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 | |
|---|---|---|---|---|---|---|
251
PUT
Vistra
VST
$56.4B
| $60.6M | 0.03% |
312,600
-180,200
| -37% | -$26.7M |
|
252
PUT
DraftKings
DKNG
$11.4B
| $59.8M | 0.03% |
1,395,300
+149,800
| +12% | +$5.37M |
|
253
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $59.8M | 0.03% |
493,500
-177,400
| -26% | -$5.18M |
|
254
PUT
JD.com
JD
$40.8B
| $59.7M | 0.03% |
1,827,700
+30,500
| +2% | +$1.04M |
|
255
CALL
Freeport-McMoran
FCX
$92.6B
| $59.4M | 0.03% |
1,454,800
-1,545,500
| -52% | -$58.7M |
|
256
CALL
T-Mobile US
TMUS
$208B
| $59.4M | 0.03% |
249,300
+30,100
| +14% | +$7.35M |
|
257
CALL
United States Oil Fund
USO
$2.37B
| $59.1M | 0.03% |
807,800
+522,900
| +184% | +$36.5M |
|
258
Meta Platforms (Facebook)
META
$1.59T
| $58.7M | 0.03% |
+79,568
| New | +$49.2M |
|
259
CALL
Airbnb
ABNB
$83.8B
| $58.2M | 0.03% |
439,700
-47,300
| -10% | -$5.99M |
|
260
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $58.1M | 0.03% |
2,111,400
+121,400
| +6% | +$3.14M |
|
|
SCHW
261
CALL
Charles Schwab
SCHW
$174B
| $58M | 0.03% |
635,600
+113,300
| +22% | +$9.49M |
|
|
262
CALL
DraftKings
DKNG
$11.4B
| $58M | 0.03% |
1,351,300
-508,400
| -27% | -$18.2M |
|
263
CALL
AST SpaceMobile
ASTS
$18.8B
| $57.9M | 0.03% |
1,238,300
+265,900
| +27% | +$7.7M |
|
264
CALL
Core Scientific
CORZ
$7.58B
| $57.5M | 0.03% |
3,370,300
-684,200
| -17% | -$6.85M |
|
265
CALL
Home Depot
HD
$331B
| $57.2M | 0.03% |
155,900
-142,700
| -48% | -$51.6M |
|
266
PUT
Cloudflare
NET
$96.3B
| $56.4M | 0.03% |
287,900
+43,800
| +18% | +$6.36M |
|
|
267
UnitedHealth
UNH
$394B
| $56.2M | 0.03% |
180,167
+144,106
| +400% | +$55.1M |
|
268
PUT
Philip Morris
PM
$302B
| $56.2M | 0.03% |
308,400
-41,200
| -12% | -$7.08M |
|
269
PUT
Royal Caribbean
RCL
$76.8B
| $55.4M | 0.03% |
176,800
-75,800
| -30% | -$18M |
|
|
270
PUT
Airbnb
ABNB
$83.8B
| $54.8M | 0.03% |
414,000
-42,700
| -9% | -$5.41M |
|
271
CALL
Dollar Tree
DLTR
$23.6B
| $54.8M | 0.03% |
553,200
-126,600
| -19% | -$10.9M |
|
272
Intel
INTC
$527B
| $54.7M | 0.03% |
2,441,452
-938,844
| -28% | -$19.5M |
|
273
CALL
Energy Transfer Partners
ET
$70.1B
| $54.4M | 0.03% |
3,002,700
-800,600
| -21% | -$14M |
|
274
PUT
Trade Desk
TTD
$8.31B
| $54.1M | 0.03% |
751,300
+96,000
| +15% | +$6.13M |
|
275
CALL
Rocket Lab Corp
RKLB
$44.6B
| $53.6M | 0.03% |
1,498,800
+67,500
| +5% | +$1.65M |
|
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.