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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 | |
|---|---|---|---|---|---|---|---|
3076
Lithia Motors
LAD
$6.42B
| $752K | ﹤0.01% |
2,577
-2,437
| -49% | -$849K |
2026 Q1
2 quarters
|
|
3077
Rivian
RIVN
$18.7B
| $751K | ﹤0.01% |
+50,301
| New | +$816K |
2026 Q3
0 quarters
|
|
3078
Ultra Clean Holdings
UCTT
$2.31B
| $751K | ﹤0.01% |
9,263
+558
| +6% | +$46.5K |
2025 Q1
6 quarters
|
|
3079
PUT
Alto Neuroscience
ANRO
$1.23B
| $751K | ﹤0.01% |
29,400
+29,300
| +29,300% | +$880K |
2025 Q3
4 quarters
|
|
3080
Allegro MicroSystems
ALGM
$5.91B
| $750K | ﹤0.01% |
+20,640
| New | +$865K |
2026 Q3
0 quarters
|
|
3081
Perrigo
PRGO
$2.25B
| $749K | ﹤0.01% |
50,778
+26,591
| +110% | +$336K |
2025 Q2
5 quarters
|
|
3082
PUT
Amcor
AMCR
$20.2B
| $749K | ﹤0.01% |
17,900
-2,600
| -13% | -$116K |
2020 Q1
26 quarters
|
|
3083
PUT
Hinge Health
HNGE
$9.8B
| $749K | ﹤0.01% |
7,700
-36,900
| -83% | -$3.23M |
2025 Q2
5 quarters
|
|
3084
GoPro
GPRO
$124M
| $748K | ﹤0.01% |
580,119
+180,031
| +45% | +$163K |
2024 Q1
10 quarters
|
|
3085
Imperial Petroleum
IMPP
$202M
| $748K | ﹤0.01% |
146,425
+23,077
| +19% | +$116K |
2025 Q3
4 quarters
|
|
|
DPC
3086
CALL
DPC Holdings PLC
DPC
$5.13B
| $748K | ﹤0.01% |
+17,700
| New | +$809K |
2026 Q3
0 quarters
|
|
3087
PUT
Planet Fitness
PLNT
$4.47B
| $747K | ﹤0.01% |
17,700
-18,900
| -52% | -$964K |
2017 Q4
35 quarters
|
|
3088
PUT
Core Natural Resources Inc
CNR
$4.16B
| $747K | ﹤0.01% |
8,700
+7,900
| +988% | +$710K |
2019 Q3
28 quarters
|
|
3089
Zimmer Biomet
ZBH
$19.8B
| $747K | ﹤0.01% |
8,407
-3,625
| -30% | -$343K |
2026 Q1
2 quarters
|
|
3090
CALL
TETRA Technologies
TTI
$945M
| $744K | ﹤0.01% |
126,700
+126,100
| +21,017% | +$971K |
2020 Q3
24 quarters
|
|
3091
PUT
PTC
PTC
$21.3B
| $744K | ﹤0.01% |
5,300
+900
| +20% | +$124K |
2016 Q3
40 quarters
|
|
3092
PUT
Rezolve AI
RZLV
$521M
| $741K | ﹤0.01% |
341,600
+272,800
| +397% | +$675K |
2025 Q1
6 quarters
|
|
3093
CALL
Americas Gold and Silver
USAS
$943M
| $740K | ﹤0.01% |
169,800
+79,600
| +88% | +$377K |
2026 Q1
2 quarters
|
|
3094
PUT
ATI
ATI
$25.8B
| $739K | ﹤0.01% |
3,900
-2,300
| -37% | -$459K |
2014 Q4
47 quarters
|
|
3095
PUT
Neighborhood Intelligence Inc
NXH
$139M
| $738K | ﹤0.01% |
423,000
-900
| -0.2% | -$3.94K |
2021 Q1
22 quarters
|
|
3096
CALL
Banc of California
BANC
$2.82B
| $737K | ﹤0.01% |
42,800
+32,500
| +316% | +$628K |
2023 Q4
11 quarters
|
|
3097
Silvercorp Metals
SVM
$1.98B
| $735K | ﹤0.01% |
68,899
-49,379
| -42% | -$547K |
2026 Q2
1 quarter
|
|
3098
CALL
DXC Technology
DXC
$2.31B
| $734K | ﹤0.01% |
67,800
+61,800
| +1,030% | +$657K |
2017 Q2
37 quarters
|
|
3099
PUT
Hudson Pacific Properties
HPP
$478M
| $734K | ﹤0.01% |
63,600
+38,000
| +148% | +$523K |
2018 Q4
31 quarters
|
|
3100
CALL
PagerDuty
PD
$1.24B
| $734K | ﹤0.01% |
48,600
+38,900
| +401% | +$472K |
2019 Q2
29 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.