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 | |
|---|---|---|---|---|---|---|
|
SGI
3801
PUT
Somnigroup International
SGI
$15.2B
| $381K | ﹤0.01% |
5,600
-20,500
| -79% | -$1.29M |
|
3802
CALL
AnaptysBio
ANAB
$1.54B
| $379K | ﹤0.01% |
17,100
+6,500
| +61% | +$136K |
|
3803
YieldMax Ultra Option Income Strategy ETF
ULTY
$762M
| $379K | ﹤0.01% |
+6,017
| New | +$363K |
|
3804
PUT
Loar Holdings
LOAR
$6.7B
| $379K | ﹤0.01% |
4,400
+3,400
| +340% | +$294K |
|
3805
PUT
Evercore
EVR
$13.2B
| $378K | ﹤0.01% |
1,400
-4,300
| -75% | -$946K |
|
3806
CALL
Limbach Holdings
LMB
$864M
| $378K | ﹤0.01% |
2,700
+700
| +35% | +$79.5K |
|
|
TGB
3807
CALL
Trekor Metals
TGB
$2.52B
| $378K | ﹤0.01% |
120,300
+30,200
| +34% | +$70.7K |
|
|
MNTN
3808
MNTN Inc
MNTN
$707M
| $378K | ﹤0.01% |
+17,302
| New | +$398K |
|
|
DCH
3809
CALL
Dauch Corp
DCH
$1.33B
| $377K | ﹤0.01% |
92,600
-17,500
| -16% | -$70.5K |
|
3810
PUT
Funko
FNKO
$355M
| $377K | ﹤0.01% |
79,300
+75,400
| +1,933% | +$344K |
|
3811
nCino
NCNO
$2.03B
| $377K | ﹤0.01% |
13,497
+6,184
| +85% | +$154K |
|
|
DNB
3812
DELISTED
Dun & Bradstreet
DNB
| $376K | ﹤0.01% |
41,437
-59,474
| -59% | -$533K |
|
3813
CALL
Hycroft Mining Holding Corp
HYMC
$1.84B
| $376K | ﹤0.01% |
120,200
+106,700
| +790% | +$349K |
|
3814
PUT
Old Republic International
ORI
$10.8B
| $376K | ﹤0.01% |
9,800
-4,400
| -31% | -$166K |
|
3815
PUT
Virgin Galactic
SPCE
$320M
| $376K | ﹤0.01% |
137,900
-28,400
| -17% | -$86.9K |
|
|
SVC
3816
Service Properties Trust
SVC
$1.09B
| $376K | ﹤0.01% |
31,512
+21,724
| +222% | +$235K |
|
3817
CALL
Upbound Group
UPBD
$1.26B
| $376K | ﹤0.01% |
15,000
+6,300
| +72% | +$147K |
|
3818
PUT
CryoPort
CYRX
$765M
| $375K | ﹤0.01% |
50,400
+9,600
| +24% | +$59.6K |
|
3819
Sonos
SONO
$2B
| $375K | ﹤0.01% |
34,717
+2,814
| +9% | +$27.4K |
|
3820
CALL
Beam Therapeutics
BEAM
$2.7B
| $374K | ﹤0.01% |
22,000
-6,400
| -23% | -$111K |
|
3821
CALL
Q2 Holdings
QTWO
$3.71B
| $374K | ﹤0.01% |
4,000
-6,000
| -60% | -$506K |
|
3822
CALL
Rentokil
RTO
$14.5B
| $374K | ﹤0.01% |
15,600
+11,900
| +322% | +$276K |
|
3823
PUT
Ryanair
RYAAY
$31.1B
| $374K | ﹤0.01% |
6,500
+5,000
| +333% | +$254K |
|
3824
CALL
Atour Lifestyle Holdings
ATAT
$4.77B
| $373K | ﹤0.01% |
11,500
-59,500
| -84% | -$1.69M |
|
3825
ITT
ITT
$17.8B
| $373K | ﹤0.01% |
+2,381
| New | +$339K |
|
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.