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 | |
|---|---|---|---|---|---|---|
1326
CALL
Lumen
LUMN
$6.58B
| $5.12M | ﹤0.01% |
1,168,600
-181,700
| -13% | -$704K |
|
|
GMS
1327
PUT
DELISTED
GMS Inc
GMS
| $5.11M | ﹤0.01% |
+47,000
| New | +$3.64M |
|
1328
PUT
Klaviyo
KVYO
$4.97B
| $5.11M | ﹤0.01% |
152,100
-39,700
| -21% | -$1.26M |
|
|
GAP
1329
CALL
The Gap Inc
GAP
$6.87B
| $5.08M | ﹤0.01% |
232,800
-100,600
| -30% | -$2.25M |
|
1330
CALL
GDS Holdings
GDS
$6.33B
| $5.06M | ﹤0.01% |
165,400
-21,600
| -12% | -$548K |
|
1331
MongoDB
MDB
$24B
| $5.05M | ﹤0.01% |
+24,049
| New | +$4.45M |
|
1332
CALL
Peabody Energy
BTU
$2.78B
| $5.05M | ﹤0.01% |
376,300
-131,400
| -26% | -$1.73M |
|
1333
PUT
Dynatrace
DT
$12.1B
| $5.04M | ﹤0.01% |
91,200
+33,600
| +58% | +$1.68M |
|
1334
CALL
Toyota
TM
$210B
| $5.03M | ﹤0.01% |
29,200
-34,300
| -54% | -$6.2M |
|
1335
iShares MSCI China ETF
MCHI
$6.04B
| $5.02M | ﹤0.01% |
+91,103
| New | +$4.84M |
|
1336
PUT
Summit Therapeutics
SMMT
$10.6B
| $5.01M | ﹤0.01% |
235,700
+73,600
| +45% | +$1.68M |
|
1337
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.83B
| $5.01M | ﹤0.01% |
7,900
+3,200
| +68% | +$1.09M |
|
1338
CALL
Monster Beverage
MNST
$91.1B
| $5M | ﹤0.01% |
79,900
+10,400
| +15% | +$635K |
|
|
EMBJ
1339
CALL
Embraer S.A. ADS
EMBJ
$11.6B
| $5M | ﹤0.01% |
87,900
+28,900
| +49% | +$1.36M |
|
1340
CALL
Uranium Energy
UEC
$4.71B
| $5M | ﹤0.01% |
735,400
+96,900
| +15% | +$543K |
|
1341
PUT
QuantumScape Corp
QS
$3.06B
| $5M | ﹤0.01% |
743,600
+95,100
| +15% | +$402K |
|
1342
CALL
Regions Financial
RF
$26.3B
| $4.99M | ﹤0.01% |
212,300
+20,300
| +11% | +$430K |
|
1343
CALL
Builders FirstSource
BLDR
$7.81B
| $4.98M | ﹤0.01% |
42,700
+21,300
| +100% | +$2.46M |
|
1344
Eos Energy Enterprises
EOSE
$1.25B
| $4.98M | ﹤0.01% |
972,664
+61,948
| +7% | +$304K |
|
1345
CALL
Advance Auto Parts
AAP
$3.29B
| $4.97M | ﹤0.01% |
107,000
+24,800
| +30% | +$994K |
|
1346
CALL
2x Long VIX Futures ETF
UVIX
$290M
| $4.96M | ﹤0.01% |
13,340
-3,405
| -20% | -$2.61M |
|
1347
CALL
Exelixis
EXEL
$13.9B
| $4.96M | ﹤0.01% |
112,600
-10,000
| -8% | -$400K |
|
1348
PUT
Macy's
M
$6.14B
| $4.96M | ﹤0.01% |
425,600
-26,200
| -6% | -$304K |
|
1349
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $4.96M | ﹤0.01% |
59,800
+17,100
| +40% | +$1M |
|
1350
C3.ai
AI
$1.28B
| $4.96M | ﹤0.01% |
201,899
+94,356
| +88% | +$2.16M |
|
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.