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 | |
|---|---|---|---|---|---|---|
26
CALL
Strategy Inc
MSTR
$37B
| $1.02B | 0.58% |
2,513,500
-618,400
| -20% | -$225M |
|
|
27
PUT
Amazon
AMZN
$2.66T
| $1B | 0.57% |
4,569,100
-741,100
| -14% | -$147M |
|
|
28
PUT
Broadcom
AVGO
$1.84T
| $936M | 0.54% |
3,396,400
+17,100
| +0.5% | +$3.71M |
|
29
CALL
Advanced Micro Devices
AMD
$888B
| $933M | 0.53% |
6,573,100
+169,700
| +3% | +$18.5M |
|
30
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $897M | 0.51% |
5,079,600
+472,000
| +10% | +$77.3M |
|
31
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $794M | 0.45% |
22,456,200
-366,400
| -2% | -$15.5M |
|
32
CALL
iShares Bitcoin Trust
IBIT
$48.9B
| $755M | 0.43% |
12,341,200
+2,882,800
| +30% | +$162M |
|
33
CALL
Palantir
PLTR
$318B
| $702M | 0.4% |
5,149,200
-780,600
| -13% | -$91.6M |
|
|
34
PUT
Advanced Micro Devices
AMD
$888B
| $692M | 0.4% |
4,875,800
+165,600
| +4% | +$18M |
|
|
35
PUT
TSMC
TSM
$2.2T
| $675M | 0.39% |
2,982,400
+170,700
| +6% | +$31.6M |
|
36
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $656M | 0.38% |
4,804,400
-921,900
| -16% | -$45.8M |
|
37
PUT
iShares Morningstar Value ETF
ILCV
$1.3B
| $644M | 0.37% |
7,799,800
+1,610,500
| +26% | +$128M |
|
|
38
PUT
Palantir
PLTR
$318B
| $614M | 0.35% |
5,422,700
+44,700
| +0.8% | +$5.24M |
|
|
39
CALL
Broadcom
AVGO
$1.84T
| $600M | 0.34% |
2,233,500
-461,600
| -17% | -$100M |
|
|
40
CALL
VanEck Gold Miners ETF
GDX
$22.7B
| $599M | 0.34% |
4,990,800
-122,500
| -2% | -$6.08M |
|
41
CALL
Alibaba
BABA
$283B
| $549M | 0.31% |
4,840,300
-1,321,400
| -21% | -$156M |
|
42
CALL
iShares Silver Trust
SLV
$28.4B
| $511M | 0.29% |
15,572,300
-206,700
| -1% | -$6.32M |
|
43
CALL
Coinbase
COIN
$46.3B
| $497M | 0.28% |
1,418,200
+410,100
| +41% | +$95.9M |
|
44
PUT
Booking.com
BKNG
$139B
| $487M | 0.28% |
2,102,500
-2,252,500
| -52% | -$461M |
|
|
45
PUT
iShares Bitcoin Trust
IBIT
$48.9B
| $465M | 0.27% |
7,602,900
+3,748,500
| +97% | +$210M |
|
|
46
PUT
Coinbase
COIN
$46.3B
| $442M | 0.25% |
1,260,000
+453,900
| +56% | +$106M |
|
|
47
NVIDIA
NVDA
$5.02T
| $392M | 0.22% |
2,481,314
+1,367,934
| +123% | +$172M |
|
48
CALL
Robinhood
HOOD
$95.5B
| $389M | 0.22% |
4,157,200
-501,000
| -11% | -$29.7M |
|
49
PUT
Micron Technology
MU
$1.1T
| $352M | 0.2% |
2,853,300
+293,400
| +11% | +$27.4M |
|
|
50
CALL
TSMC
TSM
$2.2T
| $349M | 0.2% |
1,543,000
-301,600
| -16% | -$55.9M |
|
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.