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 | |
|---|---|---|---|---|---|---|
701
PUT
Gilead Sciences
GILD
$187B
| $11M | 0.01% |
87,000
+29,600
| +52% | +$3.9M |
|
702
CALL
Royal Bank of Canada
RY
$280B
| $11M | 0.01% |
53,100
+2,900
| +6% | +$538K |
|
703
CALL
Grab
GRAB
$12.8B
| $11M | 0.01% |
2,909,300
-849,500
| -23% | -$3.09M |
|
704
PUT
MP Materials
MP
$8.7B
| $10.9M | 0.01% |
195,000
-21,400
| -10% | -$1.3M |
|
705
CALL
Natera
NTRA
$59.5B
| $10.9M | 0.01% |
40,200
+21,200
| +112% | +$4.52M |
|
706
PUT
AeroVironment
AVAV
$7.73B
| $10.9M | 0.01% |
66,000
+18,700
| +40% | +$3.35M |
|
707
PUT
Williams Companies
WMB
$84.7B
| $10.9M | 0.01% |
146,300
+128,500
| +722% | +$9.46M |
|
708
T-Mobile US
TMUS
$177B
| $10.9M | 0.01% |
+64,753
| New | +$12.3M |
|
709
PUT
Expedia Group
EXPE
$31.7B
| $10.8M | 0.01% |
42,400
+16,200
| +62% | +$3.85M |
|
710
Moderna
MRNA
$79.4B
| $10.8M | 0.01% |
154,558
-65,015
| -30% | -$3.36M |
|
711
CALL
Norwegian Cruise Line
NCLH
$6.71B
| $10.8M | 0.01% |
511,500
-387,800
| -43% | -$7.24M |
|
712
CALL
Twilio
TWLO
$42.4B
| $10.8M | 0.01% |
52,300
+20,400
| +64% | +$3.62M |
|
|
STUB
713
CALL
StubHub Holdings
STUB
$2.08B
| $10.8M | 0.01% |
837,900
+429,300
| +105% | +$3.79M |
|
714
PUT
Petrobras
PBR
$131B
| $10.8M | 0.01% |
673,300
-252,600
| -27% | -$4.94M |
|
715
CALL
Snap
SNAP
$9.17B
| $10.8M | 0.01% |
2,422,600
-2,449,300
| -50% | -$13.4M |
|
716
PUT
Roblox
RBLX
$33.2B
| $10.7M | 0.01% |
197,200
-63,400
| -24% | -$3.15M |
|
717
CALL
Avis
CAR
$3.83B
| $10.7M | 0.01% |
72,500
+43,700
| +152% | +$9.62M |
|
718
PUT
Public Storage
PSA
$53.8B
| $10.7M | 0.01% |
33,600
+17,100
| +104% | +$5.23M |
|
719
PUT
BHP
BHP
$216B
| $10.7M | 0.01% |
128,100
-134,500
| -51% | -$11.2M |
|
720
CALL
American Electric Power
AEP
$64.4B
| $10.6M | 0.01% |
77,800
-6,600
| -8% | -$869K |
|
721
PUT
Cigna
CI
$71.9B
| $10.6M | 0.01% |
38,500
+4,800
| +14% | +$1.36M |
|
722
CALL
Emerson Electric
EMR
$88.3B
| $10.6M | 0.01% |
74,000
+30,000
| +68% | +$4.22M |
|
723
State Street Utilities Select Sector SPDR ETF
XLU
$20.4B
| $10.6M | 0.01% |
+233,426
| New | +$10.6M |
|
724
CALL
Celsius Holdings
CELH
$7.08B
| $10.6M | 0.01% |
361,100
+118,600
| +49% | +$3.74M |
|
725
Coherent
COHR
$57.9B
| $10.6M | 0.01% |
26,782
+16,338
| +156% | +$5.78M |
|
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.