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 | |
|---|---|---|---|---|---|---|
2051
Archer Aviation
ACHR
$3.64B
| $2.11M | ﹤0.01% |
194,914
-357,327
| -65% | -$3.34M |
|
2052
CALL
PennyMac Financial
PFSI
$4.38B
| $2.11M | ﹤0.01% |
21,200
-22,900
| -52% | -$2.22M |
|
2053
PUT
Protagonist Therapeutics
PTGX
$8.75B
| $2.11M | ﹤0.01% |
38,200
-4,400
| -10% | -$211K |
|
2054
PUT
JB Hunt Transport Services
JBHT
$27.1B
| $2.11M | ﹤0.01% |
14,700
+11,800
| +407% | +$1.63M |
|
2055
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $2.1M | ﹤0.01% |
32,893
+24,804
| +307% | +$1.58M |
|
2056
TMC The Metals Company
TMC
$1.59B
| $2.1M | ﹤0.01% |
318,392
+182,038
| +134% | +$698K |
|
2057
CALL
Goodyear
GT
$2.07B
| $2.1M | ﹤0.01% |
202,600
+3,900
| +2% | +$41.3K |
|
2058
Alexandria Real Estate Equities
ARE
$8.88B
| $2.1M | ﹤0.01% |
28,881
+26,500
| +1,113% | +$1.97M |
|
2059
CALL
Baxter International
BAX
$11.6B
| $2.1M | ﹤0.01% |
69,200
-13,300
| -16% | -$403K |
|
2060
CALL
Hudbay
HBM
$9.92B
| $2.09M | ﹤0.01% |
197,400
+76,500
| +63% | +$637K |
|
2061
CALL
Dropbox
DBX
$6.81B
| $2.09M | ﹤0.01% |
73,200
-44,200
| -38% | -$1.25M |
|
2062
PUT
Polaris
PII
$4.15B
| $2.09M | ﹤0.01% |
51,500
-9,800
| -16% | -$369K |
|
2063
CALL
nVent Electric
NVT
$24.5B
| $2.09M | ﹤0.01% |
28,500
-8,200
| -22% | -$504K |
|
2064
Burlington
BURL
$22B
| $2.08M | ﹤0.01% |
8,959
-3,479
| -28% | -$827K |
|
|
WRD
2065
WeRide Inc
WRD
$1.75B
| $2.08M | ﹤0.01% |
+264,481
| New | +$2.36M |
|
2066
Rubrik
RBRK
$15.1B
| $2.08M | ﹤0.01% |
23,235
-6,896
| -23% | -$545K |
|
|
WRD
2067
PUT
WeRide Inc
WRD
$1.75B
| $2.08M | ﹤0.01% |
+264,100
| New | +$2.36M |
|
2068
Nutrien
NTR
$32.7B
| $2.08M | ﹤0.01% |
35,689
+34,062
| +2,094% | +$1.92M |
|
2069
CALL
Concentrix
CNXC
$1.36B
| $2.08M | ﹤0.01% |
39,300
+20,200
| +106% | +$1.07M |
|
2070
PUT
New York Times
NYT
$11.6B
| $2.08M | ﹤0.01% |
37,100
+36,300
| +4,538% | +$1.92M |
|
|
CEP
2071
CALL
DELISTED
Cantor Equity Partners
CEP
| $2.08M | ﹤0.01% |
+74,700
| New | +$2.28M |
|
2072
PUT
United Therapeutics
UTHR
$26.3B
| $2.07M | ﹤0.01% |
7,200
+5,600
| +350% | +$1.67M |
|
2073
Gogo Inc
GOGO
$515M
| $2.06M | ﹤0.01% |
140,722
-104,427
| -43% | -$1.06M |
|
2074
CALL
Camtek
CAMT
$6.9B
| $2.06M | ﹤0.01% |
24,400
+5,000
| +26% | +$337K |
|
2075
CALL
MACOM Technology Solutions
MTSI
$20.4B
| $2.06M | ﹤0.01% |
14,400
-5,500
| -28% | -$643K |
|
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.