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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 | |
|---|---|---|---|---|---|---|---|
2326
PUT
MSG Knickerbockers Corp.
MSGK
$7.78B
| $1.46M | ﹤0.01% |
3,600
+600
| +20% | +$238K |
2026 Q1
2 quarters
|
|
2327
CALL
Harley-Davidson
HOG
$3.43B
| $1.46M | ﹤0.01% |
59,700
+19,000
| +47% | +$502K |
2021 Q1
22 quarters
|
|
2328
PUT
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.75B
| $1.46M | ﹤0.01% |
57,200
+27,000
| +89% | +$558K |
2026 Q1
2 quarters
|
|
2329
PUT
Medline Inc
MDLN
$37B
| $1.46M | ﹤0.01% |
42,000
-2,800
| -6% | -$102K |
2025 Q4
3 quarters
|
|
2330
CALL
WeRide Inc
WRD
$1.46B
| $1.46M | ﹤0.01% |
274,400
-90,600
| -25% | -$528K |
2025 Q2
5 quarters
|
|
2331
Iron Mountain
IRM
$33.5B
| $1.46M | ﹤0.01% |
+13,127
| New | +$1.57M |
2026 Q3
0 quarters
|
|
2332
CALL
BioCryst Pharmaceuticals
BCRX
$1.97B
| $1.45M | ﹤0.01% |
174,300
-575,900
| -77% | -$5.42M |
2026 Q1
2 quarters
|
|
2333
CALL
Tradr 2X Long SPY Quarterly ETF
SPYQ
$12.7M
| $1.45M | ﹤0.01% |
88,700
+51,600
| +139% | +$9.9M |
2026 Q1
2 quarters
|
|
2334
CALL
National Energy Services Reunited Corp
NESR
$2.24B
| $1.45M | ﹤0.01% |
56,900
+41,800
| +277% | +$1.3M |
2026 Q1
2 quarters
|
|
2335
PUT
Sumitomo Mitsui Financial Group, Inc American Depositary Shares (each representing 1.2 shares of Common Stock)
SMFG
$155B
| $1.45M | ﹤0.01% |
+55,900
| New | +$1.45M |
2026 Q3
0 quarters
|
|
2336
PUT
Comstock Resources
CRK
$4.44B
| $1.45M | ﹤0.01% |
117,300
+99,800
| +570% | +$1.37M |
2016 Q3
40 quarters
|
|
2337
CALL
Banco Bradesco
BBD
$28.7B
| $1.44M | ﹤0.01% |
409,500
-4,000
| -1% | -$13.7K |
2015 Q2
45 quarters
|
|
2338
ProShares UltraShort Bloomberg Crude Oil
SCO
$931M
| $1.43M | ﹤0.01% |
72,262
+26,759
| +59% | +$685K |
2025 Q3
4 quarters
|
|
2339
PUT
JB Hunt Transport Services
JBHT
$21.2B
| $1.43M | ﹤0.01% |
6,400
-900
| -12% | -$241K |
2017 Q4
35 quarters
|
|
2340
CALL
Olin
OLN
$2.04B
| $1.43M | ﹤0.01% |
92,300
-57,400
| -38% | -$1.09M |
2021 Q2
21 quarters
|
|
2341
PUT
Tencent Music
TME
$15B
| $1.43M | ﹤0.01% |
180,200
-106,600
| -37% | -$927K |
2018 Q4
31 quarters
|
|
2342
UiPath
PATH
$6.85B
| $1.43M | ﹤0.01% |
111,288
-267,050
| -71% | -$3.71M |
2024 Q3
8 quarters
|
|
2343
PUT
BRC Group Holdings
RILY
$132M
| $1.43M | ﹤0.01% |
292,400
-24,400
| -8% | -$167K |
2018 Q4
31 quarters
|
|
2344
CALL
Icon
ICLR
$15B
| $1.43M | ﹤0.01% |
8,400
-3,600
| -30% | -$605K |
2018 Q3
32 quarters
|
|
2345
Repligen
RGEN
$11B
| $1.43M | ﹤0.01% |
7,427
-2,393
| -24% | -$389K |
2026 Q1
2 quarters
|
|
2346
iShares MBS ETF
MBB
$35.6B
| $1.43M | ﹤0.01% |
15,928
+15,014
| +1,643% | +$1.39M |
2026 Q2
1 quarter
|
|
2347
PUT
Kratos Defense & Security Solutions
KTOS
$6.91B
| $1.43M | ﹤0.01% |
33,400
-13,300
| -28% | -$678K |
2026 Q1
2 quarters
|
|
2348
CALL
Vizsla Silver
VZLA
$1.15B
| $1.43M | ﹤0.01% |
376,200
-254,700
| -40% | -$928K |
2025 Q3
4 quarters
|
|
2349
Agios Pharmaceuticals
AGIO
$1.96B
| $1.43M | ﹤0.01% |
+42,877
| New | +$1.5M |
2026 Q3
0 quarters
|
|
2350
TORM
TRMD
$3.63B
| $1.42M | ﹤0.01% |
+37,433
| New | +$1.18M |
2026 Q3
0 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.