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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 | |
|---|---|---|---|---|---|---|---|
2951
Harley-Davidson
HOG
$3.28B
| $834K | ﹤0.01% |
34,139
-21,224
| -38% | -$561K |
2024 Q4
7 quarters
|
|
2952
Vermilion Energy
VET
$1.65B
| $834K | ﹤0.01% |
+73,189
| New | +$839K |
2026 Q3
0 quarters
|
|
2953
PUT
Stifel
SF
$10.8B
| $833K | ﹤0.01% |
11,900
-4,200
| -26% | -$331K |
2026 Q2
1 quarter
|
|
2954
PUT
UroGen Pharma
URGN
$1.29B
| $833K | ﹤0.01% |
20,500
+6,500
| +46% | +$279K |
2023 Q3
12 quarters
|
|
2955
Comstock
LODE
$120M
| $833K | ﹤0.01% |
358,960
+42,916
| +14% | +$142K |
2024 Q3
8 quarters
|
|
2956
Halozyme
HALO
$11.5B
| $832K | ﹤0.01% |
+7,536
| New | +$728K |
2026 Q3
0 quarters
|
|
2957
State Street SPDR S&P Telecom ETF
XTL
$448M
| $832K | ﹤0.01% |
4,097
-1,182
| -22% | -$250K |
2026 Q2
1 quarter
|
|
2958
PUT
Alkermes
ALKS
$7.89B
| $831K | ﹤0.01% |
20,500
-46,600
| -69% | -$2.27M |
2021 Q2
21 quarters
|
|
2959
PUT
Acadia Healthcare
ACHC
$3.52B
| $830K | ﹤0.01% |
30,200
-2,800
| -8% | -$84.2K |
2026 Q1
2 quarters
|
|
2960
PUT
Western Midstream Partners
WES
$17.3B
| $830K | ﹤0.01% |
18,700
+2,400
| +15% | +$113K |
2026 Q1
2 quarters
|
|
2961
CALL
Vornado Realty Trust
VNO
$6.49B
| $827K | ﹤0.01% |
24,400
+6,300
| +35% | +$239K |
2016 Q2
41 quarters
|
|
2962
CALL
Hallador Energy
HNRG
$512M
| $827K | ﹤0.01% |
59,600
+37,300
| +167% | +$582K |
2023 Q4
11 quarters
|
|
2963
PUT
Yum China
YUMC
$16.6B
| $826K | ﹤0.01% |
20,100
-15,200
| -43% | -$675K |
2017 Q1
38 quarters
|
|
2964
CALL
Medline Inc
MDLN
$35.1B
| $826K | ﹤0.01% |
23,800
-58,500
| -71% | -$2.14M |
2025 Q4
3 quarters
|
|
2965
PUT
Xenon Pharmaceuticals
XENE
$4.03B
| $826K | ﹤0.01% |
22,200
+17,900
| +416% | +$1.06M |
2025 Q2
5 quarters
|
|
2966
AllianceBernstein
AB
$3.09B
| $824K | ﹤0.01% |
+23,618
| New | +$866K |
2026 Q3
0 quarters
|
|
2967
Vail Resorts
MTN
$5.4B
| $821K | ﹤0.01% |
5,987
-93
| -2% | -$13.4K |
2026 Q1
2 quarters
|
|
2968
PUT
Edwards Lifesciences
EW
$60.8B
| $820K | ﹤0.01% |
9,500
+5,800
| +157% | +$515K |
2021 Q1
22 quarters
|
|
2969
PUT
Travelers Companies
TRV
$82.6B
| $820K | ﹤0.01% |
2,300
-900
| -28% | -$330K |
2014 Q4
47 quarters
|
|
2970
PUT
LuxExperience B.V.
LUXE
$1.48B
| $820K | ﹤0.01% |
82,700
+82,600
| +82,600% | +$671K |
2023 Q3
12 quarters
|
|
2971
CALL
Gevo
GEVO
$460M
| $820K | ﹤0.01% |
623,200
-15,600
| -2% | -$24.2K |
2021 Q2
21 quarters
|
|
2972
PUT
Fluence Energy
FLNC
$679M
| $819K | ﹤0.01% |
106,700
-19,600
| -16% | -$238K |
2022 Q1
18 quarters
|
|
2973
AZZ Inc
AZZ
$4.02B
| $819K | ﹤0.01% |
6,097
-10,920
| -64% | -$1.57M |
2025 Q4
3 quarters
|
|
2974
GraniteShares 2x Long AMD Daily ETF
AMDL
$1.09B
| $819K | ﹤0.01% |
+10,353
| New | +$621K |
2026 Q3
0 quarters
|
|
2975
PUT
Western Alliance Bancorporation
WAL
$8B
| $819K | ﹤0.01% |
10,900
+3,400
| +45% | +$273K |
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.