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 | Held Since | |
|---|---|---|---|---|---|---|---|
7751
PUT
OFS Capital
OFS
$52.3M
| $9.2K | ﹤0.01% |
2,600
| – | – |
2026 Q1
1 quarter
|
|
7752
ACI Worldwide
ACIW
$5.59B
| $9.2K | ﹤0.01% |
183
-89
| -33% | -$3.87K |
2025 Q3
3 quarters
|
|
7753
CALL
iMGP DBi Managed Futures Strategy ETF
DBMF
$4.38B
| $9.18K | ﹤0.01% |
300
+200
| +200% | +$6.14K |
2026 Q1
1 quarter
|
|
|
7754
PUT
iMGP DBi Managed Futures Strategy ETF
DBMF
$4.38B
| $9.18K | ﹤0.01% |
300
+100
| +50% | +$3.07K |
2025 Q3
3 quarters
|
|
7755
PUT
Revolve Group
RVLV
$1.58B
| $9.16K | ﹤0.01% |
400
-46,200
| -99% | -$1.02M |
2019 Q2
28 quarters
|
|
7756
PUT
DELISTED
Simulations Plus
SLP
| $9.16K | ﹤0.01% |
500
| – | – |
2026 Q1
1 quarter
|
|
7757
PUT
Myriad Genetics
MYGN
$548M
| $9.14K | ﹤0.01% |
1,600
+200
| +14% | +$908 |
2026 Q1
1 quarter
|
|
|
SILA
7758
CALL
DELISTED
Sila Realty Trust
SILA
| $9.11K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
7759
PUT
BTCS Inc
BTCS
$57.7M
| $9.1K | ﹤0.01% |
8,200
-2,200
| -21% | -$3.54K |
2025 Q3
3 quarters
|
|
7760
PUT
UMH Properties
UMH
$1.31B
| $9.08K | ﹤0.01% |
600
+200
| +50% | +$3.06K |
2023 Q3
11 quarters
|
|
7761
Renasant Corp
RNST
$3.79B
| $9.06K | ﹤0.01% |
+213
| New | +$8.61K |
2026 Q2
0 quarters
|
|
7762
PUT
1-800-Flowers.com
FLWS
$174M
| $9.05K | ﹤0.01% |
2,600
+900
| +53% | +$3.55K |
2018 Q3
31 quarters
|
|
7763
CALL
Republic Bancorp
RBCAA
$1.78B
| $9.04K | ﹤0.01% |
+100
| New | +$7.92K |
2026 Q2
0 quarters
|
|
7764
PUT
HealthEquity
HQY
$8.57B
| $9.03K | ﹤0.01% |
100
-500
| -83% | -$42.4K |
2017 Q4
34 quarters
|
|
7765
FreightCar America
RAIL
$141M
| $9.03K | ﹤0.01% |
927
-21,091
| -96% | -$178K |
2025 Q2
4 quarters
|
|
7766
PUT
Blink Charging
BLNK
$57.3M
| $9.02K | ﹤0.01% |
14,100
+1,700
| +14% | +$1.23K |
2018 Q2
32 quarters
|
|
7767
iShares MSCI Brazil Small-Cap ETF
EWZS
$416M
| $9.02K | ﹤0.01% |
695
-2,365
| -77% | -$34K |
2025 Q3
3 quarters
|
|
7768
CALL
Huron Consulting
HURN
$3.15B
| $9.02K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
7769
iShares ESG Aware MSCI USA ETF
ESGU
$17.9B
| $9K | ﹤0.01% |
+55
| New | +$8.7K |
2026 Q2
0 quarters
|
|
7770
PUT
Otter Tail
OTTR
$3.78B
| $9K | ﹤0.01% |
100
-200
| -67% | -$17.7K |
2025 Q3
3 quarters
|
|
7771
CALL
Betterware México
BWMX
$587M
| $8.99K | ﹤0.01% |
+500
| New | +$8.76K |
2026 Q2
0 quarters
|
|
7772
Quantum eMotion
QNC
$248M
| $8.99K | ﹤0.01% |
+2,882
| New | +$8.37K |
2026 Q2
0 quarters
|
|
7773
CALL
Artivion
AORT
$1.15B
| $8.99K | ﹤0.01% |
400
+100
| +33% | +$2.8K |
2021 Q2
20 quarters
|
|
7774
CALL
Patrick Industries
PATK
$2.16B
| $8.98K | ﹤0.01% |
100
-4,600
| -98% | -$439K |
2026 Q1
1 quarter
|
|
7775
PUT
StandardAero Inc
SARO
$7.13B
| $8.97K | ﹤0.01% |
+300
| New | +$7.89K |
2026 Q2
0 quarters
|
|
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.