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 | |
|---|---|---|---|---|---|---|
2326
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $1.57M | ﹤0.01% |
5,200
-3,800
| -42% | -$1.13M |
|
2327
NetEase
NTES
$76.5B
| $1.57M | ﹤0.01% |
+11,685
| New | +$1.34M |
|
2328
ODDITY Tech
ODD
$708M
| $1.57M | ﹤0.01% |
20,790
-23,268
| -53% | -$1.42M |
|
2329
PUT
Signet Jewelers
SIG
$3.55B
| $1.57M | ﹤0.01% |
19,700
-8,500
| -30% | -$565K |
|
2330
Ionis Pharmaceuticals
IONS
$9.35B
| $1.57M | ﹤0.01% |
39,638
-24,943
| -39% | -$816K |
|
2331
CALL
Microvast
MVST
$267M
| $1.56M | ﹤0.01% |
430,600
+245,700
| +133% | +$718K |
|
2332
CALL
Ralph Lauren
RL
$22.2B
| $1.56M | ﹤0.01% |
5,700
-5,300
| -48% | -$1.31M |
|
2333
CALL
Ecolab
ECL
$75.6B
| $1.56M | ﹤0.01% |
5,800
-9,300
| -62% | -$2.36M |
|
2334
Alliance Resource Partners
ARLP
$3.18B
| $1.56M | ﹤0.01% |
59,724
+8,392
| +16% | +$220K |
|
2335
CALL
Aramark
ARMK
$15B
| $1.56M | ﹤0.01% |
37,300
+20,900
| +127% | +$776K |
|
2336
PUT
Plains GP Holdings
PAGP
$5.23B
| $1.56M | ﹤0.01% |
80,300
-132,700
| -62% | -$2.47M |
|
|
TPC
2337
CALL
Tutor Perini Cor
TPC
$4.57B
| $1.56M | ﹤0.01% |
33,300
+23,700
| +247% | +$754K |
|
2338
PUT
Motorola Solutions
MSI
$69.4B
| $1.55M | ﹤0.01% |
3,700
+2,300
| +164% | +$962K |
|
|
EMBJ
2339
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $1.55M | ﹤0.01% |
27,300
-87,500
| -76% | -$4.13M |
|
2340
CALL
GigaCloud Technology
GCT
$1.35B
| $1.55M | ﹤0.01% |
78,500
-106,700
| -58% | -$1.71M |
|
2341
CALL
Zimmer Biomet
ZBH
$17.7B
| $1.55M | ﹤0.01% |
17,000
+6,500
| +62% | +$629K |
|
2342
CALL
Blackstone Mortgage Trust
BXMT
$2.82B
| $1.55M | ﹤0.01% |
80,500
-27,800
| -26% | -$527K |
|
2343
CALL
Anavex Life Sciences
AVXL
$222M
| $1.55M | ﹤0.01% |
168,000
-45,400
| -21% | -$388K |
|
2344
CALL
Ambarella
AMBA
$2.99B
| $1.54M | ﹤0.01% |
23,400
-1,000
| -4% | -$53K |
|
2345
PUT
Barclays
BCS
$94.1B
| $1.54M | ﹤0.01% |
83,100
-124,500
| -60% | -$2.06M |
|
2346
CALL
Argan
AGX
$7.98B
| $1.54M | ﹤0.01% |
7,000
-3,800
| -35% | -$685K |
|
2347
PUT
Hecla Mining
HL
$10.2B
| $1.54M | ﹤0.01% |
257,600
+64,200
| +33% | +$354K |
|
2348
CALL
Vanguard S&P 500 Growth ETF
VOOG
$25.4B
| $1.54M | ﹤0.01% |
24,000
+19,200
| +400% | +$1.14M |
|
2349
Align Technology
ALGN
$12B
| $1.54M | ﹤0.01% |
8,147
-203
| -2% | -$35.9K |
|
2350
PUT
Huntsman Corp
HUN
$2.24B
| $1.54M | ﹤0.01% |
148,000
+135,100
| +1,047% | +$1.65M |
|
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.