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 | |
|---|---|---|---|---|---|---|
3901
PUT
Utz Brands
UTZ
$1.25B
| $348K | ﹤0.01% |
27,800
+24,000
| +632% | +$314K |
|
3902
Cullen/Frost Bankers
CFR
$10.5B
| $347K | ﹤0.01% |
2,707
+1,595
| +143% | +$195K |
|
3903
Invesco CurrencyShares Australian Dollar Trust
FXA
$96.7M
| $347K | ﹤0.01% |
+5,331
| New | +$338K |
|
3904
CALL
Landstar System
LSTR
$6.29B
| $347K | ﹤0.01% |
2,500
+1,100
| +79% | +$153K |
|
3905
PUT
Suzano
SUZ
$10.4B
| $347K | ﹤0.01% |
36,900
+32,400
| +720% | +$297K |
|
3906
CALL
Talos Energy
TALO
$2.28B
| $347K | ﹤0.01% |
41,000
+32,800
| +400% | +$263K |
|
3907
Elevance Health
ELV
$83.7B
| $346K | ﹤0.01% |
891
-908
| -50% | -$365K |
|
3908
CALL
EyePoint Inc
EYPT
$1B
| $345K | ﹤0.01% |
36,700
+18,600
| +103% | +$128K |
|
3909
CALL
Granite Construction
GVA
$5.31B
| $345K | ﹤0.01% |
3,700
+2,700
| +270% | +$227K |
|
3910
PUT
A2Z Smart Technologies
AZ
$263M
| $344K | ﹤0.01% |
32,600
+29,200
| +859% | +$250K |
|
3911
CALL
Paylocity
PCTY
$7.43B
| $344K | ﹤0.01% |
1,900
+1,500
| +375% | +$282K |
|
|
MRX
3912
CALL
Marex Group Limited Ordinary Shares
MRX
$4.62B
| $343K | ﹤0.01% |
8,700
+3,200
| +58% | +$133K |
|
|
CTLP
3913
CALL
DELISTED
Cantaloupe
CTLP
| $342K | ﹤0.01% |
31,200
+29,400
| +1,633% | +$254K |
|
3914
CALL
Installed Building Products
IBP
$6.47B
| $342K | ﹤0.01% |
1,900
+1,100
| +138% | +$183K |
|
3915
Peloton Interactive
PTON
$2.84B
| $342K | ﹤0.01% |
49,409
-58,268
| -54% | -$378K |
|
3916
CVR Energy
CVI
$3.39B
| $341K | ﹤0.01% |
+12,714
| New | +$280K |
|
3917
PUT
Federal Realty Investment Trust
FRT
$10.9B
| $341K | ﹤0.01% |
3,600
+1,700
| +89% | +$161K |
|
3918
CALL
Aldeyra Therapeutics
ALDX
$95.3M
| $340K | ﹤0.01% |
88,900
+39,100
| +79% | +$101K |
|
3919
CALL
CryoPort
CYRX
$765M
| $340K | ﹤0.01% |
45,600
+37,800
| +485% | +$235K |
|
3920
Best Buy
BBY
$18.9B
| $339K | ﹤0.01% |
+5,055
| New | +$343K |
|
3921
Magnolia Oil & Gas
MGY
$5.55B
| $339K | ﹤0.01% |
+15,101
| New | +$334K |
|
3922
Western Alliance Bancorporation
WAL
$9.13B
| $339K | ﹤0.01% |
4,355
-3,444
| -44% | -$247K |
|
|
JFIN
3923
PUT
Jiayin Group
JFIN
$115M
| $338K | ﹤0.01% |
21,100
+1,000
| +5% | +$13.6K |
|
3924
Sundial Growers
SNDL
$318M
| $338K | ﹤0.01% |
279,500
-46,475
| -14% | -$61.9K |
|
3925
CALL
TransAlta
TAC
$4.03B
| $338K | ﹤0.01% |
31,400
-800
| -2% | -$7.62K |
|
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.