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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 | |
|---|---|---|---|---|---|---|---|
4126
CALL
Assured Guaranty
AGO
$3.24B
| $312K | ﹤0.01% |
4,600
+2,300
| +100% | +$178K |
2014 Q4
47 quarters
|
|
4127
FerroAtlántica
GSM
$562M
| $312K | ﹤0.01% |
78,368
+54,739
| +232% | +$213K |
2025 Q3
4 quarters
|
|
4128
Park-Ohio Holdings
PKOH
$660M
| $311K | ﹤0.01% |
+6,735
| New | +$292K |
2026 Q3
0 quarters
|
|
4129
Shattuck Labs
STTK
$466M
| $311K | ﹤0.01% |
45,601
+40,184
| +742% | +$278K |
2026 Q2
1 quarter
|
|
4130
Methanex
MEOH
$5.39B
| $311K | ﹤0.01% |
5,296
-9,470
| -64% | -$532K |
2026 Q2
1 quarter
|
|
4131
PUT
Fortuna Silver Mines
FSM
$2.7B
| $310K | ﹤0.01% |
27,600
-700
| -2% | -$7.29K |
2018 Q2
33 quarters
|
|
4132
PUT
Acuity Brands
AYI
$9.9B
| $310K | ﹤0.01% |
1,000
+700
| +233% | +$233K |
2026 Q2
1 quarter
|
|
4133
Unum
UNM
$12.3B
| $309K | ﹤0.01% |
3,527
+124
| +4% | +$11.2K |
2026 Q2
1 quarter
|
|
|
HTGCR
4134
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $309K | ﹤0.01% |
18,400
-28,600
| -61% | -$481K |
2018 Q2
33 quarters
|
|
4135
CALL
indie Semiconductor
INDI
$497M
| $309K | ﹤0.01% |
105,600
-109,100
| -51% | -$402K |
2021 Q2
21 quarters
|
|
|
EROC
4136
ERock Inc
EROC
$398M
| $309K | ﹤0.01% |
+25,185
| New | +$314K |
2026 Q3
0 quarters
|
|
4137
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$205M
| $308K | ﹤0.01% |
6,178
+6,079
| +6,140% | +$257K |
2026 Q2
1 quarter
|
|
4138
PUT
Omada Health Inc
OMDA
$890M
| $308K | ﹤0.01% |
14,800
+2,600
| +21% | +$57.5K |
2025 Q4
3 quarters
|
|
4139
CALL
Simplify US Equity PLUS Convexity ETF
SPYC
$67.5M
| $308K | ﹤0.01% |
18,700
-8,600
| -32% | -$397K |
2026 Q1
2 quarters
|
|
4140
CALL
Aurora Cannabis
ACB
$321M
| $308K | ﹤0.01% |
78,900
-37,900
| -32% | -$129K |
2018 Q4
31 quarters
|
|
4141
CALL
Polaris
PII
$3.7B
| $308K | ﹤0.01% |
5,900
+300
| +5% | +$19.4K |
2014 Q4
47 quarters
|
|
4142
PUT
Lineage Inc
LINE
$8B
| $307K | ﹤0.01% |
9,000
-23,800
| -73% | -$967K |
2025 Q1
6 quarters
|
|
4143
CALL
Matthews International
MATW
$591M
| $307K | ﹤0.01% |
+16,000
| New | +$377K |
2026 Q3
0 quarters
|
|
4144
iShares Emerging Markets Dividend ETF
DVYE
$1.11B
| $306K | ﹤0.01% |
+9,007
| New | +$309K |
2026 Q3
0 quarters
|
|
4145
CALL
NBT Bancorp
NBTB
$2.74B
| $306K | ﹤0.01% |
6,100
+1,000
| +20% | +$51.8K |
2026 Q2
1 quarter
|
|
4146
CALL
Cognyte Software
CGNT
$603M
| $306K | ﹤0.01% |
35,200
+23,900
| +212% | +$209K |
2022 Q3
16 quarters
|
|
4147
CALL
BlueLinx
BXC
$498M
| $306K | ﹤0.01% |
4,300
+1,100
| +34% | +$78.9K |
2026 Q1
2 quarters
|
|
4148
CALL
Adamas Trust
ADAM
$470M
| $306K | ﹤0.01% |
39,300
+10,300
| +36% | +$95.3K |
2023 Q1
14 quarters
|
|
4149
Global X MLP & Energy Infrastructure ETF
MLPX
$3.6B
| $305K | ﹤0.01% |
+4,368
| New | +$326K |
2026 Q3
0 quarters
|
|
4150
PUT
Service Corp International
SCI
$10.2B
| $305K | ﹤0.01% |
4,000
+2,600
| +186% | +$211K |
2021 Q2
21 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.