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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 | |
|---|---|---|---|---|---|---|---|
5326
Chefs' Warehouse
CHEF
$4.51B
| $119K | ﹤0.01% |
1,237
+1,109
| +866% | +$85.9K |
2026 Q1
1 quarter
|
|
5327
Filana Therapeutics
FLNA
$30.5M
| $119K | ﹤0.01% |
99,879
-40,116
| -29% | -$57.2K |
2024 Q4
6 quarters
|
|
5328
PUT
United Natural Foods
UNFI
$2.76B
| $119K | ﹤0.01% |
2,600
-1,100
| -30% | -$54.5K |
2021 Q2
20 quarters
|
|
5329
CALL
Old Republic International
ORI
$9.35B
| $119K | ﹤0.01% |
2,900
+1,400
| +93% | +$55.5K |
2021 Q2
20 quarters
|
|
5330
American Outdoor Brands
AOUT
$228M
| $119K | ﹤0.01% |
10,107
+8,720
| +629% | +$84.8K |
2025 Q3
3 quarters
|
|
5331
NovaGold Resources
NG
$2.58B
| $119K | ﹤0.01% |
19,866
-39,416
| -66% | -$328K |
2025 Q4
2 quarters
|
|
5332
Direxion Daily Healthcare Bull 3X ETF
CURE
$205M
| $119K | ﹤0.01% |
1,057
+932
| +746% | +$87.7K |
2025 Q2
4 quarters
|
|
5333
CALL
Platinum Group Metals
PLG
$134M
| $118K | ﹤0.01% |
87,600
-109,800
| -56% | -$184K |
2025 Q3
3 quarters
|
|
5334
CALL
Hamilton Lane
HLNE
$4.68B
| $118K | ﹤0.01% |
+1,500
| New | +$133K |
2026 Q2
0 quarters
|
|
5335
CALL
Progyny
PGNY
$2.2B
| $118K | ﹤0.01% |
4,100
+3,500
| +583% | +$78.2K |
2020 Q1
25 quarters
|
|
5336
Molina Healthcare
MOH
$10.4B
| $118K | ﹤0.01% |
516
-11,097
| -96% | -$2.01M |
2025 Q4
2 quarters
|
|
5337
Nordic American Tanker
NAT
$1.69B
| $118K | ﹤0.01% |
21,260
-16,856
| -44% | -$95.4K |
2026 Q1
1 quarter
|
|
5338
Sixth Street Specialty
TSLX
$1.68B
| $118K | ﹤0.01% |
6,853
+263
| +4% | +$4.69K |
2026 Q1
1 quarter
|
|
5339
PUT
BioAge Labs
BIOA
$268M
| $118K | ﹤0.01% |
4,800
-300
| -6% | -$5.42K |
2025 Q1
5 quarters
|
|
5340
CALL
Meritage Homes
MTH
$4.1B
| $117K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$88.8K |
2014 Q4
46 quarters
|
|
5341
Tuttle Capital Pure Play Photonics ETF
FOTO
$101M
| $117K | ﹤0.01% |
+4,985
| New | +$120K |
2026 Q2
0 quarters
|
|
5342
CALL
EnerSys
ENS
$5.87B
| $117K | ﹤0.01% |
500
-4,900
| -91% | -$1.06M |
2025 Q1
5 quarters
|
|
|
5343
PUT
EnerSys
ENS
$5.87B
| $117K | ﹤0.01% |
500
-200
| -29% | -$43.4K |
2025 Q4
2 quarters
|
|
5344
PUT
Kodiak Sciences
KOD
$6.16B
| $117K | ﹤0.01% |
3,000
-2,600
| -46% | -$101K |
2025 Q3
3 quarters
|
|
5345
Matsons
MATX
$6.68B
| $117K | ﹤0.01% |
608
+12
| +2% | +$2.19K |
2026 Q1
1 quarter
|
|
5346
PUT
Seanergy Maritime Holdings
SHIP
$342M
| $117K | ﹤0.01% |
8,700
-22,300
| -72% | -$336K |
2026 Q1
1 quarter
|
|
5347
PUT
WEC Energy
WEC
$37.8B
| $117K | ﹤0.01% |
1,000
-3,100
| -76% | -$354K |
2018 Q1
33 quarters
|
|
5348
CALL
Caribou Biosciences
CRBU
$46.5M
| $117K | ﹤0.01% |
66,300
+34,900
| +111% | +$69K |
2024 Q3
7 quarters
|
|
5349
PUT
CytomX Therapeutics
CTMX
$488M
| $117K | ﹤0.01% |
31,100
-280,800
| -90% | -$1.07M |
2025 Q2
4 quarters
|
|
5350
Paysafe
PSFE
$289M
| $116K | ﹤0.01% |
15,589
+13,578
| +675% | +$106K |
2024 Q4
6 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.