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 | |
|---|---|---|---|---|---|---|
4701
PUT
MSC Industrial Direct
MSM
$6.96B
| $202K | ﹤0.01% |
1,700
+500
| +42% | +$53.1K |
|
4702
Microvast
MVST
$249M
| $202K | ﹤0.01% |
172,796
+91,143
| +112% | +$140K |
|
4703
Vera Therapeutics
VERA
$2.33B
| $202K | ﹤0.01% |
4,707
+4,516
| +2,364% | +$168K |
|
4704
iShares US Technology ETF
IYW
$26.4B
| $202K | ﹤0.01% |
800
-1,638
| -67% | -$376K |
|
|
LX
4705
CALL
LexinFintech Holdings
LX
$121M
| $202K | ﹤0.01% |
102,400
+5,100
| +5% | +$10.9K |
|
4706
Post Holdings
POST
$3.33B
| $202K | ﹤0.01% |
+2,285
| New | +$223K |
|
4707
Old Dominion Freight Line
ODFL
$36.8B
| $202K | ﹤0.01% |
931
-12,907
| -93% | -$2.79M |
|
4708
PUT
United Bankshares
UBSI
$6.28B
| $202K | ﹤0.01% |
4,400
+100
| +2% | +$4.37K |
|
4709
CALL
Innoviz Technologies
INVZ
$112M
| $201K | ﹤0.01% |
264,600
+123,600
| +88% | +$84.6K |
|
|
CHYM
4710
Chime Financial
CHYM
$10B
| $201K | ﹤0.01% |
+9,822
| New | +$191K |
|
4711
Amplify Energy
AMPY
$172M
| $201K | ﹤0.01% |
50,475
-64,327
| -56% | -$330K |
|
4712
CALL
4D Molecular Therapeutics
FDMT
$800M
| $201K | ﹤0.01% |
15,100
+15,000
| +15,000% | +$146K |
|
4713
CALL
St. Joe Company
JOE
$3.76B
| $200K | ﹤0.01% |
3,200
-300
| -9% | -$19.7K |
|
4714
PUT
Prime Medicine
PRME
$560M
| $200K | ﹤0.01% |
54,300
-21,900
| -29% | -$72.7K |
|
4715
PUT
Corpay
CPAY
$25.8B
| $200K | ﹤0.01% |
+600
| New | +$199K |
|
|
AVR
4716
Anteris Technologies
AVR
$740M
| $200K | ﹤0.01% |
20,269
+18,828
| +1,307% | +$143K |
|
|
OFRM
4717
Once Upon a Farm PBC
OFRM
$664M
| $200K | ﹤0.01% |
9,747
+1,172
| +14% | +$19.2K |
|
4718
Direxion Daily S&P Oil & Gas Exp. & Prod. Bear 2X ETF
DRIP
$135M
| $200K | ﹤0.01% |
3,729
+782
| +27% | +$37K |
|
4719
Ternium
TX
$10.5B
| $199K | ﹤0.01% |
4,671
-119
| -2% | -$5.36K |
|
4720
CALL
Regency Centers
REG
$13.3B
| $199K | ﹤0.01% |
2,500
+2,400
| +2,400% | +$189K |
|
4721
CALL
Kaspi.kz JSC
KSPI
$18.2B
| $199K | ﹤0.01% |
2,300
-3,700
| -62% | -$314K |
|
4722
CALL
Mission Produce
AVO
$1.15B
| $199K | ﹤0.01% |
16,900
+4,900
| +41% | +$61.9K |
|
4723
CALL
Inhibrx
INBX
$1.54B
| $199K | ﹤0.01% |
2,100
+400
| +24% | +$40.1K |
|
4724
PUT
Synaptics
SYNA
$4B
| $199K | ﹤0.01% |
1,600
-14,300
| -90% | -$1.61M |
|
4725
Grand Canyon Education
LOPE
$3.85B
| $198K | ﹤0.01% |
1,387
+1,368
| +7,200% | +$217K |
|
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.