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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
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
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
2726
AT&T
T
$150B
| $995K | ﹤0.01% |
+40,799
| New | +$984K |
2026 Q3
0 quarters
|
|
2727
PUT
T-REX 2X Long GME Daily Target ETF
GMEU
$28.4M
| $995K | ﹤0.01% |
+51,700
| New | +$360K |
2026 Q3
0 quarters
|
|
2728
CALL
Newell Brands
NWL
$2.5B
| $995K | ﹤0.01% |
188,400
+35,600
| +23% | +$203K |
2021 Q2
21 quarters
|
|
2729
Benchmark Electronics
BHE
$2.32B
| $994K | ﹤0.01% |
11,994
-16,846
| -58% | -$1.33M |
2026 Q2
1 quarter
|
|
2730
CALL
Elanco Animal Health
ELAN
$13.2B
| $994K | ﹤0.01% |
44,400
+3,900
| +10% | +$94.2K |
2020 Q1
26 quarters
|
|
2731
CALL
Neighborhood Intelligence Inc
NXH
$150M
| $993K | ﹤0.01% |
341,100
+275,900
| +423% | +$1.21M |
2021 Q1
22 quarters
|
|
2732
PUT
ProShares Ether Strategy ETF
EETH
$53.4M
| $992K | ﹤0.01% |
60,500
-7,900
| -12% | -$208K |
2024 Q1
10 quarters
|
|
2733
CALL
UGI
UGI
$8.05B
| $992K | ﹤0.01% |
27,800
+23,300
| +518% | +$856K |
2018 Q2
33 quarters
|
|
2734
PUT
Dover
DOV
$28.3B
| $991K | ﹤0.01% |
5,300
-10,900
| -67% | -$2.2M |
2026 Q2
1 quarter
|
|
2735
CALL
Tutor Perini Cor
TPC
$5.33B
| $990K | ﹤0.01% |
12,000
+7,900
| +193% | +$679K |
2016 Q2
41 quarters
|
|
2736
CALL
EXL Service
EXLS
$6.62B
| $990K | ﹤0.01% |
28,800
-2,900
| -9% | -$96.7K |
2026 Q1
2 quarters
|
|
2737
Edwards Lifesciences
EW
$60.8B
| $989K | ﹤0.01% |
+11,456
| New | +$1.02M |
2026 Q3
0 quarters
|
|
2738
Triple Flag Precious Metals
TFPM
$6.45B
| $989K | ﹤0.01% |
32,086
+28,757
| +864% | +$900K |
2025 Q1
6 quarters
|
|
2739
CALL
Pacific Biosciences
PACB
$653M
| $988K | ﹤0.01% |
416,700
-302,900
| -42% | -$428K |
2026 Q1
2 quarters
|
|
2740
CALL
M/I Homes
MHO
$3.25B
| $986K | ﹤0.01% |
7,300
-4,400
| -38% | -$648K |
2022 Q4
15 quarters
|
|
2741
CALL
Packaging Corp of America
PKG
$22.5B
| $986K | ﹤0.01% |
4,300
-6,000
| -58% | -$1.44M |
2015 Q4
43 quarters
|
|
2742
PUT
Viasat
VSAT
$10.5B
| $985K | ﹤0.01% |
14,000
-116,500
| -89% | -$8.74M |
2021 Q2
21 quarters
|
|
2743
CALL
Opera Ltd
OPRA
$1.42B
| $985K | ﹤0.01% |
55,900
+3,500
| +7% | +$66.5K |
2021 Q1
22 quarters
|
|
2744
PUT
Carbon Collective Climate Solutions US Equity ETF
CCSO
$44.1M
| $984K | ﹤0.01% |
80,000
+1,700
| +2% | +$44.8K |
2023 Q2
13 quarters
|
|
2745
PUT
Kymera Therapeutics
KYMR
$11.5B
| $984K | ﹤0.01% |
8,800
+8,000
| +1,000% | +$916K |
2025 Q4
3 quarters
|
|
2746
CALL
Leverage Shares 2X Long IREN Daily ETF
IREG
$4.26M
| $984K | ﹤0.01% |
46,400
+35,600
| +330% | +$307K |
2026 Q1
2 quarters
|
|
2747
CALL
Gold.com Inc
GOLD
$1.08B
| $983K | ﹤0.01% |
23,100
+11,800
| +104% | +$511K |
2021 Q4
19 quarters
|
|
2748
CALL
DELISTED
DigitalBridge
DBRG
| $981K | ﹤0.01% |
61,300
-315,000
| -84% | -$5M |
2021 Q2
21 quarters
|
|
2749
PUT
Genuine Parts
GPC
$17.1B
| $981K | ﹤0.01% |
7,800
+6,300
| +420% | +$820K |
2021 Q1
22 quarters
|
|
2750
CALL
Timken Company
TKR
$7.59B
| $981K | ﹤0.01% |
8,400
+100
| +1% | +$12.8K |
2016 Q1
42 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.