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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 | |
|---|---|---|---|---|---|---|---|
5526
Rapid7
RPD
$1.15B
| $101K | ﹤0.01% |
+12,488
| New | +$82.8K |
2026 Q2
0 quarters
|
|
5527
Aspen Aerogels
ASPN
$447M
| $101K | ﹤0.01% |
15,952
+13,578
| +572% | +$66.6K |
2024 Q1
9 quarters
|
|
5528
CALL
CTO Realty Growth
CTO
$759M
| $101K | ﹤0.01% |
4,700
+700
| +18% | +$14.2K |
2025 Q2
4 quarters
|
|
5529
PUT
TransUnion
TRU
$14.4B
| $101K | ﹤0.01% |
1,400
-12,400
| -90% | -$869K |
2021 Q2
20 quarters
|
|
5530
Optimum Communications Inc
OPTU
$253M
| $101K | ﹤0.01% |
+69,646
| New | +$86.6K |
2026 Q2
0 quarters
|
|
5531
PUT
Enviri
NVRI
$535M
| $101K | ﹤0.01% |
4,600
-8,200
| -64% | -$164K |
2024 Q3
7 quarters
|
|
5532
CALL
CareTrust REIT
CTRE
$8.57B
| $101K | ﹤0.01% |
2,500
-11,400
| -82% | -$448K |
2025 Q1
5 quarters
|
|
5533
Velocity Financial
VEL
$630M
| $101K | ﹤0.01% |
+5,453
| New | +$99.2K |
2026 Q2
0 quarters
|
|
5534
CALL
Unisys
UIS
$194M
| $101K | ﹤0.01% |
27,500
+22,300
| +429% | +$70K |
2024 Q3
7 quarters
|
|
5535
Adecoagro
AGRO
$1.4B
| $100K | ﹤0.01% |
10,493
-48,188
| -82% | -$607K |
2024 Q4
6 quarters
|
|
5536
CALL
Dingdong
DDL
$422M
| $100K | ﹤0.01% |
51,900
-100,300
| -66% | -$249K |
2024 Q4
6 quarters
|
|
5537
PUT
Elicio Therapeutics
ELTX
$47.4M
| $100K | ﹤0.01% |
25,600
+4,000
| +19% | +$40.2K |
2025 Q3
3 quarters
|
|
5538
CALL
Corpay
CPAY
$26.1B
| $100K | ﹤0.01% |
300
+200
| +200% | +$66.4K |
2025 Q1
5 quarters
|
|
5539
Jack in the Box
JACK
$250M
| $100K | ﹤0.01% |
+6,319
| New | +$77.9K |
2026 Q2
0 quarters
|
|
5540
CALL
SouthState Bank Corp
SSB
$10.3B
| $100K | ﹤0.01% |
+1,000
| New | +$96.4K |
2026 Q2
0 quarters
|
|
5541
AvePoint
AVPT
$3.67B
| $100K | ﹤0.01% |
8,902
+3,746
| +73% | +$38.5K |
2025 Q4
2 quarters
|
|
5542
Triple Flag Precious Metals
TFPM
$6.01B
| $100K | ﹤0.01% |
3,329
-8,855
| -73% | -$285K |
2025 Q1
5 quarters
|
|
5543
PUT
Federal Agricultural Mortgage Class A
AGM.A
| $100K | ﹤0.01% |
+500
| New | +$67.5K |
2026 Q2
0 quarters
|
|
5544
Tradr 2X Long NVTS Daily ETF
NVTX
$23.3M
| $100K | ﹤0.01% |
+2,047
| New | +$157K |
2026 Q2
0 quarters
|
|
5545
CALL
TIC Solutions Inc
TIC
$2.27B
| $100K | ﹤0.01% |
12,300
-33,000
| -73% | -$278K |
2025 Q3
3 quarters
|
|
5546
PUT
Mitsubishi UFJ Financial
MUFG
$247B
| $99.4K | ﹤0.01% |
5,000
-100
| -2% | -$1.88K |
2026 Q1
1 quarter
|
|
5547
PUT
DELISTED
Talkspace
TALK
| $99.3K | ﹤0.01% |
19,100
+17,300
| +961% | +$89.8K |
2025 Q4
2 quarters
|
|
|
TWO
5548
CALL
DELISTED
Two Harbors Investment
TWO
| $99.3K | ﹤0.01% |
8,000
+2,600
| +48% | +$31.1K |
2018 Q2
32 quarters
|
|
5549
CALL
Amtech Systems
ASYS
$240M
| $99.2K | ﹤0.01% |
4,300
+3,100
| +258% | +$58.9K |
2025 Q2
4 quarters
|
|
5550
CALL
Largo
LGO
$42.7M
| $99.2K | ﹤0.01% |
156,500
-75,600
| -33% | -$77.9K |
2025 Q3
3 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.