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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 | |
|---|---|---|---|---|---|---|---|
5226
CALL
Tango Therapeutics
TNGX
$3.8B
| $131K | ﹤0.01% |
4,200
-2,300
| -35% | -$56.9K |
2025 Q2
4 quarters
|
|
5227
Camtek
CAMT
$5.91B
| $131K | ﹤0.01% |
803
-42,410
| -98% | -$7.52M |
2026 Q1
1 quarter
|
|
5228
CALL
Seres Therapeutics
MCRB
$19.6M
| $131K | ﹤0.01% |
16,600
+700
| +4% | +$5.33K |
2020 Q1
25 quarters
|
|
5229
PUT
FIGS
FIGS
$3.58B
| $131K | ﹤0.01% |
12,800
-18,900
| -60% | -$248K |
2021 Q2
20 quarters
|
|
5230
PUT
Porch Group
PRCH
$2.37B
| $131K | ﹤0.01% |
8,700
-1,600
| -16% | -$15.8K |
2023 Q4
10 quarters
|
|
5231
PUT
EVgo
EVGO
$176M
| $130K | ﹤0.01% |
68,300
+9,400
| +16% | +$18.9K |
2021 Q4
18 quarters
|
|
5232
PUT
Beam Therapeutics
BEAM
$2.98B
| $130K | ﹤0.01% |
3,800
-8,800
| -70% | -$266K |
2020 Q4
22 quarters
|
|
5233
PUT
Upwork
UPWK
$1.14B
| $130K | ﹤0.01% |
15,600
+12,200
| +359% | +$115K |
2018 Q4
30 quarters
|
|
5234
DELISTED
GETTY IMAGES HLDGS INC A
GETY
| $130K | ﹤0.01% |
151,607
+144,346
| +1,988% | +$125K |
2025 Q3
3 quarters
|
|
5235
Cedar Fair
FUN
$786M
| $130K | ﹤0.01% |
6,121
-22,814
| -79% | -$466K |
2026 Q1
1 quarter
|
|
5236
Estee Lauder
EL
$39.4B
| $130K | ﹤0.01% |
+1,651
| New | +$133K |
2026 Q2
0 quarters
|
|
5237
CALL
Pentair
PNR
$10.5B
| $130K | ﹤0.01% |
1,700
-400
| -19% | -$31.6K |
2018 Q2
32 quarters
|
|
5238
CALL
Immunocore
IMCR
$1.61B
| $130K | ﹤0.01% |
4,100
-5,300
| -56% | -$157K |
2022 Q1
17 quarters
|
|
5239
Lifecore Biomedical
LFCR
$247M
| $130K | ﹤0.01% |
24,789
+18,512
| +295% | +$93.3K |
2025 Q3
3 quarters
|
|
5240
CALL
Eversource Energy
ES
$25.6B
| $130K | ﹤0.01% |
1,800
-800
| -31% | -$55.4K |
2018 Q2
32 quarters
|
|
5241
CALL
New Mountain Finance
NMFC
$665M
| $130K | ﹤0.01% |
18,100
+1,800
| +11% | +$14.3K |
2026 Q1
1 quarter
|
|
5242
CALL
ProKidney
PROK
$307M
| $130K | ﹤0.01% |
63,600
+61,600
| +3,080% | +$113K |
2025 Q3
3 quarters
|
|
5243
NET Power
NPWR
$74M
| $130K | ﹤0.01% |
+77,604
| New | +$141K |
2026 Q2
0 quarters
|
|
5244
PUT
Companhia Siderúrgica Nacional
SID
$1.03B
| $130K | ﹤0.01% |
141,600
+96,900
| +217% | +$121K |
2026 Q1
1 quarter
|
|
5245
CALL
Microvast
MVST
$240M
| $129K | ﹤0.01% |
110,500
-149,100
| -57% | -$230K |
2021 Q4
18 quarters
|
|
5246
PUT
Zai Lab
ZLAB
$2.78B
| $129K | ﹤0.01% |
6,800
+1,700
| +33% | +$33.6K |
2021 Q1
21 quarters
|
|
5247
Columbus McKinnon
CMCO
$440M
| $129K | ﹤0.01% |
8,506
+4,668
| +122% | +$69.5K |
2025 Q1
5 quarters
|
|
5248
Philips
PHG
$26.5B
| $128K | ﹤0.01% |
+4,716
| New | +$125K |
2026 Q2
0 quarters
|
|
|
SA
5249
PUT
Seabridge Gold
SA
$2.78B
| $128K | ﹤0.01% |
29,700
+11,200
| +61% | +$337K |
2015 Q3
43 quarters
|
|
5250
PUT
Aimco
AIV
$238M
| $128K | ﹤0.01% |
43,100
+1,100
| +3% | +$4.22K |
2025 Q2
4 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.