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 | |
|---|---|---|---|---|---|---|
201
PUT
Merck
MRK
$315B
| $78.4M | 0.04% |
990,000
+24,500
| +3% | +$1.95M |
|
|
XYZ
202
PUT
Block Inc
XYZ
$46.1B
| $78.2M | 0.04% |
1,150,800
+528,800
| +85% | +$30.8M |
|
203
CALL
JD.com
JD
$40.8B
| $77.3M | 0.04% |
2,367,900
-512,800
| -18% | -$17.5M |
|
204
PUT
Arista Networks
ANET
$221B
| $76.9M | 0.04% |
839,100
+160,300
| +24% | +$13.9M |
|
|
UWC
205
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $76.7M | 0.04% |
921,500
-103,600
| -10% | -$8.62M |
|
206
Micron Technology
MU
$1.09T
| $75.9M | 0.04% |
616,179
-37,759
| -6% | -$3.53M |
|
207
PUT
Avis
CAR
$5.82B
| $75.4M | 0.04% |
446,200
+271,200
| +155% | +$29.2M |
|
208
CALL
ServiceNow
NOW
$98.9B
| $74.9M | 0.04% |
364,500
-13,500
| -4% | -$2.55M |
|
|
209
PUT
ServiceNow
NOW
$98.9B
| $74.3M | 0.04% |
361,500
-245,500
| -40% | -$46.3M |
|
210
PUT
First Solar
FSLR
$22.5B
| $74.3M | 0.04% |
448,900
+59,400
| +15% | +$8.77M |
|
211
PUT
AT&T
T
$158B
| $74.1M | 0.04% |
2,561,500
-131,800
| -5% | -$3.63M |
|
|
KFYP
212
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $73.8M | 0.04% |
2,151,300
-1,552,600
| -42% | -$53.3M |
|
213
PUT
Starbucks
SBUX
$117B
| $73.7M | 0.04% |
804,100
-223,400
| -22% | -$19.4M |
|
214
CALL
Philip Morris
PM
$301B
| $73.1M | 0.04% |
401,300
-15,800
| -4% | -$2.71M |
|
215
CALL
Johnson & Johnson
JNJ
$612B
| $72.6M | 0.04% |
475,500
-408,300
| -46% | -$62.8M |
|
216
PUT
CVS Health
CVS
$139B
| $72.3M | 0.04% |
1,047,900
-440,600
| -30% | -$28.9M |
|
217
CALL
United Parcel Service
UPS
$98.8B
| $72.2M | 0.04% |
715,600
+242,100
| +51% | +$23.8M |
|
218
CALL
Target
TGT
$62.7B
| $72.1M | 0.04% |
730,700
-23,500
| -3% | -$2.26M |
|
219
CALL
Mastercard
MA
$470B
| $70.9M | 0.04% |
126,100
+8,800
| +8% | +$4.87M |
|
220
PUT
American Airlines Group
AAL
$9.84B
| $70.3M | 0.04% |
6,262,500
+1,133,100
| +22% | +$12.1M |
|
221
CALL
Cameco
CCJ
$39.5B
| $70.1M | 0.04% |
944,300
+555,300
| +143% | +$29.6M |
|
222
PUT
Bristol-Myers Squibb
BMY
$124B
| $69.8M | 0.04% |
1,508,400
+406,600
| +37% | +$20M |
|
223
CALL
Intuit
INTU
$78.1B
| $69.6M | 0.04% |
88,400
+1,200
| +1% | +$812K |
|
224
CALL
Sea Limited
SE
$64.5B
| $69.5M | 0.04% |
434,800
-33,100
| -7% | -$4.79M |
|
225
CALL
AbbVie
ABBV
$447B
| $69.4M | 0.04% |
374,000
-193,900
| -34% | -$36M |
|
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.