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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 | |
|---|---|---|---|---|---|---|---|
3751
Mercury Systems
MRCY
$4.94B
| $432K | ﹤0.01% |
5,203
+3,546
| +214% | +$343K |
2026 Q1
2 quarters
|
|
3752
PUT
Smith & Wesson
SWBI
$678M
| $432K | ﹤0.01% |
30,700
+27,300
| +803% | +$387K |
2015 Q4
43 quarters
|
|
3753
PUT
Kura Oncology
KURA
$682M
| $431K | ﹤0.01% |
40,200
+34,000
| +548% | +$380K |
2025 Q3
4 quarters
|
|
3754
CALL
International Seaways
INSW
$5.35B
| $430K | ﹤0.01% |
3,900
+3,000
| +333% | +$290K |
2020 Q1
26 quarters
|
|
3755
Petrobras
PBR
$118B
| $428K | ﹤0.01% |
+20,527
| New | +$390K |
2026 Q3
0 quarters
|
|
3756
PUT
Forward Industries Inc
FWDI
$400M
| $428K | ﹤0.01% |
54,900
+52,400
| +2,096% | +$284K |
2025 Q3
4 quarters
|
|
3757
PUT
Silvercorp Metals
SVM
$1.94B
| $428K | ﹤0.01% |
40,100
-38,300
| -49% | -$424K |
2020 Q4
23 quarters
|
|
3758
Teck Resources
TECK
$29.6B
| $428K | ﹤0.01% |
+6,501
| New | +$416K |
2026 Q3
0 quarters
|
|
3759
CALL
Corpay
CPAY
$29.6B
| $427K | ﹤0.01% |
1,100
+800
| +267% | +$313K |
2025 Q1
6 quarters
|
|
3760
Fidelity Solana Fund
FSOL
$104M
| $427K | ﹤0.01% |
30,901
+24,698
| +398% | +$261K |
2025 Q4
3 quarters
|
|
3761
Inter&Co
INTR
$1.88B
| $426K | ﹤0.01% |
79,771
+62,450
| +361% | +$342K |
2026 Q2
1 quarter
|
|
3762
PUT
Pershing Square
PS
$18B
| $425K | ﹤0.01% |
7,600
-3,400
| -31% | -$134K |
2026 Q2
1 quarter
|
|
3763
CALL
H&R Block
HRB
$6.09B
| $425K | ﹤0.01% |
10,400
-20,600
| -66% | -$938K |
2016 Q2
41 quarters
|
|
3764
CALL
NovaGold Resources
NG
$2.47B
| $424K | ﹤0.01% |
65,300
+27,900
| +75% | +$198K |
2017 Q2
37 quarters
|
|
3765
CALL
Eagle Nuclear Energy Corp
NUCL
$114M
| $424K | ﹤0.01% |
66,700
-5,400
| -7% | -$36.2K |
2026 Q2
1 quarter
|
|
3766
IDT Corp
IDT
$2.07B
| $423K | ﹤0.01% |
+5,291
| New | +$352K |
2026 Q3
0 quarters
|
|
3767
Insteel Industries
IIIN
$543M
| $423K | ﹤0.01% |
14,522
-4,535
| -24% | -$139K |
2026 Q1
2 quarters
|
|
3768
PUT
Xerox
XRX
$126M
| $423K | ﹤0.01% |
140,300
+87,600
| +166% | +$267K |
2021 Q2
21 quarters
|
|
3769
Pharvaris
PHVS
$2.35B
| $423K | ﹤0.01% |
13,332
+12,708
| +2,037% | +$445K |
2026 Q1
2 quarters
|
|
3770
PUT
Applied Aerospace & Defense Inc
AADX
$1.46B
| $422K | ﹤0.01% |
+35,100
| New | +$579K |
2026 Q3
0 quarters
|
|
3771
SunCoke Energy
SXC
$894M
| $422K | ﹤0.01% |
44,729
+7,753
| +21% | +$71.8K |
2025 Q1
6 quarters
|
|
3772
AGCO
AGCO
$7.74B
| $422K | ﹤0.01% |
3,690
+3,314
| +881% | +$378K |
2026 Q2
1 quarter
|
|
3773
CALL
Omega Healthcare
OHI
$14.3B
| $421K | ﹤0.01% |
9,100
-31,100
| -77% | -$1.49M |
2015 Q2
45 quarters
|
|
3774
CALL
ScottsMiracle-Gro
SMG
$3.74B
| $421K | ﹤0.01% |
8,400
+5,200
| +163% | +$321K |
2016 Q1
42 quarters
|
|
3775
PUT
Pool Corp
POOL
$7.73B
| $421K | ﹤0.01% |
2,600
-17,800
| -87% | -$3.37M |
2018 Q2
33 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.