274,300
| +10% | +$5.87M |
|
190
CALL
McDonald's
MCD
$187B
| $81.6M | 0.05% |
279,400
+8,000
| +3% | +$2.47M |
|
191
PUT
Newmont
NEM
$102B
| $81.4M | 0.05% |
1,397,300
+209,600
| +18% | +$11.2M |
|
192
PUT
Roblox
RBLX
$36.2B
| $81.2M | 0.05% |
771,600
+40,200
| +5% | +$3.16M |
|
193
CALL
Hims & Hers Health
HIMS
$7.46B
| $80.7M | 0.05% |
1,619,200
+173,600
| +12% | +$7.85M |
|
194
CALL
Adobe
ADBE
$88.2B
| $80.5M | 0.05% |
208,100
-49,300
| -19% | -$19M |
|
|
CRWV
195
CALL
CoreWeave
CRWV
$45.5B
| $79.1M | 0.05% |
+485,000
| New | +$44.7M |
|
196
PUT
Snowflake
SNOW
$92.1B
| $78.9M | 0.05% |
352,500
-94,400
| -21% | -$17.1M |
|
197
CALL
Applied Materials
AMAT
$444B
| $78.8M | 0.05% |
430,300
-27,100
| -6% | -$4.29M |
|
198
PUT
Coca-Cola
KO
$355B
| $78.6M | 0.05% |
1,110,600
-77,000
| -6% | -$5.48M |
|
199
Booking.com
BKNG
$138B
| $78.5M | 0.05% |
339,075
+268,400
| +380% | +$55M |
|
|
200
CALL
Chipotle Mexican Grill
CMG
$42.1B
| $78.4M | 0.04% |
1,396,800
+469,600
| +51% | +$23.9M |
|
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.