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Simplex Trading Portfolio holdings
AUM
$171B
Turnover
30.09%
1-Year Est. Return
85%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
(+14%)
Cap. Flow
-$29.5M
Cap. Flow % of AUM
Cap. Flow %
-0.02%
Top 10 Holdings %
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held
Equity + Options
2.9
years
Top 10 Avg Time Held
Equity + Options
3.8
years
Top 20 Avg Time Held
Equity + Options
4.1
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.3
years
Top 20 Avg Time Held Equity only
0.3
years
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 | |
|---|---|---|---|---|---|---|---|
5476
CALL
Anixa Biosciences
ANIX
$115M
| $105K | ﹤0.01% |
37,600
+16,700
| +80% | +$46.4K |
2024 Q4
6 quarters
|
|
5477
PUT
Life360
LIF
$3.71B
| $105K | ﹤0.01% |
1,900
+1,000
| +111% | +$44.5K |
2025 Q2
4 quarters
|
|
5478
PUT
Achieve Life Sciences
ACHV
$741M
| $105K | ﹤0.01% |
16,100
+9,200
| +133% | +$43.9K |
2025 Q2
4 quarters
|
|
5479
Opus Genetics
IRD
$304M
| $105K | ﹤0.01% |
25,553
-56,927
| -69% | -$266K |
2025 Q3
3 quarters
|
|
5480
PUT
Vishay Precision Group
VPG
$788M
| $105K | ﹤0.01% |
+700
| New | +$65K |
2026 Q2
0 quarters
|
|
5481
PUT
Edgewell Personal Care
EPC
$1.32B
| $105K | ﹤0.01% |
3,900
-1,200
| -24% | -$25.6K |
2025 Q3
3 quarters
|
|
5482
PUT
Treace Medical Concepts
TMCI
$329M
| $105K | ﹤0.01% |
+26,300
| New | +$72.3K |
2026 Q2
0 quarters
|
|
5483
Knight Transportation
KNX
$10B
| $104K | ﹤0.01% |
1,341
-19,763
| -94% | -$1.37M |
2026 Q1
1 quarter
|
|
5484
LexinFintech Holdings
LX
$106M
| $104K | ﹤0.01% |
52,983
-38,510
| -42% | -$82K |
2026 Q1
1 quarter
|
|
5485
XPEL
XPEL
$1.26B
| $104K | ﹤0.01% |
+2,102
| New | +$95.7K |
2026 Q2
0 quarters
|
|
5486
CALL
Similarweb
SMWB
$792M
| $104K | ﹤0.01% |
17,000
+16,900
| +16,900% | +$61.5K |
2026 Q1
1 quarter
|
|
5487
CALL
Sprout Social
SPT
$740M
| $104K | ﹤0.01% |
13,800
+6,600
| +92% | +$42.9K |
2020 Q3
23 quarters
|
|
5488
PUT
Arbutus Biopharma
ABUS
$848M
| $104K | ﹤0.01% |
21,700
-25,900
| -54% | -$114K |
2021 Q2
20 quarters
|
|
5489
CALL
Solid Power
SLDP
$463M
| $104K | ﹤0.01% |
40,200
-134,400
| -77% | -$415K |
2021 Q4
18 quarters
|
|
5490
PUT
Universal Health Services
UHS
$10.4B
| $104K | ﹤0.01% |
700
-1,900
| -73% | -$309K |
2014 Q4
46 quarters
|
|
5491
CALL
Fulton Financial
FULT
$4.52B
| $104K | ﹤0.01% |
+4,300
| New | +$94.3K |
2026 Q2
0 quarters
|
|
5492
ProShares Ultra SpaceX
SPCF
$69.6M
| $104K | ﹤0.01% |
+4,054
| New | +$108K |
2026 Q2
0 quarters
|
|
5493
DELISTED
ACV Auctions
ACVA
| $104K | ﹤0.01% |
14,450
+11,645
| +415% | +$66K |
2025 Q3
3 quarters
|
|
5494
CALL
Badger Meter
BMI
$4.34B
| $104K | ﹤0.01% |
+700
| New | +$91.6K |
2026 Q2
0 quarters
|
|
5495
CALL
Reservoir Media
RSVR
$632M
| $104K | ﹤0.01% |
10,500
-83,800
| -89% | -$847K |
2025 Q3
3 quarters
|
|
5496
Mission Produce
AVO
$1.02B
| $104K | ﹤0.01% |
8,805
-10,775
| -55% | -$136K |
2025 Q3
3 quarters
|
|
5497
Enova International
ENVA
$4.43B
| $104K | ﹤0.01% |
431
-1,587
| -79% | -$273K |
2025 Q2
4 quarters
|
|
5498
CALL
Baldwin Insurance Group
BWIN
$4.48B
| $104K | ﹤0.01% |
3,900
+3,600
| +1,200% | +$77.8K |
2026 Q1
1 quarter
|
|
5499
PUT
WESCO International
WCC
$17.9B
| $104K | ﹤0.01% |
300
+200
| +200% | +$67.9K |
2018 Q2
32 quarters
|
|
5500
GraniteShares 2x Long QCOM Daily ETF
QCML
$57.7M
| $104K | ﹤0.01% |
+5,218
| New | +$121K |
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.