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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
651
CALL
AeroVironment
AVAV
$7.73B
| $12.4M | 0.01% |
75,100
+25,700
| +52% | +$4.6M |
|
652
CALL
SoundHound AI
SOUN
$2.69B
| $12.3M | 0.01% |
1,906,200
+831,200
| +77% | +$6.44M |
|
653
PUT
Danaher
DHR
$158B
| $12.3M | 0.01% |
64,600
+22,900
| +55% | +$4.16M |
|
654
PUT
Ross Stores
ROST
$75.4B
| $12.3M | 0.01% |
57,600
+45,200
| +365% | +$10.2M |
|
655
PUT
Capital One
COF
$123B
| $12.2M | 0.01% |
61,000
-7,700
| -11% | -$1.47M |
|
656
CALL
Live Nation Entertainment
LYV
$39.8B
| $12.2M | 0.01% |
66,400
-49,100
| -43% | -$8.08M |
|
|
SGI
657
CALL
Somnigroup International
SGI
$13.5B
| $12.2M | 0.01% |
155,000
+132,900
| +601% | +$9.74M |
|
658
PUT
Trade Desk
TTD
$5.96B
| $12.1M | 0.01% |
669,900
-15,100
| -2% | -$321K |
|
659
CALL
Comfort Systems
FIX
$58.4B
| $12.1M | 0.01% |
6,100
+2,000
| +49% | +$3.63M |
|
660
CALL
Jabil
JBL
$33.2B
| $12.1M | 0.01% |
31,300
-13,900
| -31% | -$4.8M |
|
661
CALL
AstraZeneca
AZN
$258B
| $12M | 0.01% |
63,500
+4,800
| +8% | +$903K |
|
662
Booking.com
BKNG
$123B
| $12M | 0.01% |
67,550
-15,950
| -19% | -$2.72M |
|
663
PUT
BP
BP
$114B
| $12M | 0.01% |
324,600
-70,100
| -18% | -$3.08M |
|
|
SHNY
664
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $12M | 0.01% |
350,600
-93,000
| -21% | -$3.18M |
|
665
PUT
Flex
FLEX
$42.4B
| $12M | 0.01% |
73,800
-7,700
| -9% | -$934K |
|
666
CALL
CSX Corp
CSX
$86.7B
| $11.9M | 0.01% |
250,000
+58,900
| +31% | +$2.66M |
|
667
PUT
Wayfair
W
$13.4B
| $11.8M | 0.01% |
128,200
-22,100
| -15% | -$1.63M |
|
668
CALL
Zeta Global
ZETA
$7.39B
| $11.8M | 0.01% |
600,900
-10,500
| -2% | -$195K |
|
669
PUT
Comcast
CMCSA
$77.8B
| $11.8M | 0.01% |
481,400
+145,000
| +43% | +$3.74M |
|
670
PUT
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$4.81B
| $11.8M | 0.01% |
182,800
+159,900
| +698% | +$10.6M |
|
671
PUT
Viasat
VSAT
$10.1B
| $11.7M | 0.01% |
130,500
+75,100
| +136% | +$4.97M |
|
672
CALL
The Kraft Heinz Company
KHC
$28B
| $11.7M | 0.01% |
495,400
-274,000
| -36% | -$6.32M |
|
673
CALL
UiPath
PATH
$6.49B
| $11.7M | 0.01% |
1,075,800
-175,600
| -14% | -$1.87M |
|
674
CALL
Teva Pharmaceutical Industries Limited
TEVA
$45.7B
| $11.7M | 0.01% |
344,900
-298,100
| -46% | -$9.93M |
|
675
PUT
British American Tobacco
BTI
$120B
| $11.6M | 0.01% |
187,300
-4,600
| -2% | -$278K |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.