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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 | |
|---|---|---|---|---|---|---|---|
3401
Alexandria Real Estate Equities
ARE
$7.72B
| $571K | ﹤0.01% |
12,021
-5,498
| -31% | -$279K |
2026 Q1
2 quarters
|
|
3402
Cypherpunk Technologies Inc
CYPH
$210M
| $570K | ﹤0.01% |
171,303
+166,876
| +3,770% | +$254K |
2024 Q3
8 quarters
|
|
3403
PUT
Tutor Perini Cor
TPC
$5.27B
| $569K | ﹤0.01% |
6,900
+1,000
| +17% | +$85.9K |
2018 Q2
33 quarters
|
|
3404
CALL
Weibo
WB
$1.5B
| $568K | ﹤0.01% |
88,000
+23,500
| +36% | +$172K |
2021 Q2
21 quarters
|
|
3405
CALL
Gerdau
GGB
$8.69B
| $568K | ﹤0.01% |
120,400
+81,800
| +212% | +$388K |
2025 Q4
3 quarters
|
|
3406
PUT
H&R Block
HRB
$6.17B
| $568K | ﹤0.01% |
13,900
-18,600
| -57% | -$847K |
2015 Q1
46 quarters
|
|
3407
PUT
Republic Services
RSG
$77.1B
| $567K | ﹤0.01% |
2,700
+300
| +13% | +$65.3K |
2019 Q3
28 quarters
|
|
3408
AMC Entertainment Holdings
AMC
$2.98B
| $566K | ﹤0.01% |
+188,820
| New | +$470K |
2026 Q3
0 quarters
|
|
3409
CALL
Lindblad Expeditions
LIND
$2.24B
| $566K | ﹤0.01% |
+18,000
| New | +$521K |
2026 Q3
0 quarters
|
|
3410
PennyMac Mortgage Investment
PMT
$631M
| $565K | ﹤0.01% |
71,757
-28,298
| -28% | -$268K |
2025 Q4
3 quarters
|
|
3411
CALL
Lazard
LAZ
$4.39B
| $565K | ﹤0.01% |
15,600
+5,500
| +54% | +$230K |
2015 Q1
46 quarters
|
|
3412
Viking Holdings
VIK
$39.7B
| $565K | ﹤0.01% |
7,214
+929
| +15% | +$87.4K |
2025 Q4
3 quarters
|
|
3413
PUT
Digi Power X Inc
DGXX
$224M
| $565K | ﹤0.01% |
137,800
-290,700
| -68% | -$1.16M |
2025 Q4
3 quarters
|
|
3414
CALL
CNX Resources
CNX
$5.2B
| $564K | ﹤0.01% |
18,100
-3,500
| -16% | -$121K |
2014 Q4
47 quarters
|
|
3415
PUT
GrabAGun Digital Holdings
PEW
$52.2M
| $563K | ﹤0.01% |
269,300
+4,200
| +2% | +$10.3K |
2025 Q3
4 quarters
|
|
3416
CALL
Bloomin' Brands
BLMN
$868M
| $563K | ﹤0.01% |
72,600
-900
| -1% | -$8.32K |
2018 Q1
34 quarters
|
|
3417
CALL
Ramaco Resources Class A
METC
$455M
| $562K | ﹤0.01% |
68,000
-57,700
| -46% | -$648K |
2021 Q4
19 quarters
|
|
3418
PUT
Stellantis
STLA
$11.2B
| $562K | ﹤0.01% |
128,900
-257,100
| -67% | -$1.38M |
2021 Q1
22 quarters
|
|
|
TUZ
3419
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $562K | ﹤0.01% |
10,600
+4,400
| +71% | +$233K |
2021 Q4
19 quarters
|
|
3420
PUT
MakeMyTrip
MMYT
$4.8B
| $562K | ﹤0.01% |
11,900
+11,700
| +5,850% | +$646K |
2026 Q1
2 quarters
|
|
3421
CALL
AppFolio
APPF
$7.9B
| $561K | ﹤0.01% |
2,800
+2,700
| +2,700% | +$536K |
2025 Q4
3 quarters
|
|
3422
PUT
DuPont de Nemours
DD
$20.5B
| $561K | ﹤0.01% |
8,200
-6,600
| -45% | -$898K |
2014 Q4
47 quarters
|
|
3423
PUT
EPR Properties
EPR
$4.51B
| $561K | ﹤0.01% |
10,000
+4,700
| +89% | +$282K |
2017 Q2
37 quarters
|
|
3424
PUT
ChargePoint
CHPT
$324M
| $560K | ﹤0.01% |
55,600
+2,800
| +5% | +$19.1K |
2020 Q4
23 quarters
|
|
3425
CALL
AMN Healthcare
AMN
$1.44B
| $560K | ﹤0.01% |
15,600
+10,400
| +200% | +$353K |
2015 Q2
45 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.