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 | |
|---|---|---|---|---|---|---|
4076
Ashland
ASH
$3.11B
| $297K | ﹤0.01% |
5,926
+1,954
| +49% | +$99.3K |
|
4077
First Trust NASDAQ Cybersecurity ETF
CIBR
$14B
| $296K | ﹤0.01% |
+3,919
| New | +$269K |
|
4078
PUT
MaxLinear
MXL
$5.35B
| $296K | ﹤0.01% |
20,900
-1,100
| -5% | -$12.7K |
|
4079
PUT
Global X MSCI Norway ETF
NORW
$85M
| $296K | ﹤0.01% |
3,500
+2,900
| +483% | +$80.3K |
|
|
BAND
4080
CALL
Bandwidth Inc
BAND
$1.67B
| $295K | ﹤0.01% |
18,600
-2,200
| -11% | -$29.9K |
|
4081
PUT
Fabrinet
FN
$16.1B
| $294K | ﹤0.01% |
1,000
-13,300
| -93% | -$2.96M |
|
4082
Molina Healthcare
MOH
$10.5B
| $294K | ﹤0.01% |
+988
| New | +$310K |
|
4083
PUT
National Health Investors
NHI
$3.81B
| $294K | ﹤0.01% |
+4,200
| New | +$308K |
|
4084
Vanda Pharmaceuticals
VNDA
$310M
| $294K | ﹤0.01% |
+62,316
| New | +$272K |
|
4085
PUT
Beazer Homes USA
BZH
$913M
| $293K | ﹤0.01% |
13,100
+10,800
| +470% | +$224K |
|
4086
Cooper Companies
COO
$14.1B
| $293K | ﹤0.01% |
+4,127
| New | +$316K |
|
4087
CALL
Kopin
KOPN
$654M
| $293K | ﹤0.01% |
192,000
+19,500
| +11% | +$25.4K |
|
4088
PUT
Precigen
PGEN
$1.97B
| $293K | ﹤0.01% |
+206,400
| New | +$293K |
|
|
RVPH
4089
CALL
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $293K | ﹤0.01% |
38,500
-8,130
| -17% | -$127K |
|
|
FMDG
4090
PUT
DELISTED
Fieldstone Merlin Dynamic Large Cap Growth ETF
FMDG
| $293K | ﹤0.01% |
+6,800
| New | +$293K |
|
4091
CALL
American Century Diversified Corporate Bond ETF
KORP
$873M
| $292K | ﹤0.01% |
3,300
-3,800
| -54% | -$175K |
|
4092
ProShares UltraPro Russell2000
URTY
$330M
| $292K | ﹤0.01% |
+7,433
| New | +$245K |
|
4093
CALL
Winnebago Industries
WGO
$908M
| $292K | ﹤0.01% |
10,100
-17,400
| -63% | -$570K |
|
|
ZEPP
4094
PUT
Zepp Health
ZEPP
$68M
| $292K | ﹤0.01% |
110,100
| – | – |
|
|
ATYR
4095
PUT
aTyr Pharma
ATYR
$48.4M
| $292K | ﹤0.01% |
57,700
-228,400
| -80% | -$899K |
|
4096
Arcos Dorados Holdings
ARCO
$1.77B
| $291K | ﹤0.01% |
37,000
+36,181
| +4,418% | +$274K |
|
|
BLD
4097
PUT
DELISTED
TopBuild
BLD
| $291K | ﹤0.01% |
900
| – | – |
|
4098
CALL
InterDigital
IDCC
$6.72B
| $291K | ﹤0.01% |
1,300
-6,000
| -82% | -$1.27M |
|
|
PMT
4099
PUT
PennyMac Mortgage Investment
PMT
$854M
| $291K | ﹤0.01% |
22,700
+7,700
| +51% | +$98.1K |
|
|
SKE
4100
CALL
Skeena Resources
SKE
$3.28B
| $291K | ﹤0.01% |
18,300
+16,100
| +732% | +$203K |
|
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.