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 | |
|---|---|---|---|---|---|---|
6176
CALL
Texas Capital Bancshares
TCBI
$4.28B
| $39K | ﹤0.01% |
+500
| New | +$35.8K |
|
6177
PUT
Ternium
TX
$9.43B
| $39K | ﹤0.01% |
1,300
+500
| +63% | +$14.3K |
|
6178
State Street SPDR S&P Health Care Services ETF
XHS
$208M
| $39K | ﹤0.01% |
+393
| New | +$38.1K |
|
6179
PUT
ArcBest
ARCB
$3.16B
| $38K | ﹤0.01% |
500
-300
| -38% | -$19.5K |
|
6180
CALL
Bioceres Crop Solutions
BIOX
$20.6M
| $38K | ﹤0.01% |
8,600
+1,900
| +28% | +$8.56K |
|
6181
PUT
Chegg
CHGG
$116M
| $38K | ﹤0.01% |
31,700
-58,900
| -65% | -$54.5K |
|
|
CNTA
6182
PUT
DELISTED
Centessa Pharmaceuticals
CNTA
| $38K | ﹤0.01% |
2,900
+2,800
| +2,800% | +$35.5K |
|
6183
PUT
Ethan Allen Interiors
ETD
$600M
| $38K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$35.1K |
|
6184
PUT
First Industrial Realty Trust
FR
$8.66B
| $38K | ﹤0.01% |
800
-1,200
| -60% | -$58.5K |
|
6185
PUT
Grocery Outlet
GO
$904M
| $38K | ﹤0.01% |
3,100
+700
| +29% | +$9.95K |
|
6186
MillerKnoll
MLKN
$1.56B
| $38K | ﹤0.01% |
2,004
-2,806
| -58% | -$47.9K |
|
6187
CALL
Newmark Group
NMRK
$2.64B
| $38K | ﹤0.01% |
+3,200
| New | +$35.8K |
|
6188
PUT
Neuropace
NPCE
$465M
| $38K | ﹤0.01% |
3,500
+3,400
| +3,400% | +$42.5K |
|
6189
Ocugen
OCGN
$403M
| $38K | ﹤0.01% |
39,183
+11,592
| +42% | +$9.61K |
|
6190
Pacira BioSciences
PCRX
$1.04B
| $38K | ﹤0.01% |
1,598
-2,386
| -60% | -$60.1K |
|
6191
Invesco High Yield Equity Dividend Achievers ETF
PEY
$1.16B
| $38K | ﹤0.01% |
+1,875
| New | +$37.7K |
|
6192
Rezolute
RZLT
$453M
| $38K | ﹤0.01% |
8,634
+8,602
| +26,881% | +$31.9K |
|
6193
PUT
Stepan Co
SCL
$1.5B
| $38K | ﹤0.01% |
+700
| New | +$37K |
|
6194
CALL
Stereotaxis
STXS
$133M
| $38K | ﹤0.01% |
18,100
-16,200
| -47% | -$32.9K |
|
|
THRD
6195
PUT
DELISTED
Third Harmonic Bio
THRD
| $38K | ﹤0.01% |
+7,000
| New | +$34.9K |
|
6196
CALL
Entrada Therapeutics
TRDA
$254M
| $38K | ﹤0.01% |
5,800
+200
| +4% | +$1.61K |
|
|
CEPI
6197
REX Crypto Equity Premium Income ETF
CEPI
$103M
| $38K | ﹤0.01% |
949
+907
| +2,160% | +$34.5K |
|
|
QMFE
6198
PUT
FT Vest Nasdaq-100 Moderate Buffer ETF - February
QMFE
$47.5M
| $38K | ﹤0.01% |
1,900
+1,500
| +375% | +$29.3K |
|
6199
AllianceBernstein
AB
$3.47B
| $37K | ﹤0.01% |
+911
| New | +$35.7K |
|
6200
PUT
American Financial Group
AFG
$11.9B
| $37K | ﹤0.01% |
300
+200
| +200% | +$25K |
|
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.