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 | |
|---|---|---|---|---|---|---|
4376
PUT
nVent Electric
NVT
$22.1B
| $227K | ﹤0.01% |
3,100
-13,700
| -82% | -$841K |
|
4377
PUT
Open Text
OTEX
$6.36B
| $227K | ﹤0.01% |
7,800
-28,900
| -79% | -$785K |
|
4378
CALL
Pacific Biosciences
PACB
$447M
| $227K | ﹤0.01% |
183,200
-45,600
| -20% | -$52.7K |
|
4379
Skywest
SKYW
$4.4B
| $227K | ﹤0.01% |
2,205
-2,210
| -50% | -$210K |
|
|
WNS
4380
PUT
DELISTED
WNS Holdings
WNS
| $227K | ﹤0.01% |
3,600
-5,200
| -59% | -$312K |
|
4381
Clarivate
CLVT
$1.3B
| $226K | ﹤0.01% |
52,739
+45,001
| +582% | +$181K |
|
4382
PUT
Cardiff Oncology
CRDF
$63.2M
| $226K | ﹤0.01% |
71,900
+46,600
| +184% | +$142K |
|
|
ESPR
4383
DELISTED
Esperion Therapeutics
ESPR
| $226K | ﹤0.01% |
230,463
+83,722
| +57% | +$83.8K |
|
|
YETH
4384
Roundhill Ether Covered Call Strategy ETF
YETH
$59.8M
| $226K | ﹤0.01% |
9,066
+7,351
| +429% | +$184K |
|
4385
CALL
Lazard
LAZ
$4.07B
| $225K | ﹤0.01% |
4,700
+2,900
| +161% | +$121K |
|
4386
PUT
Elbit Systems
ESLT
$37B
| $224K | ﹤0.01% |
500
| – | – |
|
4387
First Watch Restaurant Group
FWRG
$824M
| $224K | ﹤0.01% |
+14,007
| New | +$235K |
|
4388
CALL
Genco Shipping & Trading
GNK
$1.11B
| $224K | ﹤0.01% |
17,200
+14,300
| +493% | +$189K |
|
4389
PUT
Incyte
INCY
$25.6B
| $224K | ﹤0.01% |
3,300
-7,800
| -70% | -$494K |
|
4390
PUT
Merit Medical Systems
MMSI
$4.78B
| $224K | ﹤0.01% |
2,400
+2,300
| +2,300% | +$218K |
|
4391
PUT
Newell Brands
NWL
$2.24B
| $224K | ﹤0.01% |
41,600
-140,400
| -77% | -$744K |
|
4392
PUT
Arcturus Therapeutics
ARCT
$166M
| $223K | ﹤0.01% |
17,200
+9,800
| +132% | +$116K |
|
4393
CALL
Regenxbio
RGNX
$628M
| $223K | ﹤0.01% |
27,200
+15,500
| +132% | +$130K |
|
4394
Tradr TSLA Bear Daily ETF
TSLQ
$148M
| $223K | ﹤0.01% |
+4,077
| New | +$318K |
|
4395
Babcock & Wilcox
BW
$1.25B
| $222K | ﹤0.01% |
231,544
+224,453
| +3,165% | +$153K |
|
4396
Celcuity
CELC
$4.09B
| $222K | ﹤0.01% |
+16,642
| New | +$181K |
|
4397
CALL
EverQuote
EVER
$966M
| $222K | ﹤0.01% |
9,200
+8,700
| +1,740% | +$206K |
|
4398
CALL
Matsons
MATX
$6.17B
| $222K | ﹤0.01% |
2,000
-4,400
| -69% | -$481K |
|
4399
CALL
Worthington Enterprises
WOR
$2.78B
| $222K | ﹤0.01% |
+3,500
| New | +$194K |
|
|
OSG
4400
Octave Specialty Group
OSG
$258M
| $221K | ﹤0.01% |
31,219
-99,452
| -76% | -$741K |
|
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.