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 | |
|---|---|---|---|---|---|---|
6726
PUT
Malibu Boats
MBUU
$559M
| $21K | ﹤0.01% |
700
+600
| +600% | +$18.1K |
|
6727
CALL
Maximus
MMS
$3.31B
| $21K | ﹤0.01% |
+300
| New | +$21.1K |
|
6728
CALL
Movado Group
MOV
$846M
| $21K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$19.9K |
|
|
MSB
6729
CALL
Mesabi Trust
MSB
$300M
| $21K | ﹤0.01% |
900
-1,500
| -63% | -$39K |
|
6730
Simplify MBS ETF
MTBA
$1.52B
| $21K | ﹤0.01% |
428
+128
| +43% | +$6.37K |
|
6731
PUT
New Mountain Finance
NMFC
$668M
| $21K | ﹤0.01% |
2,000
+1,800
| +900% | +$18.6K |
|
6732
Neuropace
NPCE
$522M
| $21K | ﹤0.01% |
1,895
+1,834
| +3,007% | +$22.9K |
|
6733
Northwest Natural Holdings
NWN
$2.18B
| $21K | ﹤0.01% |
+536
| New | +$22.2K |
|
6734
CALL
Prosperity Bancshares
PB
$8.82B
| $21K | ﹤0.01% |
300
+200
| +200% | +$13.8K |
|
|
IMVP
6735
Invesco India ETF
IMVP
$125M
| $21K | ﹤0.01% |
788
+587
| +292% | +$15.2K |
|
6736
Purple Innovation
PRPL
$35.7M
| $21K | ﹤0.01% |
1,164
+431
| +59% | +$7.94K |
|
6737
PUT
Alpha Architect US Quantitative Value ETF
QVAL
$590M
| $21K | ﹤0.01% |
700
+100
| +17% | +$4.25K |
|
|
RC
6738
Ready Capital
RC
$261M
| $21K | ﹤0.01% |
+4,971
| New | +$22.1K |
|
6739
PUT
RPC Inc
RES
$1.14B
| $21K | ﹤0.01% |
4,600
+3,200
| +229% | +$15.4K |
|
6740
SunCoke Energy
SXC
$779M
| $21K | ﹤0.01% |
2,446
-228
| -9% | -$1.98K |
|
6741
PUT
TaskUs
TASK
$568M
| $21K | ﹤0.01% |
1,300
-700
| -35% | -$10.7K |
|
6742
Direxion Daily Technology Bear 3x ETF
TECS
$76.7M
| $21K | ﹤0.01% |
+80
| New | +$35.2K |
|
6743
UDR
UDR
$12.7B
| $21K | ﹤0.01% |
534
-176
| -25% | -$7.29K |
|
6744
CALL
Usana Health Sciences
USNA
$429M
| $21K | ﹤0.01% |
700
-1,800
| -72% | -$51.1K |
|
6745
PUT
Voya Financial
VOYA
$9.07B
| $21K | ﹤0.01% |
300
-6,100
| -95% | -$391K |
|
6746
PUT
Arlo Technologies
ARLO
$1.55B
| $20K | ﹤0.01% |
+1,200
| New | +$15.3K |
|
6747
AudioCodes
AUDC
$249M
| $20K | ﹤0.01% |
2,111
-2,267
| -52% | -$20.8K |
|
6748
PUT
Bank of Hawaii
BOH
$3.16B
| $20K | ﹤0.01% |
300
+100
| +50% | +$6.65K |
|
6749
PUT
Crown Holdings
CCK
$13.2B
| $20K | ﹤0.01% |
200
+100
| +100% | +$9.52K |
|
6750
PUT
Cirrus Logic
CRUS
$6.87B
| $20K | ﹤0.01% |
200
-20,400
| -99% | -$2M |
|
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.