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 | Miscellaneous | 98.27% |
| 2 | Technology | 0.74% |
| 3 | Communication Services | 0.19% |
| 4 | Consumer Discretionary | 0.18% |
| 5 | Healthcare | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1451
PUT
Ares Capital
ARCC
$14.4B
| $4.41M | ﹤0.01% |
201,000
+62,300
| +45% | +$1.32M |
|
1452
PUT
TG Therapeutics
TGTX
$8.57B
| $4.41M | ﹤0.01% |
122,600
-80,300
| -40% | -$2.99M |
|
1453
PUT
Levi Strauss
LEVI
$8.1B
| $4.41M | ﹤0.01% |
238,600
+152,200
| +176% | +$2.53M |
|
1454
XPeng
XPEV
$10.5B
| $4.4M | ﹤0.01% |
+246,121
| New | +$4.81M |
|
1455
PUT
Cenovus Energy
CVE
$59.7B
| $4.39M | ﹤0.01% |
323,100
-242,700
| -43% | -$3.15M |
|
|
EH
1456
PUT
EHang Holdings
EH
$356M
| $4.39M | ﹤0.01% |
253,100
-100,400
| -28% | -$1.7M |
|
1457
CALL
Sony
SONY
$143B
| $4.39M | ﹤0.01% |
168,800
-207,800
| -55% | -$5.2M |
|
1458
CALL
Credit Acceptance
CACC
$6.28B
| $4.38M | ﹤0.01% |
8,600
+6,800
| +378% | +$3.34M |
|
1459
PUT
Yum China
YUMC
$14.8B
| $4.38M | ﹤0.01% |
97,900
-4,100
| -4% | -$183K |
|
1460
CALL
POET Technologies
POET
$1.37B
| $4.38M | ﹤0.01% |
839,900
+105,900
| +14% | +$446K |
|
|
QXO
1461
QXO Inc
QXO
$13.9B
| $4.37M | ﹤0.01% |
202,888
+68,303
| +51% | +$1.12M |
|
|
EH
1462
CALL
EHang Holdings
EH
$356M
| $4.37M | ﹤0.01% |
251,500
+128,100
| +104% | +$2.17M |
|
1463
PUT
Harley-Davidson
HOG
$2.95B
| $4.37M | ﹤0.01% |
185,000
+31,200
| +20% | +$741K |
|
1464
PUT
L3Harris
LHX
$47.8B
| $4.36M | ﹤0.01% |
17,400
+9,200
| +112% | +$2.11M |
|
1465
PUT
HF Sinclair
DINO
$18.7B
| $4.36M | ﹤0.01% |
106,200
-92,000
| -46% | -$3.17M |
|
1466
PUT
Magnite
MGNI
$3.46B
| $4.36M | ﹤0.01% |
180,700
+96,200
| +114% | +$1.42M |
|
1467
PUT
Sweetgreen
SG
$814M
| $4.36M | ﹤0.01% |
292,700
+107,400
| +58% | +$1.77M |
|
|
HOLX
1468
PUT
DELISTED
Hologic
HOLX
| $4.35M | ﹤0.01% |
66,700
+50,200
| +304% | +$3.01M |
|
1469
Sunrun
RUN
$2.14B
| $4.34M | ﹤0.01% |
530,872
+462,813
| +680% | +$3.64M |
|
1470
PUT
GXO Logistics
GXO
$5.54B
| $4.34M | ﹤0.01% |
89,100
-54,100
| -38% | -$2.16M |
|
1471
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.35B
| $4.34M | ﹤0.01% |
33,200
-11,200
| -25% | -$713K |
|
|
PR
1472
CALL
Permian Resources
PR
$19.6B
| $4.33M | ﹤0.01% |
318,300
+134,000
| +73% | +$1.72M |
|
1473
PUT
Cintas
CTAS
$80.2B
| $4.32M | ﹤0.01% |
19,400
-11,500
| -37% | -$2.48M |
|
1474
Canadian Pacific Kansas City
CP
$80.5B
| $4.32M | ﹤0.01% |
54,477
-38,742
| -42% | -$2.98M |
|
1475
PUT
Tidewater
TDW
$4.69B
| $4.32M | ﹤0.01% |
93,600
+36,900
| +65% | +$1.49M |
|
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's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.
- 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 1,524 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.