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 | |
|---|---|---|---|---|---|---|---|
2501
Astera Labs
ALAB
$40.4B
| $1.22M | ﹤0.01% |
3,440
-6,566
| -66% | -$2.11M |
2026 Q1
2 quarters
|
|
2502
CALL
POSCO
PKX
$15.4B
| $1.22M | ﹤0.01% |
21,700
-3,700
| -15% | -$208K |
2017 Q2
37 quarters
|
|
2503
Bitdeer Technologies
BTDR
$1.94B
| $1.22M | ﹤0.01% |
116,557
+83,675
| +254% | +$953K |
2026 Q1
2 quarters
|
|
2504
PUT
Tetra Tech
TTEK
$9.6B
| $1.22M | ﹤0.01% |
37,100
-36,200
| -49% | -$1.24M |
2025 Q1
6 quarters
|
|
2505
Hawaiian Electric Industries
HE
$1.54B
| $1.22M | ﹤0.01% |
136,647
+73,939
| +118% | +$871K |
2024 Q3
8 quarters
|
|
2506
Riot Platforms
RIOT
$6.86B
| $1.22M | ﹤0.01% |
+60,609
| New | +$1.28M |
2026 Q3
0 quarters
|
|
2507
iShares US Aerospace & Defense ETF
ITA
$12.5B
| $1.22M | ﹤0.01% |
17,676
+6,405
| +57% | +$498K |
2026 Q2
1 quarter
|
|
2508
KKR & Co
KKR
$89.3B
| $1.22M | ﹤0.01% |
13,367
-39,618
| -75% | -$4.04M |
2026 Q1
2 quarters
|
|
2509
PUT
Parsons
PSN
$5.34B
| $1.22M | ﹤0.01% |
29,700
+24,400
| +460% | +$1.2M |
2023 Q3
12 quarters
|
|
2510
CALL
Dover
DOV
$28.3B
| $1.22M | ﹤0.01% |
6,500
-14,700
| -69% | -$2.96M |
2016 Q1
42 quarters
|
|
2511
PUT
Antero Midstream
AM
$9.46B
| $1.22M | ﹤0.01% |
60,300
+7,100
| +13% | +$156K |
2019 Q1
30 quarters
|
|
2512
PUT
Franco-Nevada
FNV
$48B
| $1.21M | ﹤0.01% |
5,100
-4,200
| -45% | -$999K |
2021 Q2
21 quarters
|
|
2513
Tractor Supply
TSCO
$19.1B
| $1.21M | ﹤0.01% |
38,804
-32,141
| -45% | -$1.05M |
2026 Q1
2 quarters
|
|
2514
PUT
Figure Technology Solutions
FIGR
$5.43B
| $1.21M | ﹤0.01% |
42,000
+10,000
| +31% | +$325K |
2025 Q3
4 quarters
|
|
2515
PUT
Boyd Gaming
BYD
$5.48B
| $1.21M | ﹤0.01% |
18,200
-100
| -0.5% | -$8.14K |
2021 Q2
21 quarters
|
|
2516
NexGen Energy
NXE
$5.72B
| $1.21M | ﹤0.01% |
132,805
+50,338
| +61% | +$494K |
2026 Q2
1 quarter
|
|
2517
CALL
Northrop Grumman
NOC
$78.3B
| $1.21M | ﹤0.01% |
2,500
-200
| -7% | -$108K |
2014 Q4
47 quarters
|
|
2518
CALL
Emcor
EME
$29.2B
| $1.21M | ﹤0.01% |
1,600
+100
| +7% | +$77.1K |
2022 Q3
16 quarters
|
|
2519
PUT
Qnity Electronics Inc
Q
$26.5B
| $1.21M | ﹤0.01% |
9,600
-13,900
| -59% | -$1.82M |
2025 Q4
3 quarters
|
|
2520
CALL
Silvercorp Metals
SVM
$2.04B
| $1.21M | ﹤0.01% |
113,000
-70,200
| -38% | -$777K |
2020 Q4
23 quarters
|
|
2521
CALL
Corsair Gaming
CRSR
$1.39B
| $1.21M | ﹤0.01% |
89,300
-49,100
| -35% | -$569K |
2020 Q4
23 quarters
|
|
2522
PUT
Hyatt Hotels
H
$17.8B
| $1.21M | ﹤0.01% |
7,600
+6,400
| +533% | +$1.12M |
2019 Q1
30 quarters
|
|
2523
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $1.2M | ﹤0.01% |
40,500
+21,100
| +109% | +$628K |
2015 Q2
45 quarters
|
|
2524
CALL
Mirion Technologies
MIR
$4.35B
| $1.2M | ﹤0.01% |
85,300
-157,300
| -65% | -$2.49M |
2021 Q1
22 quarters
|
|
2525
Sweetgreen
SG
$1.54B
| $1.2M | ﹤0.01% |
135,511
-73,662
| -35% | -$509K |
2025 Q1
6 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.