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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 | |
|---|---|---|---|---|---|---|---|
4101
Miami International Holdings
MIAX
$3.73B
| $317K | ﹤0.01% |
9,466
-16,788
| -64% | -$702K |
2025 Q4
3 quarters
|
|
4102
Reliance Steel & Aluminium
RS
$21.8B
| $317K | ﹤0.01% |
824
-22
| -3% | -$8.72K |
2025 Q1
6 quarters
|
|
4103
APA Corp
APA
$16.2B
| $317K | ﹤0.01% |
+7,632
| New | +$303K |
2026 Q3
0 quarters
|
|
4104
PUT
Transportadora de Gas del Sur
TGS
$3.19B
| $317K | ﹤0.01% |
12,200
-13,100
| -52% | -$381K |
2024 Q4
7 quarters
|
|
4105
SEI Investments
SEIC
$13B
| $316K | ﹤0.01% |
+3,083
| New | +$320K |
2026 Q3
0 quarters
|
|
4106
PUT
Golub Capital BDC
GBDC
$3.24B
| $316K | ﹤0.01% |
25,000
-11,500
| -32% | -$148K |
2020 Q1
26 quarters
|
|
4107
PUT
InfraCap MLP ETF
AMZA
$458M
| $316K | ﹤0.01% |
14,800
+2,500
| +20% | +$123K |
2021 Q1
22 quarters
|
|
4108
Nuvectis Pharma
NVCT
$685M
| $315K | ﹤0.01% |
14,932
-16,462
| -52% | -$347K |
2026 Q1
2 quarters
|
|
4109
PUT
GigaCloud Technology
GCT
$2.37B
| $315K | ﹤0.01% |
6,100
+5,300
| +663% | +$246K |
2023 Q4
11 quarters
|
|
4110
Wheaton Precious Metals
WPM
$60.1B
| $315K | ﹤0.01% |
2,357
-22,588
| -91% | -$2.99M |
2026 Q2
1 quarter
|
|
4111
PUT
TXNM Energy Inc
TXNM
$6.47B
| $315K | ﹤0.01% |
5,400
+400
| +8% | +$23.1K |
2025 Q1
6 quarters
|
|
4112
CALL
Sunbelt Rentals Holdings
SUNB
$33.5B
| $315K | ﹤0.01% |
4,300
-1,100
| -20% | -$82K |
2026 Q1
2 quarters
|
|
4113
CALL
EyePoint Inc
EYPT
$27M
| $315K | ﹤0.01% |
96,200
+66,500
| +224% | +$585K |
2018 Q2
33 quarters
|
|
4114
CALL
SGHC Ltd
SGHC
$5.91B
| $314K | ﹤0.01% |
27,700
-295,000
| -91% | -$4.04M |
2024 Q3
8 quarters
|
|
4115
Capital One
COF
$117B
| $314K | ﹤0.01% |
+1,628
| New | +$342K |
2026 Q3
0 quarters
|
|
4116
CALL
Millicom
TIGO
$13.1B
| $314K | ﹤0.01% |
3,600
-13,100
| -78% | -$1.24M |
2025 Q1
6 quarters
|
|
4117
G-III Apparel Group
GIII
$1.35B
| $313K | ﹤0.01% |
11,557
+11,496
| +18,846% | +$373K |
2026 Q1
2 quarters
|
|
4118
PUT
Backblaze
BLZE
$518M
| $313K | ﹤0.01% |
22,400
+13,200
| +143% | +$198K |
2025 Q4
3 quarters
|
|
4119
Tango Therapeutics
TNGX
$4.19B
| $313K | ﹤0.01% |
12,558
+11,656
| +1,292% | +$303K |
2026 Q1
2 quarters
|
|
4120
CALL
Humacyte
HUMA
$155M
| $313K | ﹤0.01% |
604,100
-72,100
| -11% | -$46.1K |
2021 Q4
19 quarters
|
|
4121
CALL
Contineum Therapeutics
CTNM
$379M
| $313K | ﹤0.01% |
23,300
+22,500
| +2,813% | +$335K |
2026 Q2
1 quarter
|
|
4122
PUT
RoboStrategy Inc
BOT
$434M
| $313K | ﹤0.01% |
11,900
+9,800
| +467% | +$283K |
2026 Q2
1 quarter
|
|
4123
MannKind Corp
MNKD
$1.33B
| $312K | ﹤0.01% |
80,123
+19,374
| +32% | +$75.9K |
2025 Q3
4 quarters
|
|
4124
PUT
AEVEX Corp
AVEX
$898M
| $312K | ﹤0.01% |
20,600
+16,200
| +368% | +$281K |
2026 Q2
1 quarter
|
|
4125
CALL
NervGen Pharma
NGEN
$194M
| $312K | ﹤0.01% |
163,100
+4,800
| +3% | +$9.2K |
2026 Q1
2 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.