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 | |
|---|---|---|---|---|---|---|
51
PUT
JPMorgan Chase
JPM
$901B
| $338M | 0.19% |
1,166,300
+53,100
| +5% | +$13.6M |
|
52
PUT
Boeing
BA
$161B
| $337M | 0.19% |
1,609,500
+269,700
| +20% | +$50.9M |
|
53
CALL
Micron Technology
MU
$1.1T
| $335M | 0.19% |
2,716,200
-1,795,300
| -40% | -$168M |
|
54
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $328M | 0.19% |
4,774,700
-729,100
| -13% | -$151M |
|
55
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $318M | 0.18% |
722,300
-1,237,300
| -63% | -$513M |
|
56
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $313M | 0.18% |
644,800
+191,300
| +42% | +$97.2M |
|
|
57
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $311M | 0.18% |
5,213,800
-660,000
| -11% | -$137M |
|
58
CALL
Eli Lilly
LLY
$1.02T
| $308M | 0.18% |
395,100
+172,500
| +77% | +$134M |
|
59
CALL
Super Micro Computer
SMCI
$16.5B
| $303M | 0.17% |
6,189,700
+1,111,500
| +22% | +$42.8M |
|
|
60
PUT
UnitedHealth
UNH
$396B
| $296M | 0.17% |
947,500
+672,600
| +245% | +$257M |
|
|
61
CALL
JPMorgan Chase
JPM
$901B
| $290M | 0.17% |
1,001,800
-126,100
| -11% | -$32.2M |
|
|
62
CALL
Boeing
BA
$161B
| $282M | 0.16% |
1,344,600
-133,200
| -9% | -$25.2M |
|
63
CALL
Oracle
ORCL
$366B
| $273M | 0.16% |
1,250,000
-51,200
| -4% | -$8.27M |
|
64
PUT
Nike
NKE
$63.7B
| $273M | 0.16% |
3,836,000
+1,858,100
| +94% | +$112M |
|
65
CALL
Citigroup
C
$216B
| $269M | 0.15% |
3,281,900
-43,500
| -1% | -$3.14M |
|
66
PUT
Alibaba
BABA
$283B
| $265M | 0.15% |
2,337,000
-661,100
| -22% | -$78.3M |
|
67
CALL
Booking.com
BKNG
$139B
| $265M | 0.15% |
1,142,500
-787,500
| -41% | -$161M |
|
|
68
PUT
Citigroup
C
$216B
| $263M | 0.15% |
3,088,200
-78,300
| -2% | -$5.66M |
|
|
69
PUT
Oracle
ORCL
$366B
| $262M | 0.15% |
1,197,600
+230,400
| +24% | +$37.2M |
|
70
PUT
Vanguard S&P 500 ETF
VOO
$981B
| $248M | 0.14% |
529,000
+180,000
| +52% | +$94.6M |
|
71
PUT
Robinhood
HOOD
$95.5B
| $243M | 0.14% |
2,591,300
-353,900
| -12% | -$20.9M |
|
|
72
PUT
Eli Lilly
LLY
$1.02T
| $239M | 0.14% |
306,600
+38,400
| +14% | +$29.8M |
|
73
CALL
Goldman Sachs
GS
$320B
| $238M | 0.14% |
335,700
+30,300
| +10% | +$17.6M |
|
74
PUT
Bank of America
BAC
$430B
| $237M | 0.14% |
5,150,100
+2,059,000
| +67% | +$86.6M |
|
75
PUT
Carvana
CVNA
$47B
| $236M | 0.14% |
3,501,000
-131,000
| -4% | -$7.18M |
|
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.