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 | |
|---|---|---|---|---|---|---|
1226
PUT
Toyota
TM
$210B
| $5.87M | ﹤0.01% |
34,100
+4,800
| +16% | +$868K |
|
1227
CALL
Keurig Dr Pepper
KDP
$40.5B
| $5.87M | ﹤0.01% |
177,500
-42,400
| -19% | -$1.43M |
|
1228
Warner Bros
WBD
$65.6B
| $5.87M | ﹤0.01% |
511,945
-574,859
| -53% | -$5.36M |
|
|
SMLR
1229
CALL
DELISTED
Semler Scientific
SMLR
| $5.85M | ﹤0.01% |
151,000
+137,000
| +979% | +$4.88M |
|
1230
CALL
Global X MSCI Norway ETF
NORW
$86.1M
| $5.83M | ﹤0.01% |
70,300
+61,600
| +708% | +$1.71M |
|
1231
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$149B
| $5.83M | ﹤0.01% |
108,100
+48,500
| +81% | +$2.71M |
|
1232
PUT
Alaska Air
ALK
$5.09B
| $5.83M | ﹤0.01% |
117,800
-31,100
| -21% | -$1.51M |
|
1233
CALL
Best Buy
BBY
$17.9B
| $5.81M | ﹤0.01% |
86,600
-26,100
| -23% | -$1.77M |
|
|
ETHA
1234
PUT
iShares Ethereum Trust ETF
ETHA
$5.21B
| $5.8M | ﹤0.01% |
+304,300
| New | +$5.06M |
|
1235
Advance Auto Parts
AAP
$3.23B
| $5.8M | ﹤0.01% |
124,762
+25,611
| +26% | +$1.03M |
|
1236
CALL
Yum China
YUMC
$14.8B
| $5.8M | ﹤0.01% |
129,700
-53,400
| -29% | -$2.39M |
|
1237
CALL
Canadian Pacific Kansas City
CP
$81.8B
| $5.79M | ﹤0.01% |
73,100
+32,200
| +79% | +$2.48M |
|
1238
CALL
Generac Holdings
GNRC
$12.3B
| $5.79M | ﹤0.01% |
40,400
+10,900
| +37% | +$1.33M |
|
1239
CALL
Corcept Therapeutics
CORT
$10.3B
| $5.78M | ﹤0.01% |
78,800
-4,300
| -5% | -$312K |
|
1240
CALL
PNC Financial Services
PNC
$99.9B
| $5.78M | ﹤0.01% |
31,000
-600
| -2% | -$102K |
|
1241
CALL
Equitable Holdings
EQH
$12.9B
| $5.78M | ﹤0.01% |
103,000
+95,800
| +1,331% | +$4.93M |
|
1242
PUT
ProShares Ultra S&P500
SSO
$7.8B
| $5.78M | ﹤0.01% |
114,800
-62,800
| -35% | -$2.65M |
|
|
AEVA
1243
PUT
Aeva Technologies
AEVA
$1.04B
| $5.77M | ﹤0.01% |
152,700
+147,000
| +2,579% | +$2.23M |
|
1244
CALL
BHP
BHP
$210B
| $5.74M | ﹤0.01% |
119,400
-132,300
| -53% | -$6.36M |
|
1245
CALL
AGNC Investment
AGNC
$12.4B
| $5.74M | ﹤0.01% |
624,400
-819,100
| -57% | -$7.33M |
|
1246
CALL
Arthur J. Gallagher & Co
AJG
$62.4B
| $5.73M | ﹤0.01% |
17,900
-7,000
| -28% | -$2.31M |
|
1247
PUT
Aptiv
APTV
$12B
| $5.73M | ﹤0.01% |
84,000
+5,400
| +7% | +$334K |
|
1248
PUT
Honda
HMC
$36.6B
| $5.72M | ﹤0.01% |
198,400
+2,200
| +1% | +$64.2K |
|
|
ETHE
1249
CALL
Grayscale Ethereum Staking ETF Shares
ETHE
$1.5B
| $5.72M | ﹤0.01% |
+274,200
| New | +$5M |
|
1250
PUT
Allegro MicroSystems
ALGM
$8.83B
| $5.71M | ﹤0.01% |
167,100
+151,400
| +964% | +$3.77M |
|
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.