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 | |
|---|---|---|---|---|---|---|
3476
PUT
AutoNation
AN
$7.1B
| $516K | ﹤0.01% |
2,600
-8,700
| -77% | -$1.57M |
|
3477
Globalstar
GSAT
$10.2B
| $516K | ﹤0.01% |
21,925
+5,711
| +35% | +$115K |
|
3478
CALL
Helen of Troy
HELE
$658M
| $516K | ﹤0.01% |
18,200
+5,500
| +43% | +$169K |
|
3479
Progressive
PGR
$125B
| $516K | ﹤0.01% |
+1,935
| New | +$530K |
|
3480
PUT
Boston Beer
SAM
$1.91B
| $515K | ﹤0.01% |
2,700
+1,900
| +238% | +$437K |
|
3481
Similarweb
SMWB
$598M
| $515K | ﹤0.01% |
65,770
+25,456
| +63% | +$191K |
|
3482
CALL
Crown Holdings
CCK
$12.9B
| $514K | ﹤0.01% |
5,000
-47,700
| -91% | -$4.54M |
|
|
LB
3483
CALL
LandBridge Co
LB
$2.1B
| $513K | ﹤0.01% |
7,600
+6,300
| +485% | +$454K |
|
|
CMPS
3484
Compass Pathways
CMPS
$1.52B
| $512K | ﹤0.01% |
183,031
+134,380
| +276% | +$506K |
|
3485
Weyerhaeuser
WY
$17.2B
| $511K | ﹤0.01% |
+19,929
| New | +$522K |
|
3486
CALL
AllianceBernstein
AB
$3.54B
| $510K | ﹤0.01% |
12,500
-21,700
| -63% | -$851K |
|
3487
CALL
Amplitude
AMPL
$1.15B
| $510K | ﹤0.01% |
41,200
+5,100
| +14% | +$55.2K |
|
3488
CALL
Ameresco
AMRC
$1.12B
| $508K | ﹤0.01% |
33,500
+30,900
| +1,188% | +$404K |
|
3489
Ardelyx
ARDX
$1.25B
| $508K | ﹤0.01% |
129,681
-213,693
| -62% | -$882K |
|
3490
PUT
First Bancorp
FNLC
$393M
| $508K | ﹤0.01% |
+20,000
| New | +$485K |
|
3491
PUT
Meritage Homes
MTH
$4.89B
| $508K | ﹤0.01% |
7,600
+2,200
| +41% | +$146K |
|
3492
PUT
Murphy Oil
MUR
$5.38B
| $508K | ﹤0.01% |
22,600
-102,800
| -82% | -$2.29M |
|
3493
PUT
Nokia
NOK
$51.8B
| $508K | ﹤0.01% |
98,200
-28,500
| -22% | -$147K |
|
3494
PUT
News Corp Class B
NWS
$16.7B
| $508K | ﹤0.01% |
17,100
+1,500
| +10% | +$47.5K |
|
3495
PUT
Toro Company
TTC
$9.01B
| $508K | ﹤0.01% |
7,200
+1,400
| +24% | +$99.3K |
|
3496
PUT
Performance Food Group
PFGC
$18B
| $507K | ﹤0.01% |
5,800
-19,600
| -77% | -$1.63M |
|
3497
Antero Midstream
AM
$10.4B
| $506K | ﹤0.01% |
+26,747
| New | +$478K |
|
3498
CALL
Flotek Industries
FTK
$881M
| $506K | ﹤0.01% |
34,300
+26,700
| +351% | +$308K |
|
3499
Western Union
WU
$2.55B
| $506K | ﹤0.01% |
+60,132
| New | +$571K |
|
3500
PUT
Herbalife
HLF
$1.26B
| $505K | ﹤0.01% |
58,700
-71,300
| -55% | -$530K |
|
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.