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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 | |
|---|---|---|---|---|---|---|---|
4751
PUT
C4 Therapeutics
CCCC
$362M
| $177K | ﹤0.01% |
53,300
+36,000
| +208% | +$134K |
2026 Q2
1 quarter
|
|
4752
Canary XRP ETF
XRPC
$236M
| $177K | ﹤0.01% |
+11,242
| New | +$147K |
2026 Q3
0 quarters
|
|
4753
Roundhill Neocloud ETF
NCLD
| $177K | ﹤0.01% |
+7,526
| New | +$179K |
2026 Q3
0 quarters
|
|
4754
CALL
Prairie Operating Co
PROP
$47.7M
| $177K | ﹤0.01% |
430,600
-52,900
| -11% | -$33.2K |
2025 Q2
5 quarters
|
|
4755
CALL
HealthEquity
HQY
$8.56B
| $177K | ﹤0.01% |
2,000
+500
| +33% | +$49K |
2018 Q1
34 quarters
|
|
4756
PUT
Integer Holdings
ITGR
$4.31B
| $177K | ﹤0.01% |
1,400
-1,900
| -58% | -$220K |
2025 Q4
3 quarters
|
|
4757
CALL
Utz Brands
UTZ
$1.27B
| $177K | ﹤0.01% |
12,400
+2,500
| +25% | +$32.2K |
2020 Q3
24 quarters
|
|
4758
CALL
Geron
GERN
$623M
| $176K | ﹤0.01% |
143,400
+102,300
| +249% | +$147K |
2021 Q2
21 quarters
|
|
4759
CALL
Dianthus Therapeutics
DNTH
$5.17B
| $176K | ﹤0.01% |
2,000
+1,600
| +400% | +$166K |
2026 Q2
1 quarter
|
|
4760
YieldMax SMCI Option Income Strategy ETF
SMCY
$95.3M
| $176K | ﹤0.01% |
33,025
-5,170
| -14% | -$26K |
2024 Q4
7 quarters
|
|
4761
CALL
United States Gasoline Fund
UGA
$140M
| $176K | ﹤0.01% |
1,200
| – | – |
2017 Q2
37 quarters
|
|
4762
PUT
Abacus Global Management
ABX
$861M
| $176K | ﹤0.01% |
21,800
-4,200
| -16% | -$41.2K |
2024 Q4
7 quarters
|
|
4763
PACCAR
PCAR
$56.2B
| $176K | ﹤0.01% |
1,600
-1,392
| -47% | -$174K |
2026 Q1
2 quarters
|
|
4764
CALL
Immunovant
IMVT
$7.07B
| $176K | ﹤0.01% |
5,200
-2,000
| -28% | -$78.8K |
2021 Q1
22 quarters
|
|
4765
CALL
Phunware
PHUN
$35.8M
| $176K | ﹤0.01% |
88,700
-349,500
| -80% | -$728K |
2024 Q4
7 quarters
|
|
4766
PUT
NexPoint Residential Trust
NXRT
$396M
| $176K | ﹤0.01% |
+9,000
| New | +$220K |
2026 Q3
0 quarters
|
|
4767
Valvoline
VVV
$4.42B
| $175K | ﹤0.01% |
5,814
+5,245
| +922% | +$180K |
2026 Q1
2 quarters
|
|
4768
Opus Genetics
IRD
$385M
| $175K | ﹤0.01% |
36,204
+10,651
| +42% | +$44.2K |
2025 Q3
4 quarters
|
|
4769
PUT
Everspin Technologies
MRAM
$299M
| $175K | ﹤0.01% |
9,500
-41,800
| -81% | -$697K |
2026 Q1
2 quarters
|
|
4770
CALL
CCC Intelligent Solutions
CCC
$4.54B
| $175K | ﹤0.01% |
26,300
+14,000
| +114% | +$92.1K |
2026 Q1
2 quarters
|
|
4771
CALL
Stifel
SF
$10.9B
| $175K | ﹤0.01% |
2,500
-4,400
| -64% | -$347K |
2016 Q2
41 quarters
|
|
4772
CALL
United Parks & Resorts
PRKS
$1.82B
| $175K | ﹤0.01% |
5,400
-5,600
| -51% | -$236K |
2026 Q2
1 quarter
|
|
4773
CALL
Arlo Technologies
ARLO
$1.28B
| $175K | ﹤0.01% |
14,100
+12,000
| +571% | +$162K |
2018 Q3
32 quarters
|
|
4774
CALL
Kyverna Therapeutics
KYTX
$312M
| $175K | ﹤0.01% |
25,700
+10,200
| +66% | +$80.5K |
2025 Q2
5 quarters
|
|
4775
PUT
Allot
ALLT
$392M
| $175K | ﹤0.01% |
20,700
+500
| +2% | +$3.98K |
2018 Q4
31 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.