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 | |
|---|---|---|---|---|---|---|
4626
Suzano
SUZ
$10.2B
| $180K | ﹤0.01% |
19,135
+16,120
| +535% | +$148K |
|
|
NAGE
4627
CALL
Niagen Bioscience
NAGE
$256M
| $180K | ﹤0.01% |
12,500
+700
| +6% | +$6.91K |
|
|
TGR
4628
PUT
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $180K | ﹤0.01% |
5,700
+3,800
| +200% | +$120K |
|
4629
Entravision Communication
EVC
$1.02B
| $179K | ﹤0.01% |
77,554
+70,586
| +1,013% | +$142K |
|
4630
PUT
OSI Systems
OSIS
$3.53B
| $179K | ﹤0.01% |
800
-3,300
| -80% | -$704K |
|
|
PRO
4631
DELISTED
PROS Holdings
PRO
| $179K | ﹤0.01% |
+11,480
| New | +$195K |
|
4632
PUT
USA Compression Partners
USAC
$3.69B
| $179K | ﹤0.01% |
7,400
+4,300
| +139% | +$107K |
|
4633
WillScot Mobile Mini Holdings
WSC
$4.37B
| $179K | ﹤0.01% |
+6,535
| New | +$174K |
|
|
DSL
4634
CALL
DoubleLine Income Solutions Fund
DSL
$1.22B
| $178K | ﹤0.01% |
14,600
+4,200
| +40% | +$50.6K |
|
|
ETWO
4635
CALL
DELISTED
E2open Parent Holdings
ETWO
| $178K | ﹤0.01% |
55,300
-114,400
| -67% | -$301K |
|
4636
Hamilton Insurance Group
HG
$3.63B
| $178K | ﹤0.01% |
+8,260
| New | +$166K |
|
4637
Lloyds Banking Group
LYG
$85.2B
| $178K | ﹤0.01% |
42,016
+22,939
| +120% | +$91.2K |
|
4638
Marqeta
MQ
$1.93B
| $178K | ﹤0.01% |
7,669
-84,017
| -92% | -$1.59M |
|
4639
PUT
Reinsurance Group of America
RGA
$15.5B
| $178K | ﹤0.01% |
900
-300
| -25% | -$58.6K |
|
4640
PUT
DoubleVerify
DV
$1.77B
| $176K | ﹤0.01% |
11,800
+3,100
| +36% | +$42.5K |
|
4641
PUT
Essent Group
ESNT
$6.28B
| $176K | ﹤0.01% |
+2,900
| New | +$167K |
|
4642
PUT
Genworth Financial
GNW
$3.86B
| $176K | ﹤0.01% |
22,700
+9,700
| +75% | +$67.8K |
|
4643
ReNew
RNW
$2.18B
| $176K | ﹤0.01% |
+25,473
| New | +$166K |
|
4644
PUT
Revolution Medicines
RVMD
$38.5B
| $176K | ﹤0.01% |
4,800
-100
| -2% | -$3.84K |
|
4645
PUT
Vuzix
VUZI
$178M
| $176K | ﹤0.01% |
60,500
+38,800
| +179% | +$91.6K |
|
4646
CALL
F&G Annuities & Life
FG
$3.91B
| $175K | ﹤0.01% |
5,500
+300
| +6% | +$9.96K |
|
|
KLG
4647
CALL
DELISTED
WK Kellogg Co
KLG
| $175K | ﹤0.01% |
11,000
+2,500
| +29% | +$43.5K |
|
4648
PUT
Kimbell Royalty Partners
KRP
$1.46B
| $175K | ﹤0.01% |
12,600
-82,700
| -87% | -$1.08M |
|
4649
AtaiBeckley Inc
ATAI
$2.66B
| $174K | ﹤0.01% |
+79,533
| New | +$143K |
|
4650
Direxion Daily MSFT Bull 2X ETF
MSFU
$819M
| $174K | ﹤0.01% |
3,506
-9,524
| -73% | -$372K |
|
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.