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 | |
|---|---|---|---|---|---|---|
1651
Applied Digital
APLD
$7.77B
| $3.47M | ﹤0.01% |
344,461
+86,874
| +34% | +$641K |
|
1652
PUT
Brown-Forman Class B
BF.B
$12B
| $3.47M | ﹤0.01% |
128,800
+23,900
| +23% | +$767K |
|
1653
CALL
Nektar Therapeutics
NKTR
$2.39B
| $3.45M | ﹤0.01% |
133,600
+133,500
| +133,500% | +$1.5M |
|
1654
CALL
Entegris
ENTG
$19.7B
| $3.45M | ﹤0.01% |
42,800
+28,200
| +193% | +$2.14M |
|
1655
CALL
Owens Corning
OC
$11.5B
| $3.45M | ﹤0.01% |
25,100
+15,700
| +167% | +$2.17M |
|
1656
PUT
Capricor Therapeutics
CAPR
$1.14B
| $3.44M | ﹤0.01% |
346,800
+269,200
| +347% | +$2.84M |
|
1657
PUT
Ovintiv
OVV
$17.7B
| $3.44M | ﹤0.01% |
90,500
+49,500
| +121% | +$1.82M |
|
1658
Kraft Heinz
KHC
$30.4B
| $3.44M | ﹤0.01% |
+133,311
| New | +$3.7M |
|
1659
PUT
XP
XP
$8.62B
| $3.44M | ﹤0.01% |
170,300
+62,300
| +58% | +$1.08M |
|
1660
CALL
International Flavors & Fragrances
IFF
$19.4B
| $3.43M | ﹤0.01% |
46,700
+24,400
| +109% | +$1.84M |
|
1661
CALL
Sherwin-Williams
SHW
$78.3B
| $3.43M | ﹤0.01% |
10,000
-5,800
| -37% | -$2.01M |
|
1662
CALL
Valvoline
VVV
$4.97B
| $3.43M | ﹤0.01% |
90,500
+22,300
| +33% | +$780K |
|
1663
State Street SPDR S&P Homebuilders ETF
XHB
$1.74B
| $3.43M | ﹤0.01% |
+34,770
| New | +$3.31M |
|
1664
PUT
KULR Technology Group
KULR
$117M
| $3.42M | ﹤0.01% |
479,400
+433,212
| +938% | +$4.11M |
|
1665
CALL
Deutsche Bank
DB
$66.3B
| $3.41M | ﹤0.01% |
116,400
-363,200
| -76% | -$9.59M |
|
1666
CALL
Aehr Test Systems
AEHR
$2.48B
| $3.39M | ﹤0.01% |
262,400
+2,600
| +1% | +$24.7K |
|
1667
JD.com
JD
$40.8B
| $3.39M | ﹤0.01% |
103,904
-137,294
| -57% | -$4.68M |
|
|
SII
1668
CALL
Sprott
SII
$2.65B
| $3.38M | ﹤0.01% |
49,000
+43,100
| +731% | +$2.4M |
|
1669
CALL
Huntington Bancshares
HBAN
$35.1B
| $3.38M | ﹤0.01% |
201,900
-24,800
| -11% | -$374K |
|
1670
CALL
Logitech
LOGI
$15.2B
| $3.38M | ﹤0.01% |
37,500
-19,700
| -34% | -$1.6M |
|
|
GRAL
1671
CALL
GRAIL Inc
GRAL
$2.91B
| $3.37M | ﹤0.01% |
65,500
+43,000
| +191% | +$1.56M |
|
1672
PUT
Root
ROOT
$917M
| $3.37M | ﹤0.01% |
26,300
+3,300
| +14% | +$447K |
|
1673
PUT
NetEase
NTES
$76.5B
| $3.36M | ﹤0.01% |
25,000
-50,700
| -67% | -$5.83M |
|
1674
CALL
Kohl's
KSS
$2.03B
| $3.36M | ﹤0.01% |
396,500
-358,000
| -47% | -$2.75M |
|
1675
CALL
Calumet Specialty Products
CLMT
$3.63B
| $3.35M | ﹤0.01% |
212,900
-3,400
| -2% | -$43.2K |
|
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.