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 | |
|---|---|---|---|---|---|---|
2951
CALL
ING
ING
$95.9B
| $841K | ﹤0.01% |
38,500
-36,100
| -48% | -$729K |
|
2952
PUT
Verisk Analytics
VRSK
$26.9B
| $841K | ﹤0.01% |
2,700
+200
| +8% | +$60.6K |
|
2953
3M
MMM
$91.3B
| $840K | ﹤0.01% |
5,524
-46,615
| -89% | -$6.66M |
|
2954
CALL
Open Text
OTEX
$5.68B
| $840K | ﹤0.01% |
28,800
-48,900
| -63% | -$1.33M |
|
2955
PUT
Red Cat Holdings
RCAT
$1.2B
| $840K | ﹤0.01% |
115,400
+1,100
| +1% | +$7.18K |
|
2956
PUT
Ginkgo Bioworks
DNA
$496M
| $839K | ﹤0.01% |
74,600
-28,500
| -28% | -$221K |
|
2957
CALL
Burlington
BURL
$22.6B
| $837K | ﹤0.01% |
3,600
-51,300
| -93% | -$12.2M |
|
2958
PUT
FerroAtlántica
GSM
$630M
| $837K | ﹤0.01% |
228,300
+196,800
| +625% | +$723K |
|
|
MAG
2959
DELISTED
MAG Silver
MAG
| $836K | ﹤0.01% |
+39,597
| New | +$704K |
|
|
DENT
2960
PUT
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $836K | ﹤0.01% |
340,500
-8,000
| -2% | -$19.6K |
|
2961
CALL
Copa Holdings
CPA
$5.69B
| $835K | ﹤0.01% |
7,600
-2,000
| -21% | -$197K |
|
2962
CALL
Lear
LEA
$7.26B
| $835K | ﹤0.01% |
8,800
-7,300
| -45% | -$642K |
|
2963
PUT
Matsons
MATX
$6.31B
| $835K | ﹤0.01% |
7,500
+6,600
| +733% | +$722K |
|
2964
PUT
Pagaya Technologies
PGY
$1.44B
| $835K | ﹤0.01% |
39,200
+10,900
| +39% | +$155K |
|
2965
PUT
Helmerich & Payne
HP
$3.49B
| $833K | ﹤0.01% |
55,000
+38,900
| +242% | +$713K |
|
2966
CALL
LifeMD
LFMD
$186M
| $833K | ﹤0.01% |
61,200
+28,200
| +85% | +$266K |
|
2967
Crocs
CROX
$6.68B
| $832K | ﹤0.01% |
8,218
-8,235
| -50% | -$840K |
|
2968
CALL
CytomX Therapeutics
CTMX
$745M
| $832K | ﹤0.01% |
366,800
+365,200
| +22,825% | +$589K |
|
2969
CALL
Surgery Partners
SGRY
$2.03B
| $831K | ﹤0.01% |
37,400
-58,300
| -61% | -$1.3M |
|
|
LNW
2970
DELISTED
Light & Wonder
LNW
| $830K | ﹤0.01% |
8,631
+6,944
| +412% | +$595K |
|
2971
CALL
Healthpeak Properties
DOC
$15.3B
| $829K | ﹤0.01% |
47,400
+46,700
| +6,671% | +$829K |
|
|
DQ
2972
CALL
Daqo New Energy
DQ
$805M
| $829K | ﹤0.01% |
54,700
-6,200
| -10% | -$88.1K |
|
2973
Biogen
BIIB
$30B
| $828K | ﹤0.01% |
6,599
+3,440
| +109% | +$429K |
|
|
2974
Pfizer
PFE
$140B
| $828K | ﹤0.01% |
34,183
-1,582,619
| -98% | -$36.9M |
|
2975
PUT
ImmunityBio
IBRX
$7.67B
| $827K | ﹤0.01% |
335,800
-500
| -0.1% | -$1.34K |
|
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.