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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 | |
|---|---|---|---|---|---|---|---|
3226
CALL
NeoGenomics
NEO
$2.14B
| $659K | ﹤0.01% |
35,900
+24,600
| +218% | +$406K |
2021 Q2
21 quarters
|
|
3227
Blue Owl Capital
OBDC
$5.34B
| $659K | ﹤0.01% |
62,793
+21,702
| +53% | +$241K |
2026 Q1
2 quarters
|
|
3228
Ingredion
INGR
$5.78B
| $658K | ﹤0.01% |
6,865
+5,890
| +604% | +$596K |
2026 Q1
2 quarters
|
|
3229
CALL
Flowers Foods
FLO
$1.27B
| $658K | ﹤0.01% |
118,500
+87,500
| +282% | +$626K |
2016 Q1
42 quarters
|
|
3230
CALL
Ardelyx
ARDX
$784M
| $658K | ﹤0.01% |
192,300
+40,600
| +27% | +$174K |
2019 Q2
29 quarters
|
|
3231
CALL
Helmerich & Payne
HP
$3.71B
| $657K | ﹤0.01% |
17,700
-1,800
| -9% | -$69.7K |
2014 Q4
47 quarters
|
|
3232
CALL
East-West Bancorp
EWBC
$18B
| $657K | ﹤0.01% |
5,300
+4,000
| +308% | +$521K |
2017 Q3
36 quarters
|
|
3233
CALL
Heritage Insurance Holdings
HRTG
$993M
| $656K | ﹤0.01% |
19,800
-9,500
| -32% | -$300K |
2026 Q1
2 quarters
|
|
3234
ProShares UltraShort Gold
GLL
$98.3M
| $656K | ﹤0.01% |
26,328
-167,962
| -86% | -$4.02M |
2025 Q3
4 quarters
|
|
3235
CALL
Primoris Services
PRIM
$3.76B
| $656K | ﹤0.01% |
8,800
-13,400
| -60% | -$1.08M |
2023 Q4
11 quarters
|
|
3236
CALL
AEVEX Corp
AVEX
$952M
| $656K | ﹤0.01% |
43,300
+22,200
| +105% | +$385K |
2026 Q2
1 quarter
|
|
3237
PUT
Nova
NVMI
$10.4B
| $655K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$638K |
2024 Q4
7 quarters
|
|
3238
CALL
Clear Secure
YOU
$5.66B
| $654K | ﹤0.01% |
15,600
+100
| +0.6% | +$4.8K |
2021 Q4
19 quarters
|
|
3239
CALL
Sturm, Ruger & Co
RGR
$790M
| $654K | ﹤0.01% |
15,400
+9,000
| +141% | +$347K |
2014 Q4
47 quarters
|
|
3240
United States Natural Gas Fund
UNG
$643M
| $653K | ﹤0.01% |
+62,950
| New | +$656K |
2026 Q3
0 quarters
|
|
3241
TMC The Metals Company
TMC
$1.01B
| $653K | ﹤0.01% |
169,959
+118,845
| +233% | +$489K |
2024 Q3
8 quarters
|
|
3242
CALL
Agios Pharmaceuticals
AGIO
$1.9B
| $652K | ﹤0.01% |
19,600
-20,300
| -51% | -$710K |
2017 Q4
35 quarters
|
|
3243
CALL
GeneDx Holdings
WGS
$1.55B
| $651K | ﹤0.01% |
9,000
+6,600
| +275% | +$511K |
2023 Q1
14 quarters
|
|
3244
CALL
CorMedix
CRMD
$385M
| $651K | ﹤0.01% |
84,500
-70,800
| -46% | -$567K |
2018 Q3
32 quarters
|
|
3245
PUT
United Therapeutics
UTHR
$25.3B
| $650K | ﹤0.01% |
1,200
+300
| +33% | +$155K |
2026 Q1
2 quarters
|
|
3246
Global X Artificial Intelligence & Technology ETF
AIQ
$9.6B
| $650K | ﹤0.01% |
9,978
+6,669
| +202% | +$418K |
2025 Q4
3 quarters
|
|
3247
PUT
Charles River Laboratories
CRL
$16.3B
| $649K | ﹤0.01% |
2,200
+200
| +10% | +$52.7K |
2017 Q3
36 quarters
|
|
3248
CALL
Kimbell Royalty Partners
KRP
$1.63B
| $648K | ﹤0.01% |
45,400
-12,800
| -22% | -$190K |
2020 Q4
23 quarters
|
|
3249
PUT
Mitsubishi UFJ Financial
MUFG
$245B
| $648K | ﹤0.01% |
28,100
+23,100
| +462% | +$521K |
2026 Q1
2 quarters
|
|
3250
CALL
Astrana Health
ASTH
$1.58B
| $647K | ﹤0.01% |
+18,200
| New | +$718K |
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.