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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 | |
|---|---|---|---|---|---|---|---|
4876
Landstar System
LSTR
$4.99B
| $161K | ﹤0.01% |
953
+890
| +1,413% | +$165K |
2025 Q4
3 quarters
|
|
4877
PUT
Casella Waste Systems
CWST
$6.38B
| $161K | ﹤0.01% |
+2,000
| New | +$183K |
2026 Q3
0 quarters
|
|
4878
Abivax
ABVX
$7.9B
| $160K | ﹤0.01% |
1,620
+20
| +1% | +$2.41K |
2025 Q4
3 quarters
|
|
4879
PUT
Verra Mobility
VRRM
$298M
| $160K | ﹤0.01% |
51,700
-27,200
| -34% | -$115K |
2026 Q2
1 quarter
|
|
4880
PUT
Church & Dwight Co
CHD
$26.4B
| $160K | ﹤0.01% |
1,700
+500
| +42% | +$49.1K |
2016 Q1
42 quarters
|
|
4881
CALL
Gloo Holdings Inc
GLOO
$273M
| $160K | ﹤0.01% |
+37,400
| New | +$134K |
2026 Q3
0 quarters
|
|
4882
PureCycle Technologies
PCT
$362M
| $160K | ﹤0.01% |
36,294
-129,534
| -78% | -$831K |
2026 Q1
2 quarters
|
|
4883
PUT
Leverage Shares 2X Long IREN Daily ETF
IREG
$3.22M
| $160K | ﹤0.01% |
6,900
+5,200
| +306% | +$44.9K |
2026 Q1
2 quarters
|
|
4884
PUT
Loar Holdings
LOAR
$7.03B
| $160K | ﹤0.01% |
2,600
+1,600
| +160% | +$113K |
2024 Q4
7 quarters
|
|
4885
PUT
Dorchester Minerals
DMLP
$1.43B
| $160K | ﹤0.01% |
5,700
+4,700
| +470% | +$131K |
2025 Q2
5 quarters
|
|
4886
Defiance Daily Target 2x Long MSTR ETF
MSTX
$187M
| $160K | ﹤0.01% |
8,737
+8,046
| +1,164% | +$96.4K |
2026 Q2
1 quarter
|
|
4887
CALL
Arbutus Biopharma
ABUS
$618M
| $160K | ﹤0.01% |
33,400
-3,200
| -9% | -$15.4K |
2021 Q2
21 quarters
|
|
4888
Antero Midstream
AM
$9.6B
| $159K | ﹤0.01% |
+7,905
| New | +$174K |
2026 Q3
0 quarters
|
|
4889
Adient
ADNT
$1.18B
| $159K | ﹤0.01% |
9,455
+5,293
| +127% | +$102K |
2025 Q2
5 quarters
|
|
4890
CALL
Pinnacle Financial Partners Inc
PNFP
$15B
| $159K | ﹤0.01% |
1,700
| – | – |
2026 Q1
2 quarters
|
|
4891
Ardmore Shipping
ASC
$777M
| $159K | ﹤0.01% |
+8,528
| New | +$147K |
2026 Q3
0 quarters
|
|
4892
PUT
Ralliant Corp
RAL
$7.82B
| $159K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$148K |
2025 Q4
3 quarters
|
|
4893
Nordic American Tanker
NAT
$1.42B
| $159K | ﹤0.01% |
20,090
-1,170
| -6% | -$7.96K |
2026 Q1
2 quarters
|
|
4894
CALL
Hyatt Hotels
H
$17.5B
| $159K | ﹤0.01% |
1,000
+500
| +100% | +$87.6K |
2018 Q1
34 quarters
|
|
|
4895
CALL
Abivax
ABVX
$7.9B
| $158K | ﹤0.01% |
1,600
-2,800
| -64% | -$338K |
2025 Q4
3 quarters
|
|
4896
Takeda Pharmaceutical
TAK
$67.5B
| $158K | ﹤0.01% |
+8,706
| New | +$154K |
2026 Q3
0 quarters
|
|
4897
PUT
Brown & Brown
BRO
$23.4B
| $158K | ﹤0.01% |
2,600
-1,900
| -42% | -$131K |
2024 Q4
7 quarters
|
|
4898
PUT
American Bitcoin Corp
ABTC
$368M
| $158K | ﹤0.01% |
18,600
-5,607
| -23% | -$41.7K |
2025 Q3
4 quarters
|
|
4899
BitGo Holdings
BTGO
$493M
| $158K | ﹤0.01% |
21,285
-4,793
| -18% | -$29.4K |
2026 Q1
2 quarters
|
|
4900
Ambiq Micro
AMBQ
$1.21B
| $157K | ﹤0.01% |
2,308
+2,161
| +1,470% | +$146K |
2026 Q1
2 quarters
|
|
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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.