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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 | |
|---|---|---|---|---|---|---|---|
2751
Amplify Junior Silver Miners ETF
SILJ
$3.14B
| $980K | ﹤0.01% |
35,919
-190,130
| -84% | -$5.37M |
2025 Q4
3 quarters
|
|
2752
PUT
MiniMed Group Inc
MMED
$5.13B
| $979K | ﹤0.01% |
50,300
+37,700
| +299% | +$724K |
2026 Q2
1 quarter
|
|
2753
PUT
Kaspi.kz JSC
KSPI
$17B
| $978K | ﹤0.01% |
10,400
+300
| +3% | +$28.7K |
2024 Q3
8 quarters
|
|
2754
Omega Healthcare
OHI
$14.6B
| $974K | ﹤0.01% |
21,033
+17,132
| +439% | +$821K |
2026 Q2
1 quarter
|
|
2755
Mattel
MAT
$4.59B
| $974K | ﹤0.01% |
76,923
+59,081
| +331% | +$838K |
2026 Q2
1 quarter
|
|
2756
CALL
Dimensional US Core Equity Market ETF
DFAU
$13B
| $973K | ﹤0.01% |
21,900
+16,800
| +329% | +$882K |
2024 Q2
9 quarters
|
|
2757
CALL
ResMed
RMD
$33.6B
| $973K | ﹤0.01% |
4,400
-3,000
| -41% | -$654K |
2017 Q4
35 quarters
|
|
2758
PUT
Fulcrum Therapeutics
FULC
$286M
| $973K | ﹤0.01% |
262,900
+171,000
| +186% | +$642K |
2025 Q4
3 quarters
|
|
2759
CALL
Cincinnati Financial
CINF
$29.1B
| $972K | ﹤0.01% |
6,100
+1,900
| +45% | +$331K |
2018 Q2
33 quarters
|
|
2760
CALL
Winnebago Industries
WGO
$898M
| $970K | ﹤0.01% |
36,800
-1,000
| -3% | -$30.1K |
2016 Q4
39 quarters
|
|
2761
United States Copper Index Fund
CPER
$706M
| $967K | ﹤0.01% |
24,319
-47,879
| -66% | -$1.88M |
2026 Q1
2 quarters
|
|
2762
PUT
Brown-Forman Class B
BF.B
$13.8B
| $967K | ﹤0.01% |
36,900
+19,900
| +117% | +$536K |
2023 Q4
11 quarters
|
|
2763
PUT
Algoma Steel
ASTL
$609M
| $967K | ﹤0.01% |
231,800
-70,400
| -23% | -$293K |
2022 Q2
17 quarters
|
|
2764
PUT
Global X S&P 500 Tail Risk ETF
XTR
$4.86M
| $965K | ﹤0.01% |
18,200
+12,400
| +214% | +$356K |
2022 Q3
16 quarters
|
|
2765
PUT
Ardelyx
ARDX
$787M
| $965K | ﹤0.01% |
282,200
+206,000
| +270% | +$884K |
2020 Q4
23 quarters
|
|
2766
Corpay
CPAY
$29.6B
| $965K | ﹤0.01% |
2,483
+1,297
| +109% | +$507K |
2026 Q2
1 quarter
|
|
2767
PUT
Galicia Financial Group
GGAL
$4.8B
| $965K | ﹤0.01% |
25,900
-6,400
| -20% | -$293K |
2026 Q1
2 quarters
|
|
2768
ServiceNow
NOW
$107B
| $963K | ﹤0.01% |
7,186
-284,622
| -98% | -$35M |
2025 Q1
6 quarters
|
|
2769
CCC Intelligent Solutions
CCC
$4.56B
| $963K | ﹤0.01% |
144,584
+49,104
| +51% | +$323K |
2026 Q1
2 quarters
|
|
2770
PUT
Cypherpunk Technologies Inc
CYPH
$216M
| $962K | ﹤0.01% |
288,900
+261,500
| +954% | +$398K |
2025 Q4
3 quarters
|
|
2771
PUT
Signet Jewelers
SIG
$4.62B
| $962K | ﹤0.01% |
9,400
+4,700
| +100% | +$429K |
2014 Q4
47 quarters
|
|
2772
Penumbra
PEN
$12.7B
| $962K | ﹤0.01% |
3,021
+1,178
| +64% | +$378K |
2025 Q4
3 quarters
|
|
2773
PUT
Liberty Global Class C
LBTYK
$3.47B
| $958K | ﹤0.01% |
105,100
+19,300
| +22% | +$196K |
2018 Q2
33 quarters
|
|
2774
PUT
Teucrium Corn Fund
CORN
$106M
| $958K | ﹤0.01% |
47,800
-21,500
| -31% | -$402K |
2025 Q4
3 quarters
|
|
2775
PUT
Bullish
BLSH
$3.57B
| $956K | ﹤0.01% |
27,400
+12,900
| +89% | +$375K |
2025 Q3
4 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.