We are live on !
Find out more
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 | |
|---|---|---|---|---|---|---|---|
4001
CALL
Kyndryl
KD
$3.64B
| $347K | ﹤0.01% |
30,800
-2,700
| -8% | -$34.3K |
2021 Q4
19 quarters
|
|
4002
PUT
Adecoagro
AGRO
$1.29B
| $347K | ﹤0.01% |
34,200
+8,200
| +32% | +$86.3K |
2025 Q4
3 quarters
|
|
4003
Vanguard Morningstar Mega Cap Growth ETF
MGK
$32.2B
| $346K | ﹤0.01% |
3,737
-732
| -16% | -$65.3K |
2026 Q2
1 quarter
|
|
4004
Roundhill Humanoid Robotics ETF
HUMN
$84.1M
| $346K | ﹤0.01% |
11,927
-1,772
| -13% | -$54.8K |
2025 Q3
4 quarters
|
|
4005
iShares TIPS Bond ETF
TIP
$14.4B
| $345K | ﹤0.01% |
3,320
-15,617
| -82% | -$1.67M |
2026 Q1
2 quarters
|
|
4006
CALL
IMAX
IMAX
$2.64B
| $345K | ﹤0.01% |
6,300
-1,900
| -23% | -$92.3K |
2021 Q1
22 quarters
|
|
4007
CALL
Photronics
PLAB
$1.61B
| $345K | ﹤0.01% |
11,200
-1,300
| -10% | -$39K |
2018 Q2
33 quarters
|
|
4008
HawkEye 360 Inc
HAWK
$1.71B
| $345K | ﹤0.01% |
22,825
+13,770
| +152% | +$270K |
2026 Q2
1 quarter
|
|
4009
CALL
Ameriprise Financial
AMP
$44.9B
| $345K | ﹤0.01% |
700
+200
| +40% | +$107K |
2026 Q1
2 quarters
|
|
4010
Versant Media Group
VSNT
$4.91B
| $344K | ﹤0.01% |
10,861
-8,690
| -44% | -$321K |
2026 Q1
2 quarters
|
|
4011
CALL
Hudson Pacific Properties
HPP
$472M
| $344K | ﹤0.01% |
29,800
+14,700
| +97% | +$202K |
2020 Q2
25 quarters
|
|
4012
Ituran Location and Control
ITRN
$952M
| $344K | ﹤0.01% |
6,711
-31,724
| -83% | -$1.7M |
2026 Q1
2 quarters
|
|
4013
PUT
DELISTED
Qorvo
QRVO
| $343K | ﹤0.01% |
3,000
+1,800
| +150% | +$177K |
2021 Q2
21 quarters
|
|
4014
PUT
Aspen Aerogels
ASPN
$456M
| $343K | ﹤0.01% |
62,600
+46,500
| +289% | +$243K |
2020 Q4
23 quarters
|
|
4015
Annexon
ANNX
$742M
| $343K | ﹤0.01% |
+81,084
| New | +$407K |
2026 Q3
0 quarters
|
|
4016
Redwood Trust
RWT
$325M
| $343K | ﹤0.01% |
88,395
+55,290
| +167% | +$250K |
2025 Q4
3 quarters
|
|
4017
CALL
Williams-Sonoma
WSM
$29.6B
| $342K | ﹤0.01% |
1,500
| – | – |
2021 Q2
21 quarters
|
|
4018
CALL
Sagimet Biosciences
SGMT
$719M
| $342K | ﹤0.01% |
34,600
+6,500
| +23% | +$59.7K |
2024 Q4
7 quarters
|
|
4019
PUT
BCE
BCE
$20.1B
| $342K | ﹤0.01% |
16,800
+4,400
| +35% | +$98.3K |
2018 Q1
34 quarters
|
|
4020
CALL
CNA Financial
CNA
$13.2B
| $341K | ﹤0.01% |
7,600
-10,800
| -59% | -$541K |
2025 Q1
6 quarters
|
|
4021
CALL
Disc Medicine
IRON
$3.67B
| $340K | ﹤0.01% |
5,200
-800
| -13% | -$60.5K |
2024 Q4
7 quarters
|
|
4022
First Trust Nasdaq Semiconductor ETF
FTXL
$998M
| $340K | ﹤0.01% |
+1,342
| New | +$315K |
2026 Q3
0 quarters
|
|
4023
DoubleVerify
DV
$2.12B
| $339K | ﹤0.01% |
+25,140
| New | +$316K |
2026 Q3
0 quarters
|
|
4024
Invesco DB Commodity Index Tracking Fund
DBC
$1.82B
| $339K | ﹤0.01% |
+10,480
| New | +$319K |
2026 Q3
0 quarters
|
|
4025
Spire Global
SPIR
$353M
| $338K | ﹤0.01% |
+30,251
| New | +$394K |
2026 Q3
0 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.