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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 | |
|---|---|---|---|---|---|---|---|
4726
PUT
Riskified
RSKD
$1.22B
| $182K | ﹤0.01% |
+23,000
| New | +$136K |
2026 Q3
0 quarters
|
|
4727
Scholar Rock
SRRK
$5.27B
| $182K | ﹤0.01% |
3,760
+2,295
| +157% | +$121K |
2026 Q2
1 quarter
|
|
4728
CALL
Invesco Mortgage Capital
IVR
$550M
| $181K | ﹤0.01% |
29,900
+8,100
| +37% | +$59.3K |
2026 Q1
2 quarters
|
|
4729
CALL
Power Integrations
POWI
$2.47B
| $181K | ﹤0.01% |
3,500
-25,400
| -88% | -$1.51M |
2021 Q2
21 quarters
|
|
4730
DELISTED
Arcosa
ACA
| $181K | ﹤0.01% |
1,240
+966
| +353% | +$140K |
2026 Q1
2 quarters
|
|
4731
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.23B
| $181K | ﹤0.01% |
3,400
-300
| -8% | -$17.8K |
2020 Q3
24 quarters
|
|
4732
PUT
American States Water
AWR
$3.52B
| $181K | ﹤0.01% |
2,200
+1,000
| +83% | +$86.6K |
2025 Q3
4 quarters
|
|
4733
PUT
Trane Technologies
TT
$91.5B
| $181K | ﹤0.01% |
400
-800
| -67% | -$368K |
2017 Q1
38 quarters
|
|
4734
Callaway Golf Company
CALY
$3.05B
| $180K | ﹤0.01% |
+12,793
| New | +$214K |
2026 Q3
0 quarters
|
|
4735
CALL
Innovative Solutions & Support
IA
$377M
| $180K | ﹤0.01% |
9,700
-11,300
| -54% | -$219K |
2026 Q1
2 quarters
|
|
4736
PUT
Jack in the Box
JACK
$283M
| $180K | ﹤0.01% |
13,600
-15,600
| -53% | -$244K |
2015 Q2
45 quarters
|
|
4737
CALL
Tango Therapeutics
TNGX
$4.32B
| $180K | ﹤0.01% |
7,200
+3,000
| +71% | +$78.1K |
2025 Q2
5 quarters
|
|
4738
PUT
KBR
KBR
$4.49B
| $179K | ﹤0.01% |
5,100
-26,600
| -84% | -$973K |
2023 Q1
14 quarters
|
|
4739
CALL
Maravai LifeSciences
MRVI
$1.13B
| $179K | ﹤0.01% |
23,400
+11,000
| +89% | +$76.1K |
2026 Q1
2 quarters
|
|
4740
CALL
Atlas Energy Solutions
AESI
$698M
| $179K | ﹤0.01% |
14,900
-23,300
| -61% | -$298K |
2023 Q3
12 quarters
|
|
4741
CALL
Ameren
AEE
$31.8B
| $179K | ﹤0.01% |
1,800
-6,600
| -79% | -$712K |
2018 Q2
33 quarters
|
|
4742
PUT
Corteva
CTVA
$6.29B
| $179K | ﹤0.01% |
2,300
-3,000
| -57% | -$248K |
2019 Q2
29 quarters
|
|
4743
Atea Pharmaceuticals
AVIR
$345M
| $178K | ﹤0.01% |
34,225
+31,292
| +1,067% | +$160K |
2025 Q2
5 quarters
|
|
4744
CALL
Tenax Therapeutics
TENX
$73.8M
| $178K | ﹤0.01% |
94,200
-53,300
| -36% | -$401K |
2026 Q2
1 quarter
|
|
4745
PUT
Okeanis Eco Tankers
ECO
$3.47B
| $178K | ﹤0.01% |
2,200
+600
| +38% | +$39.1K |
2026 Q2
1 quarter
|
|
4746
PUT
WisdomTree US Total Dividend Fund
DTD
$1.67B
| $178K | ﹤0.01% |
3,500
+2,700
| +338% | +$259K |
2014 Q4
47 quarters
|
|
4747
Neostellar Capital Corp
NSLR
$158M
| $178K | ﹤0.01% |
23,113
+21,191
| +1,103% | +$211K |
2026 Q2
1 quarter
|
|
4748
CALL
INNIO N.V.
INIO
$10.9B
| $178K | ﹤0.01% |
+9,800
| New | +$244K |
2026 Q3
0 quarters
|
|
4749
PUT
MBIA
MBI
$239M
| $178K | ﹤0.01% |
41,700
+8,500
| +26% | +$44.6K |
2025 Q3
4 quarters
|
|
4750
PUT
Outfront Media
OUT
$5.91B
| $178K | ﹤0.01% |
6,400
+5,900
| +1,180% | +$180K |
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.