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 | |
|---|---|---|---|---|---|---|
4601
TORM
TRMD
$3.05B
| $183K | ﹤0.01% |
11,026
-13,049
| -54% | -$218K |
|
4602
PUT
Upbound Group
UPBD
$1.22B
| $183K | ﹤0.01% |
7,300
+5,400
| +284% | +$126K |
|
4603
CALL
VSE Corp
VSEC
$5.19B
| $183K | ﹤0.01% |
1,400
| – | – |
|
4604
PUT
Globus Medical
GMED
$11.1B
| $182K | ﹤0.01% |
3,100
+1,800
| +138% | +$116K |
|
4605
Hormel Foods
HRL
$14.2B
| $182K | ﹤0.01% |
6,030
-4,950
| -45% | -$149K |
|
4606
Hyliion Holdings
HYLN
$578M
| $182K | ﹤0.01% |
137,971
+134,039
| +3,409% | +$195K |
|
4607
CALL
IDEAYA Biosciences
IDYA
$3.43B
| $182K | ﹤0.01% |
8,700
+2,900
| +50% | +$55.6K |
|
4608
PUT
Independent Bank
INDB
$4.04B
| $182K | ﹤0.01% |
+2,900
| New | +$176K |
|
4609
PUT
Macerich
MAC
$7.4B
| $182K | ﹤0.01% |
11,300
-7,300
| -39% | -$113K |
|
4610
CALL
Progyny
PGNY
$2.46B
| $182K | ﹤0.01% |
8,300
-25,100
| -75% | -$551K |
|
4611
CALL
Protagonist Therapeutics
PTGX
$8.55B
| $182K | ﹤0.01% |
3,300
-9,900
| -75% | -$475K |
|
4612
PUT
Scholastic
SCHL
$774M
| $182K | ﹤0.01% |
8,700
-700
| -7% | -$12.7K |
|
4613
PUT
Westlake Corp
WLK
$9.26B
| $182K | ﹤0.01% |
2,400
+1,900
| +380% | +$155K |
|
|
BWAY
4614
CALL
Brainsway
BWAY
$568M
| $181K | ﹤0.01% |
27,600
+200
| +0.7% | +$993 |
|
|
GAMB
4615
DELISTED
Gambling.com
GAMB
| $181K | ﹤0.01% |
15,294
+11,395
| +292% | +$140K |
|
4616
PUT
Leggett & Platt
LEG
$1.4B
| $181K | ﹤0.01% |
20,400
-15,800
| -44% | -$136K |
|
4617
Navios Maritime Partners
NMM
$2.22B
| $181K | ﹤0.01% |
+4,816
| New | +$178K |
|
|
QIPT
4618
DELISTED
Quipt Home Medical
QIPT
| $181K | ﹤0.01% |
+101,570
| New | +$200K |
|
4619
PUT
Weatherford International
WFRD
$5.9B
| $181K | ﹤0.01% |
3,600
+1,200
| +50% | +$55.7K |
|
4620
CALL
Xylem
XYL
$28.5B
| $181K | ﹤0.01% |
1,400
-2,400
| -63% | -$291K |
|
|
NAGE
4621
PUT
Niagen Bioscience
NAGE
$256M
| $181K | ﹤0.01% |
12,600
+7,200
| +133% | +$71.1K |
|
4622
PUT
Aecom
ACM
$9.46B
| $180K | ﹤0.01% |
1,600
-4,800
| -75% | -$498K |
|
4623
PUT
Adient
ADNT
$1.69B
| $180K | ﹤0.01% |
9,300
-8,800
| -49% | -$130K |
|
4624
PUT
Crexendo
CXDO
$217M
| $180K | ﹤0.01% |
29,800
-3,000
| -9% | -$15.7K |
|
4625
PUT
Lear
LEA
$7.39B
| $180K | ﹤0.01% |
1,900
-15,200
| -89% | -$1.34M |
|
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.